tengku emrinaldi, muhammad adam dwiputra, ananta r. fareza, akrajas ali umar, ferry anggoro ardy nugroho, riski titian ginting, vivi fauzia.  (2024).  tuning surface wettability of mos2 to enhance solar-driven evaporation rates.  - environmental progress and sustainable energy.  1-10. 

marjoni imamora ali umar, annisa zahra ahdaliza, salah m. el-bahy, nur aliza, siti naqiyah sadikin, jaenudin ridwan, abang annuar ehsan, mohammed a. amin, zeinhom m. el-bahy, akrajas ali umar.  (2023).  optoelectrical properties of hexamine doped-methylammonium lead iodide perovskite under different grain-shape crystallinity.  - nanomaterials.  1-14. 

muhammad nurdin, la ode muhammad zuhdi mulkiyan, sri sugiwati, haznan abimayu, zaenal syam arifn, muryanto muryanto, maulidiyah maulidiyah, zul arham, la ode agus salim, irwan irwan, akrajas ali umar.  (2023).  productivity of aspergillus niger inacc f57 isolate as cellulase agent in opefb hydrolysis for glucose high yield.  - bionanoscience.  114-127. 

abdul rahman bin mohmad;akrajas bin ali umar;mohd ambri bin mohamed;rozan binti mohamad yunus.  (2023).  impact of niobium interstitials on structural properties and catalytic activity of metallic 2-dimensional niobium disulfide.  - .  . 

u.a. kamarulzaman, m.y.a. rahman, m.s. suait, a.a. umar.  (2023).  improvement of the performance of dye-sensitized solar cells employing nickelpalladium alloy-reduced graphene oxide counter electrode: influence of palladium content.  - optik.  1-9. 

muhammad nurdin, abdul haris watoni, muhammad natsir, sarifa rahmatilah, maulidiyah maulidiyah, dwiprayogo wibowo, la ode agus salim, siti naqiyah sadikin, catherina manukpadang bijang, akrajas ali umar.  (2023).  photoelectrocatalysis performance of se doped-tio2/ti nanotube arrays for visible-light-driven degradation of diazinon pesticide.  - korean journal of chemical engineering.  2209-2218. 

fatemeh behrouznejad, xiaoguo li, akrajas ali umar, xin zhang, rouhollah khosroshahi, siti khatijah md saad, irfan ahmed, nima taghavinia, yiqiang zhan.  (2023).  the fingerprint of charge transport mechanisms on the incident photon-to-current conversion efficiency spectra of perovskite solar cells.  - solar energy materials and solar cells.  1-8. 

n.a.s. aziz, m.y.a. rahman, a.a. umar, e. r. mawarnis.  (2023).  iridium-palladium binary alloy as a counter electrode in dye-sensitized solar cells.  - dalton transactions.  18354-18361. 

dahyunir dahlan, anla fet hardi, siti naqiyah sadikin, marjoni imamora ali umar, azrul azlan hamzah, vivi fauzia, jaenudin ridwan, maulidiyah maulidiyah, muhammad nurdin, akrajas ali umar.  (2023).  improving the optoelectrical properties of humid stable, hexamined perovskite lattice by phenetylammonium cation additive.  - optical materials.  1-8. 

n.a.s. aziz, m.y.a. rahman, a.a. umar, e.r. mawarnis.  (2023).  palladium films as cathode in dye-sensitized solar cell: influence of the concentration of potassium hexachloropalladate.  - applied physics a.  1-7. 

solihudin solihudin, haryono haryono, atiek rostika noviyanti, akrajas ali umar.  (2023).  effect of carbonization temperature of rice husk char preparation on sic structure and composition of by-products in sic synthesis with magnesiothermic reduction method.  - processes.  1-15. 

la ode agus salim, muhammad zakir muzakkar, ahmad zaeni, maulidiyah maulidiyah, muhammad nurdin, siti naqiyah sadikin, jaenuddin ridwan, akrajas ali umar.  (2023).  improved photoactivity of tio2 photoanode of dye-sensitized solar cells by sulfur doping.  - journal of physics and chemistry of solids.  1-6. 

iwan sugihartono, bambang soegijono, erfan handoko, tan swee tiam, akrajas ali umar.  (2023).  structure and optical properties of la-doped zno thin films at room temperature.  - processing and application of ceramics.  107-112. 

marjoni imamora ali umar, muhammad nurdin, atiek rostika noviyanti, dahyunir dahlan, ari sulistiyo rini, akrajas ali umar.  (2023).  highly-active surface reaction over ultra-thin (111) faceted gold nanoplates.  - journal of cluster science.  1721-1726. 

dwiprayogo wibowo, faizal mustapa, s. selviantori, muhammad idris, amir mahmud, maulidiyah maulidiyah, muh. zakir muzakkar, akrajas ali umar, muhammad nurdin.  (2023).  ca/peg/chitosan membrane incorporated with tio2 nanoparticles for strengthening and permselectivity membrane for reverse osmosis desalination.  - environmental nanotechnology, monitoring & management.  1-12. 

riyani tri yulianti, fredina destyorini, yuyun irmawati, slamet priyono, mohammad hamzah fauzi, akrajas ali umar, hiroshi uyama, vivi fauzia, rike yudianti.  (2023).  high capacitance performance of hierarchically sio2 self-doped porous activated carbon derived from palm empty fruit bunches.  - journal of energy storage.  1-12. 

muhammad nurdin, muhammad zakir muzakkar, maulidiyah maulidiyah, cici sumarni, thamrin azis, ratna ratna, muhammad natsir, irwan irwan, la ode agus salim, akrajas ali umar.  (2023).  highly active visible-light-driven photo-electrocatalytic process in tio2/ti electrode by te doping.  - journal of applied electrochemistry.  307-314. 

muhammad nurdin; ilham ilham; maulidiyah maulidiyah; muh. zakir muzakkar; dwiprayogo wibowo; zul arham; la ode agus salim; irwan irwan; catherina bijang; akrajas ali umar.  (2023).  enhanced photoelectrocatalytic performance using chalcogenide te/tio2/ ti nanotube array based on cod analyses for water treatment applications.  - electrocatalysis.  581-592. 

siti naqiyah sadikin, jaenudin ridwan, marjoni imamora ali umar, aini ayuni mohd raub, jumril yunas, azrul azlan hamzah, dahyunir dahlan, mohd yusri abd rahman, akrajas ali umar.  (2023).  photocatalytic activity and stability properties of porous tio2 film as photocatalyst for methylene blue and methylene orange degradation.  - international journal of electrochemical science.  1-8. 

u.a. kamarulzaman, m.y.a. rahman, m.s. suait, a.a. umar.  (2023).  dye-sensitized solar cells using nickelpalladium alloy-reduced graphene oxide cathode: effect of deposition temperature.  - chemical papers.  4625-4632. 

setia budi, mari takahashi, mega gladiani sutrisno, wisnu ari adi, zahra fairuza, budhy kurniawan, shinya maenosono, akrajas ali umar.  (2023).  phases evolution and photocatalytic activity of cu2o films electrodeposited from a non-ph-adjusted solution.  - royal society open science.  1-14. 

nabilah alias, akrajas ali umar, siti naqiyah sadikin, jaenudin ridwan, azrul azlan hamzah, marjoni imamora ali umar, abang annuar ehsan, muhammad nurdin, yiqiang zhan.  (2023).  air-processable perovskite solar cells by hexamine molecule phase stabilization.  - acs omega.  18874-18881. 

muhammad nurdin, dwiprayogo wibowo, thamrin azis, rezki ayu safitri, maulidiyah maulidiyah, amir mahmud, faizal mustapa, ruslan ruslan, la ode agus salim, zul arham, akrajas ali umar.  (2022).  photoelectrocatalysis response with synthetic mn-n-tio2/ti electrode for removal of rhodamine b dye.  - surface engineering and applied electrochemistry.  125-134. 

marjoni imamora ali umar, setia budi, muhammad nurdin, akrajas ali umar.  (2022).  synthesis of standing zno nanosheets and impact of ag nanoparticles loading on its optical property.  - bulletin of materials science.  1-6. 

a y a al-she'irey, m y a rahman, m i a umar, i sugihartono, v fauzia, a a umar.  (2022).  effect of potassium precursor concentration on the performance of perovskite-sensitized solar cells.  - bulletin of materials science.  1-9. 

muhammad nurdin, muhammad zakir muzakkar, maulidiyah maulidiyah, trisna trisna, zul arham, la ode agus salim, irwan irwan, akrajas ali umar.  (2022).  high-performance cod detection of organic compound pollutants using sulfurized-tio2/ti nanotube array photoelectrocatalyst.  - electrocatalysis.  580-589. 

j. ridwan, j. yunas, a.a. umar, a.a. mohd raub, a.a. hamzah, j. kazmi a.b.d. nandiyanto, r.e. pawinanto, i. hamidah.  (2022).  vertically aligned cu-doped zno nanorods for photocatalytic activity enhancement.  - international journal of electrochemical science.  1-18. 

muhammad nurdin, zul arham, wa ode irna, maulidiyah maulidiyah, kurniawan kurniawan, la ode agus salim, irwan irwan, akrajas ali umar.  (2022).  enhanced-charge transfer over molecularly imprinted polyaniline modified graphene/tio2 nanocomposite electrode for highly selective detection of fipronil insecticide.  - materials science in semiconductors processing.  1-10. 

mohd mustaqim rosli, tengku hasnan tengku abdul aziz, majoni imamora ali umar, muhammad nurdin, akrajas ali umar.  (2022).  propylene glycol directed synthesis of silver nanowires for transparent conducting electrode application.  - journal of electronic materials.  5150-5158. 

dwiprayogo wibowo, muh. zakir muzakkar, maulidiyah maulidiyah, muhammad nurdin, siti khatijah md saad, akrajas ali umar.  (2022).  morphological analysis of ag doped on tio2/ti prepared via anodizing and thermal oxidation methods.  - biointerface research in applied chemistry.  1421-1427. 

n.a.s. aziz, m.y.a. rahman, a.a. umar.  (2022).  comparative study of dye-sensitized solar cell utilizing selenium and palladium cathode.  - journal of the indian chemical society.  1-5. 

m.y.a. rahman, s.n. sadikin, a.a. umar.  (2022).  dye-sensitized solar cells using zinc sulphide-coated titanium dioxide films as photoanode: effect of immersion temperature on its performan.  - international journal of electrochemical science.  1-11. 

a.y.a. al-she'irey, m.y.a. rahman, a.a. umar.  (2022).  perovskite-sensitized solar cell utilizing tio2 nanograss: effect of dipping time of ch3nh3pbi3 perovskite.  - journal of the indian chemical society.  1-5. 

elvy rahmi mawarnis, salah m. el-bahy, altaf yahya ahmed al-she'irey, liszulfah roza, islam h. el azab, gaber a.m. mersal, zeinhom m. el-bahy, mohamed m. ibrahim, akrajas ali umar.  (2022).  crystal growth and catalytic properties of agpt and aupt bimetallic nanostructures under surfactant effect.  - inorganic chemistry communications.  1-9. 

muhammad nurdin, maulidiyah maulidiyah, abdul haris watoni, armawansa armawansa, la ode agus salim, zul arham, dwiprayogo wibowo, irwan irwan, akrajas ali umar.  (2022).  nanocomposite design of graphene modified tio2 for electrochemical sensing in phenol detection.  - korean journal of chemical engineering.  209-215. 

muhammad nurdin, muhammad zakir muzakkar, maulidiyah maulidiyah, trisna trisna, zul arham, la ode agus salim, irwan irwan, akrajas ali umar.  (2022).  high-performance cod detection of organic compound pollutants using sulfurized-tio2/ti nanotube array photoelectrocatalyst.  - electrocatalysis.  580-589. 

siti naqiyah sadikin, marjoni imamora ali umar, azrul azlan hamzah, muhammad nurdin, akrajas ali umar.  (2022).  formation of ultimate thin 2d crystal of pt in the presence of hexamethylenetetramine.  - international journal of molecular sciences.  1-9. 

akrajas ali umar, nurul ain abd malek, nabilah alias, abang anuar ehsan.  (2022).  chalcogenides-preparation and applications.  - .  20. 

dilla duryha binti berhanuddin;norhana binti arsad;akrajas bin ali umar;ahmad rifqi bin md zain.  (2022).  the development of silicon based light-emitting device using hybrid optically active point-defect and photonic crystal (phc) techniques.  - .  . 

dilla duryha binti berhanuddin;burhanuddin bin yeop majlis;akrajas bin ali umar;abdul rahman bin mohmad;rozan binti mohamad yunus.  (2022).  high intensity photoluminescence from structural manipulation of hybrid 2d materials and silicon structure for the development of light-emitting device at telecommunication wavelength .  - .  . 

akrajas bin ali umar;abdul rahman bin mohmad;mohd yusri bin abd rahman.  (2022).  ultimate thin tio2-tis2 hybrid nanosheet for high performance perovskite solar cells.  - .  . 

mohd yusri bin abd rahman;akrajas bin ali umar;mohd sukor bin su`ait.  (2022).  nickelpalladium alloy-reduced graphene oxide composite as counter electrode of dye-sensitized solar cells.  - .  . 

dahyunir dahlan, marjoni imamora ali umar, siti naqiyah sadikin, jaenudin ridwan, akrajas ali umar.  (2022).  photoelectrical process uplift in mg-doped-tio2 photoanode of dye-sensitized solar cells.  - optical materials.  1-8. 

setia budi, wisnu ari adi, yusmaniar, zahra fairuza, imam basori, akrajas ali umar.  (2022).  structural analysis of nanocrystalline cu2o prepared by electrodeposition at different temperatures.  - international journal of electrochemical sciences.  1-12. 

n.a.s. aziz, m.y.a. rahman, a.a. umar.  (2022).  palladium selenide as cathode for dye-sensitized solar cell: effect of palladium content.  - solid-state electronics.  1-5. 

muliadi muliadi, muhammad nurdin, akrajas ali umar.  (2022).  synthesis of photoluminescent europium dithiocarbamate complexes with dimethyl phenanthroline and bipyridyl co-ligands.  - optical materials.  1-8. 

mohd yusri bin abd rahman;akrajas bin ali umar.  (2021).  nickel sulfide-reduced graphene oxide composite film as counter electrode in dye-sensitized solar cell.  - .  . 

u.a. kamarulzaman, m.y.a. rahman, m.s. suait, a.a. umar.  (2021).  nickelpalladium alloy-reduced graphene oxide as counter electrode for dye-sensitized solar cells.  - journal of molecular liquids.  1-7. 

muhamad adam ramli, elvy rahmi mawarnis, marjoni imamora ali umar, mohd yusri abd rahman, vivi fauzia, muhammad nurdin, akrajas ali umar.  (2021).  charge transfer uplift in dye-sensitized solar cells using fibrous nanocrystals of platinum-based bimetallic counter electrodes.  - surface and interfaces.  1-12. 

ummi kalsom noor din, muhamad mat salleh, tengku hasnan tengku aziz, ahmad rifqi md zain, mohd. ambri mohamed, akrajas ali umar.  (2021).  on the performance of polymer-inorganic perovskite oxide composite light-emitting diodes: the effect of perovskite srtio3 additives.  - nanomaterials and nanotechnology.  1-9. 

abdul rahman bin mohmad;azrul azlan bin hamzah;tengku hasnan bin tengku abdul aziz;akrajas bin ali umar.  (2021).  metallic 2-dimensional 1t mos2 as electrode material for supercapacitors.  - .  . 

marjoni imamora ali umar, dahyunir dahlan, muhammad nurdin, munetaka oyama, akrajas ali umar.  (2021).  two-dimensional crystal growth in zno nanostructures directed by poly vinylpyrrolidone.  - materials letters.  1-4. 

jaenudin ridwan, jumril yunas, akrajas ali umar, aini ayunni mohd raub.  (2021).  hydrothermal grow of cu doped zno nanorods for large spectrum photocatalyst.  - 2021 ieee regional symposium on micro and nanoelectronics (rsm).  108-111. 

marjoni imamora ali umar, akrajas ali umar.  (2021).  synthesis of large-scale cadmium oxide nanowires from an aqueous solution.  - journal of electronic materials.  5553-5556. 

akrajas ali umar.  (2021).  fixing the interface for enhanced perovskite solar cell performance.  - research outreach.  1-4. 

nabilah alias, akrajas ali umar,* nurul ain abd malek, kai liu, xiaoguo li, nur adliha abdullah, mohd mustaqim rosli, mohd yusri abd rahman, zejiao shi, xin zhang, haijuan zhang, fengcai liu, jiao wang, yiqiang zhan.  (2021).  photoelectrical dynamics uplift in perovskite solar cells by atoms thick 2d tis2 layer passivation of tio2 nanograss electron transport layer.  - acs applied materials and interfaces.  3051-3061. 

anita eka putri, liszulfah roza, setia budi, akrajas ali umar, vivi fauzia.  (2021).  tuning the photocatalytic activity of nanocomposite zno nanorods by shape-controlling the bimetallic auag nanoparticles.  - applied surface science.  14784. 

tengku hasnan bin tengku abdul aziz;akrajas bin ali umar.  (2021).  reduced graphene oxide as electron buffer layer for organic light emitting diodes (oleds).  - .  . 

akrajas bin ali umar;tengku hasnan bin tengku abdul aziz;mohd yusri bin abd rahman;mohd ambri bin mohamed.  (2021).  investigation of the role of atomic stoichiometry in moxwycu1-x-yx2 (x=s and se) nanosheets on their optoelectronic properties for high performance solar cells.  - .  . 

p. susthitha menon a/p n v visvanathan;akrajas bin ali umar;dilla duryha binti berhanuddin.  (2020).  multi-parametric graphene-based spr biosensor utilizing kretschmann-based technique.  - .  . 

akrajas bin ali umar;tengku hasnan bin tengku abdul aziz;mohd yusri bin abd rahman.  (2020).  high performance organometal halide perovskite solar cells utilizing high-surface energy (001) faceted anatase tio2 nanosheets.  - .  . 

ali muhammad mahar, aamna balouch, farah naz talpur, abdullah, pirah panah, raj kumar, ameet kumar, abdul hameed pato, dadu mal, sagar kumar, akrajas ali umar.  (2020).  fabrication of pt-pd@ito grown heterogeneous nanocatalyst as efficient remediator for toxic methyl parathion in aqueous media.  - environmental science and pollution research.  9970-9978. 

ari sulistyo rini, yolanda rati, akrajas ali umar, nur adliha abdullah.  (2020).  investigation of structural, morphological and optical properties of sulfur doped zinc oxide nanorod.  - international journal of nanoelectronics and materials.  21-32. 

ari sulistyo rini, yolanda rati, miranti agustin, yanuar hamzah, akrajas ali umar.  (2020).  seed-mediated synthesis and photoelectric properties of selenium doped zinc oxide nanorods.  - sains malaysiana.  3055-3063. 

ummi aqilah kamarulzaman, mohd yusri abd rahman, mohd sukor suait, akrajas ali umar.  (2020).  dye-sensitized solar cell utilizing nipd-rgo counter electrode: comparative study of deposition technique and effect of nicl2 concentration on its performance.  - international journal of nanoelectronics and materials.  159-164. 

dahyunir dahlan, nabilah alias, siti khatijah md saad, andhika dwipanur priya utama, muhamad adam ramli, nurul ain abd malek, mohd mustaqim rosli, nur adliha abdullah, akrajas ali umar.  (2020).  photoelectrical properties of anatase tio2 with diferent morphologies under au plasmonic effect.  - applied physics a.  1-10. 

ari sulistyo rini, mahagi p. deraf, h. yanuar, a.a. umar.  (2020).  liquid phase deposition of tio2 films for electron transport layer of perovskite solar cells.  - j. nano- and electronics physics.  30191-30195. 

n. mustaffa, m.y.a. rahman, a.a. umar.  (2020).  dye-sensitized solar cell utilizing silver doped reduced graphene oxide: influence of annealing temperature on its performance.  - arabian journal of chemistry.  3383-3390. 

nurul ain abd malek, nabilah alias, akrajas ali umar, xin zhang, xiaoguo li, siti khatijah md saad, nur adliha abdullah, haijuan zhang, zhenhua weng, zejiao shi, chongyuan li, mohd mustaqim rosli, yiqiang zhan.  (2020).  enhanced charge transfer in atom-thick 2h-ws2 nanosheets' electron transport layers of perovskite solar cells.  - solar rrl.  1-11. 

s.n. sadikin, m.y.a. rahman, a.a. umar.  (2020).  influence of annealing temperature of tio2-coated zns films on the performance of dye-sensitized solar cells.  - optik.  1-9. 

akrajas ali umar, xin zhang, siti khatijah md saad, nurul ain abd malek, kai liu, nabilah alias, nur adliha abdullah, xiaoguo li, fengcai liu, zejiao shi, haijuan zhang, chongyuan li, zhenhua weng, yiting liu, yuyi zhang, xiaolei zhan, jiao wang, y. zhan.  (2020).  enhancing the interfacial carrier dynamic in perovskite solar cells with an ultra-thin single-crystalline nanograss-like tio2 electron transport layer.  - journal of materials chemistry a.  13820-13831. 

marjoni imamora ali umar, resti, venny haris, akrajas ali umar.  (2020).  the influence of mose2 coated onto pt film to dssc performance with the structure tio2/dye/lxmose2pt (0
x
5).  - materials letters.  1-4. 

u.a. kamarulzaman, m.y.a. rahman, m.s. suait, a.a. umar.  (2020).  effect of annealing treatment on multi-layers tio2 films on the performance of dye-sensitized solar cells.  - optik.  1-10. 

dwiprayogo wibowo, muh. zakir muzakkar, sitti khadijah md saad, faizal mustapa, maulidiyah maulidiyah, muhammad nurdin, akrajas ali umar.  (2020).  enhanced visible light-driven photocatalytic degradation supported by autio2 coral-needle nanoparticles.  - journal of photochemistry and photobiology a.  1-8. 

mohd mustaqim rosli, tengku hasnan tengku abdul aziz, ahmad rifqi md zain, nabilah alias, nurul ain abd malek, nur adliha abdullah, siti khatijah md saad, akrajas ali umar.  (2020).  micro-strain effect on electronic properties in graphene induced by silver nanowires.  - physica e: low-dimensional systems and nanost.  1-6. 

rahmat setiawan mohar, iwan sugihartono, vivi fauzia, akrajas ali umar.  (2020).  dependence of optical properties of mg-doped zno nanorods on al dopant.  - surface and interfaces.  1-6. 

muhammad zakir muzakkar, muhammad nurdin, ima ismail, maulidiyah maulidiyah, dwiprayogo wibowo, ratna ratna, siti khatijah md saad, akrajas ali umar.  (2020).  tio2 coated-asphalt buton photocatalyst for high-performance motor vehicles gas emission mitigation.  - emission control science and technology.  28-36. 

siti khatijah md saad, nabilah alias, muhamad adam ramli, nur adliha abdullah, nurul ain abd malek, mohd mustaqim rosli and akrajas ali umar.  (2020).  a two-dimensional crystal growth in anatase titania nanostructures driven by trigonal hydronium ions.  - rsc advances.  16886-16891. 

nurul ain abd malek, nabilah alias, siti khatijah md saad, nur adliha abdullah, xin zhang, xiaoguo li, zejiao shi, mohd mustaqim rosli, tengku hasnan tengku abd aziz, akrajas ali umar, yiqiang zhan.  (2020).  ultra-thin mos2 nanosheet for electron transport layer of perovskite solar cells.  - optical materials.  1-8. 

mohd yusri bin abd rahman;muhamad bin mat salleh;akrajas bin ali umar.  (2019).  barium titanate (batio3) doped titanium dioxide (tio2) films as photoanode for dye-sensitized solar cell (dssc).  - .  1-5. 

dahyunir dahlan, muhamad adam ramli, khudbatul fiqrian, siti khatijah md saad, munetaka oyama, akrajas ali umar.  (2019).  thermal impact on (001) faceted anatase tio2 microtablets and nanowalls's lattices and its effect on the photon to current conversion efficiency.  - journal of physics and chemistry of solids.  . 

s.n. sadikin, m.y.a. rahman, a.a. umar.  (2019).  zinc sulphide-coated titanium dioxide films as photoanode for dye-sensitized solar cells: effect of immersion time on its performance.  - superlattices and microstructures.  153-159. 

iwantono iwantono, siti khatijah md saad, fera anggelina, awitdrus awitdrus, muhamad adam ramli, akrajas ali umar.  (2019).  enhanced charge transfer activity in au nanoparticles decorated zno nanorods photoanode.  - physica e: low-dimensional systems and nanostructures.  44-50. 

zhenhua weng, jiajun qin, akrajas ali umar, jiao wang, xin zhang, haoliang wang, xiaolei cui, xiaoguo li, lirong zheng, yiqiang zhan.  (2019).  lead-free cs2biagbr6 double perovskite-based humidity sensor with superfast recovery time.  - advanced functional materials.  1-9. 

muhammad nurdin, owink agung prabowo, zul arham, dwiprayogo wibowo, maulidiyah maulidiyah, siti khatijah md saad, akrajas ali umar.  (2019).  highly sensitive fipronil pesticide detection on ilmenite (feo.tio2)-carbon paste composite electrode.  - surfaces and interfaces.  108-113. 

muhammad nurdin, maulidiyah maulidiyah, la ode agus salim, muhammad zakir muzakkar, akrajas ali umar.  (2019).  high performance cypermethrin pesticide detection using anatase tio2-carbon paste nanocomposites electrode.  - microchemical journal.  . 

a.s. sulaiman, m.y.a. rahman, a.a. umar.  (2019).  dye-sensitized solar cell utilizing gold doped reduced graphene oxide: a brief current progress.  - international journal of electroactive materials.  21-27. 

norhayati abu bakar, nur adliha abdullah, akrajas ali umar, muhamad mat salleh, joseph george shapter.  (2019).  effect of silver concentration towards formation of agpt nanofern films as sers substrates.  - fourth international conference on science and technology (materials science forum).  231-236. 

dee chang fu;muhamad bin mat salleh;burhanuddin bin yeop majlis;azrul azlan bin hamzah;akrajas bin ali umar.  (2019).  study on the sensing properties on albumin protein by nanowire based sensing arrays.  - .  1-5. 

norhayati binti abu bakar;akrajas bin ali umar;abdul rahman bin mohmad;norhayati binti abu bakar.  (2019).  building surface enhanced raman spectroscopy (sers) based biosensors.  - .  . 

m.y.a. rahman, s.a.m. samsuri, a.a. umar.  (2019).  tio2-srtio3 composite photoanode: effect of strontium precursor concentration on the performance of dssc.  - applied physics a-materials science & processing.  1-11. 

m.y.a. rahman, s.a.m. samsuri, a.a. umar.  (2019).  dye-sensitized solar cell utilizing tio2-sulphur composite photoanodes, influence of sulphur precursor content.  - sn applied sciences.  . 

muhammad nurdin, la agusu, abdul azis marzuki putra, maulidiyah maulidiyaha, zul arham, dwiprayogo wibowo, muhammad zakir muzakkar, akrajas ali umar.  (2019).  synthesis and electrochemical performance of graphene-tio2-carbon paste nanocomposites electrode in phenol detection.  - journal of physics and chemistry of solids.  104-110. 

elvy rahmi mawarnis, akrajas ali umar.  (2019).  fibrous bimetallic silver palladium and ruthenium palladium nanocrystals exhibit an exceptionally high active catalytic process in acetone hydrogenation.  - materials today chemistry.  1-9. 

s.n. sadikin, m.y.a. rahman, a.a. umar, t.h.t. aziz.  (2019).  improvement of dye-sensitized solar cell performance by utilizing tio2 coated graphene films photoanode.  - superlattices and microstructures.  92-98. 

n. mustaffa. m. y. a. rahman. a. a. umar.  (2019).  dye-sensitized solar cell utili zing silver-doped reduced graphene oxide films counter electrode: influence of annealing temperature on its performance.  - the 4th malaysia-japan joint symposium on nanoelectronics 2019.  1-5. 

norhayati abu bakar, akrajas ali umar, muhamad mat salleh.  (2019).  reka bentuk sensor pendar cahaya bintik kuantum zncdse untuk mengesan racun perosak.  - sains malaysiana.  1513-1518. 

muhamad adam ramli, siti khatijah md saad, elvy rahmi mawarnis, marjoni imamora ali umar, p. susthitha menon, mohd yusri abd rahman, akrajas ali umar.  (2019).  facile charge transfer in fibrous pdpt bimetallic nanocube counter electrodes.  - new journal of chemistry.  11148-11156. 

vivi fauzia, devi irmavianti, liszulfah roza, mas ayu elita hafizah, cuk imawan, akrajas ali umar.  (2019).  bimetallic auag sharp-branch mesoflowers as catalyst for hydrogenation of acetone.  - materials chemistry and physics.  443-450. 

p. susthitha menon, fairus atida said, gan siew mei, dilla duryha berhanuddin, akrajas ali umar, sahbudin shaari, burhanuddin yeop majlis.  (2018).  urea and creatinine detection on nano-laminated gold thin film using kretschmann-based surface plasmon resonance biosensor.  - plos one.  . 

noor far'ain md noor, muhammad ashraf saiful badri, muhamad mat salleh & akrajas ali umar.  (2018).  synthesis of white fluorescent pyrrolic nitrogen-doped graphene quantum dots.  - optical materials.  . 

a.s. sulaiman, m.y.a. rahman & a.a. umar.  (2018).  gold doped reduced graphene oxide as counter electrode in dye-sensitized solar cell.  - imen postgraduate colloquium 2018.  . 

s.n. sadikin, m.y.a. rahman & a.a. umar.  (2018).  tio2-zns and tio2-graphene films as photoanodes in dye-sensitized solar cell (dssc).  - .  . 

s.n. sadikin, m.y.a. rahman, a.a. umar.  (2018).  dye-sensitized solar cell utilizing tio2-nis composite photoanode: effect of nickel nitrate content on its performance.  - international journal of electroactive materials.  . 

m.y.a. rahman, s.n. sadikin, a.a. umar.  (2018).  tio2-coated zns films as photoanode for dye-sensitized solar cell: effect of zinc nitrate hexahydrate concentration on the performance.  - applied physics a: materials science and processing.  . 

marjoni imamora ali umar, fitri yenni naumar, muhamad mat salleh & akrajas ali umar.  (2018).  hydrothermally grown of well-aligned znonrs: dependence of alignment ordering upon precursor concentration.  - journal of materials sciences: materials in electronics.  . 

akrajas ali umar, altaf yahya ahmed al-she'irey, mohd yusri abd rahman, muhamad mat salleh, munetaka oyama.  (2018).  perovskite-sensitized solar cells-based ga-tio2 nanodiatom-like photoanode: the improvement of performance by perovskite crystallinity refinement.  - applied physics a: materials science and processing.  . 

m.y.a. rahman, a.s. sulaiman, a.a. umar.  (2018).  effect of annealing temperature of gold doped reduced graphene oxide counter electrode on the performance of dye-sensitized solar cell.  - international journal of electrochemical science.  . 

m.y.a. rahman, a.s. sulaiman, a.a. umar.  (2018).  dye-sensitized solar cell utilizing gold doped reduced graphene oxide films counter electrode.  - journal of new materials for electrochemical systems.  . 

md saad, s.k., ali umar, a., ali umar, m.i., tomitori, m., abd rahman, m.y., mat salleh, m., oyama, m..  (2018).  two-dimensional, hierarchical ag-doped tio2 nanocatalysts: effect of the metal oxidation state on the photocatalytic properties.  - acs omega.  . 

norhayati abu bakar, muhamad mat salleh, akrajas ali umar and joseph george shapter.  (2018).  effect of surface density silver nanoplate films toward surface-enhanced raman scattering enhancement for bisphenol a detection.  - journal of physics: conference series (3rd international symposium on frontier of applied physics, isfap 2017).  . 

norhayati abu bakar, nur adliha abdullah, muhamad mat salleh, akrajas ali umar and joseph george shapter.  (2018).  optimum growth time in agpt nanofern preparation for enhancement of surface-enhanced raman scattering intensity.  - advances in natural sciences: nanoscience and nanotechnology.  . 

rosli, m.m., salleh, m.m., umar, a.a.& aziz t.h.t.  (2018).  silver nanowires prepared by one-pot polyol method as transparent conducting thin film electrodes.  - the 9th international workshop on advanced materials science & nanotechnology.  . 

n. mustaffa, m.y.a. rahman, a.a. umar.  (2018).  dye-sensitized solar cell utilizing silver doped reduced graphene oxide: fffect of silver nitrate content on its performance.  - ionics.  . 

iwantono iwantono, siti khatijah md saad, rischi yuda, mohd yusri abd rahman, akrajas ali umar.  (2018).  structural and properties transformation in zno hexagonal nanorod by ruthenium doping and its effect on dsscs power conversion efficiency.  - superlattices and microstructures.  . 

elvy rahmi mawarnis, akrajas ali umar, masahiko tomitori, aamna balouch, muhammad nurdin, muhammad zakir muzakkar, munetaka oyama.  (2018).  hierarchical bimetallic agpt nanoferns as high-performance catalysts for selective acetone hydrogenation to isopropanol.  - acs omega.  . 

a.s. sulaiman, m.y.a. rahman, a.a. umar, m.m. salleh.  (2018).  dye-sensitized solar cell (dssc) utilizing tio2 nanostructure films: effect of synthesis temperature.  - russian journal of electrochemistry.  56-61. 

nur ajrina putri, vivi fauzia, s. iwan, liszulfah roza, akrajas ali umar, setia budi.  (2018).  mn-doping-induced photocatalytic activity enhancement of zno nanorods prepared on glass substrates.  - applied surface science.  285-297. 

m.y.a. rahman, l. roza, s.a.m. samsuri, a.a. umar.  (2018).  effect of n719 dye dipping temperature on the performance of dye-sensitized solar cell.  - russian journal of electrochemistry.  . 

akrajas bin ali umar;muhamad bin mat salleh;mohd yusri bin abd rahman.  (2018).  engineering the two-dimensional hexagonal honeycomb crystal of noble metal chalcogenide for high-performance optoelectronic materials..  - .  . 

liszulfah roza, i. iwantono, gusyeri andika, akrajas ali umar, mohd. yusri. abd rahman.  (2018).  effect of hexamethylenetetramine (hmt) concentration on the properties of boron doped zno nanotubes array films and the performance of dye-sensitized solar cell (dssc).  - international conference on engineering and technology (intcet 2017).  . 

akrajas ali umar,siti khatijah md saad, marjoni imamora ali umar, mohd yusri abd rahman, munetaka oyama.  (2018).  advances in porous and high-energy (001)-faceted anatase tio2 nanostructures.  - optical materials.  390-430. 

m.y.a. rahman, a.s. sulaiman, a.a. umar.  (2018).  dye-sensitized solar cell utilising gold doped reduced graphene oxide counter electrode: influence of annealing time.  - micro & nano letters.  . 

marlia morsin, muhamad mat salleh, akrajas ali umar and mohd zainizan sahdan.  (2017).  gold nanoplates for a localized surface plasmon resonance-based boric acid sensor.  - sensors.  947-955. 

norhayati abu bakar, muhamad mat salleh dan akrajas ali umar.  (2017).  detection of creatinine on triangular silver nanoplates surface using surface-enhanced raman scattering sensor.  - international journal of biomedical nanoscience and nanotechnology.  335-342. 

nur adliha abdullah, norhayati abu bakar, joseph g shapter, muhamad mat salleh dan akrajas ali umar.  (2017).  synthesis of silver-platinum nanoferns substrates used in surface-enhanced raman spectroscopy sensors to detect creatinine.  - advances in natural sciences: nanoscience and nanotechnology.  1-4. 

s.a.m. samsuri, m.y.a. rahman, a.a. umar.  (2017).  comparative study of the properties of tio2 nanoflower and tio2-zno composite nanoflower and their application in dye-sensitized solar cells.  - ionics.  1897-1902. 

m.y.a. rahman, l. roza, s.a.m. samsuri, a.a. umar, m.m. salleh.  (2017).  dye-sensitized solar cell utilizing tio2 films prepared via microwave irradiation technique: effect of tio2 synthesis time.  - journal of new materials for electrochemical systems.  59-64. 

setia budi, budhy kurniawan, derrick m. mott, shinya maenosono, akrajas ali umar, azwar manaf.  (2017).  comparative trial of saccharin-added electrolyte for improving the structure of an electrodeposited magnetic feconi thin film.  - thin solid films.  51-57. 

dahyunir dahlan, siti khatijah md saad, ade usra berli, abdil bajili, akrajas ali umar.  (2017).  synthesis of two-dimensional nanowall of cu-doped tio2 and its application as photoanode in dsscs.  - physica e.  185-189. 

muhammad ashraf saiful badri, muhamad mat salleh, noor far`ain md noor, mohd yusri abd rahman, akrajas ali umar.  (2017).  green synthesis of few-layered graphene from aqueous processed graphite exfoliation for graphene thin film preparation.  - materials chemistry and physics.  212-219. 

akrajas ali umar, siti khatijah md saad and muhamad mat salleh.  (2017).  scalable mesoporous platinum diselenide nanosheet synthesis in water.  - acs omega.  3325-3332. 

a.s. sulaiman, m.y.a. rahman, a.a. umar.  (2017).  synthesis of reduced graphene oxide and its application as counter electrode in dye-sensitized solar cell.  - international journal of electroactive materials.  1-5. 

aishah khalid, mohd ambri mohamed & akrajas ali umar.  (2017).  graphene growth at low temperatures using rf-plasma enhanced chemical vapour deposition.  - sains malaysiana.  1111-1117. 

m.y.a. rahman, a.s. sulaiman, a.a. umar, m.m. salleh.  (2017).  dye-sensitized solar cell (dssc) utilizing graphene films counter electrode: effect of graphene oxide (go)content.  - journal of materials science: materials in electronics.  1674-1678. 

s.n. sadikin, m.y.a. rahman, a.a. umar, m.m. salleh.  (2017).  effect of spin coating cycle on the properties of tio2 thin film and performance of dssc.  - international journal of electrochemical science.  5529-5538. 

norhayati abu bakar, muhamad mat salleh, akrajas ali umar and joseph george shapter.  (2017).  direct deposition of silver nanoplates on quartz surface by sequence pre-treatment hydroxylation and silanisation.  - methodsx.  486-491. 

s.a.m. samsuri, m.y.a. rahman, a.a. umar, m.m. salleh.  (2017).  influence of zno growth temperature on the performance of dye-sensitized solar cell utilizing tio2-zno composite films photoanode.  - ionics.  3533-3544. 

norhayati abu bakar, muhamad mat salleh, akrajas ali umar and joseph george shapter.  (2017).  design and measurement technique of surface-enhanced raman scattering for detection of bisphenol a.  - advances in natural sciences: nanoscience and nanotechnology.  1-5. 

noor farain, muhamad mat salleh, muhammad ashraf, abd rahman, mohd yusri, akrajas ali umar.  (2017).  synthesis of blue-luminescence graphene quantum dots using hydrothermal method.  - solid state phenomena.  259-263. 

aziz, t.h.t., salleh, m.m., yahya, m., umar, a.a., rahman, m.y.a, dee, c.f. & yap, c.c., majlis, b.y.m..  (2017).  the effect of go buffer layer insertion on oled electroluminescence.  - eproceedings chemistry.  9-11. 

akrajas ali umar, fera anggelina, siti khatijah md saad, mohd.yusri abd. rahman, iwantono iwantono.  (2017).  influence of ag ion adsorption on the photoactivity of zno nanorods for dye-sensitized solar cell application.  - materials express.  312-318. 

n.a. sadikin, m.y.a. rahman, a.a. umar.  (2017).  tio2-batio3 composite films as photoanode for dye sensitized solar cell: effect of batio3 content.  - journal of new materials for electrochemical systems.  109-113. 

l. roza, m.y.a. rahman, a.a. umar, m.m. salleh.  (2016).  boron doped zno films for dye-sensitized solar cell (dssc): effect of annealing temperature.  - journal of materials science: materials in electronics.  8394-8401. 

norshafadzila m.n., huda a., noor azwen n.a., akrajas a.u., aidil a.h., sahbudin s..  (2016).  fabrication and characterization of pani-ag-co nanocomposite thin films as microbial sensor for e. coli detection.  - materials science forum.  641-649. 

iwantono i., tugirin s., anggelina f., awitdrus, taer e., roza l., umar a.a..  (2016).  effect of growth solution concentration on the performance of gallium doped zno nanostructures dye sensitized solar cells (dsscs).  - aip conference proceedings.  1-8. 

abdullah h., naim n.m., hamid a.a., umar a.a..  (2016).  characterization and fabrication of nanocomposite thin films of pani embedded with ag-mn alloy for e. coli sensor.  - materials today: proceedings.  538-544. 

nur adliha abdullah, norhayati abu bakar, muhamad mat salleh and akrajas ali umar.  (2016).  application of gold nanoseeds in surface-enhanced raman spectroscopy for detection of urea.  - kne engineering.  1-6. 

iwantono iwantono, erni widya putri, fitri yenni naumar, fera anggelina, siti khatijah md saad and akrajas ali umar.  (2016).  performance of dye-sensitized solar cell utilizing ga-zno nanorods: effect of ga concentration.  - international journal of electrochemical science.  7499 - 7506. 

xiaomei chen, aamna balouch, akrajas ali umar, muhamad mat salleh and munetaka oyama.  (2016).  fibrous platinum nanocubes modified indium tin oxide electrodes for effective electrooxidation of alcohols and sensitive detection of hydrazine.  - journal of electroanalytical chemistry.  156-160. 

l. roza, m.y.a. rahman, a.a. umar, m.m. salleh.  (2016).  multi-cycle growth of boron doped zno films as photoanode for dye-sensitized solar cell (dssc).  - international journal of electrochemical science.  10965-10977. 

m.y.a. rahman, a.a. umar, m.s. suait, a. ahmad, r. taslim, l. roza, s.k.m. saad, m.m. salleh.  (2016).  metal oxide nanostructure thin films for dye-sensitized solar cells (dsscs): a brief overview.  - international journal of electroactive materials.  8-13. 

iwan s., fauzia v., umar a.a., sun x.w..  (2016).  room temperature photoluminescence properties of zno nanorods grown by hydrothermal reaction.  - aip conference proceedings.  1-4. 

m.y.a. rahman, l. roza, a.a. umar, m.m. salleh.  (2016).  effect of dimethyl borate composition on the performance of boron doped zno dye-sensitized solar cell (dssc).  - journal of materials science: materials in electronics.  2228-2234. 

elvy rahmi, akrajas ali umar, mohd yusri abd rahman, muhamad mat salleh and munetaka oyama.  (2016).  fibrous aupt bimetallic nanocatalyst with enhanced catalytic performance.  - rsc advances.  27696-27705. 

athar ali shah, akrajas ali umar, muhamad mat salleh.  (2016).  efficient quantum capacitance enhancement in dssc by gold nanoparticles plasmonic effect.  - electrochimica acta.  134-142. 

rahman a.a.a., jamil w.a.w., umar a.a..  (2016).  configurable impedance matching to maximise power extraction for enabling self-powered system based-on photovoltaic cells.  - electronic materials letters.  545-550. 

athar ali shah, akrajas ali umar, and muhamad mat salleh.  (2016).  porous (001)-faceted anatase tio2 nanorice thin film for efficient dye-sensitized solar cell.  - epj photovoltaics.  1-7. 

sin tee tan, chun hui tan, wu yi chong, chi chin yap, akrajas ali umar, riski titian ginting, hock beng lee, kok sing lim, muhammad yahaya, muhamad mat salleh.  (2016).  microwave-assisted hydrolysis preparation of highly crystalline zno nanorod array for room temperature photoluminescence-based co gas sensor.  - sensors and actuators b: chemical.  304-312. 

airul azha abd rahman, akrajas ali umar, xiaomei chen, muhamad mat salleh and munetaka oyama.  (2016).  enhanced thermoelectric properties of bismuth telluride-organic hybrid films via graphene doping.  - applied physics a: materials science and processing.  1-8. 

sin tee tan, akrajas ali umar and muhamad mat salleh.  (2016).  synthesis of defect-rich, (001) faceted-zno nanorod on a fto substrate as efficient photocatalysts for dehydrogenation of isopropanol to acetone.  - journal of physics and chemistry of solids.  73-78. 

altaf yahya ahmed al-she`irey, siti khatijah md saad, akrajas ali umar, mohd yusri abd rahman and muhamad mat salleh.  (2016).  (001) faceted-ga-tio2 microtablet synthesis and its organic perovskite sensitized solar cells characterization.  - journal of alloys and compounds.  470-476. 

u.k.n. din, m.m. salleh, t.h.t. aziz and a.a. umar.  (2016).  composition dependence of photoluminescence properties of poly(9,9-di-n-hexylfluorenyl-2,7-diyl) with perovskite structured srtio3 nanocomposites.  - superlattices and microstructures.  153-156. 

u.k.n. din, t.h.t. aziz, m.m. salleh, and a.a. umar.  (2016).  synthesis of crystalline perovskite-structured srtio3 nanoparticles using an alkali hydrothermal process.  - international journal of minerals, metallurgy and materials.  109-115. 

t.h.t. aziz, m.m. salleh, n.a. bakar, a.a. umar and m.y.a. rahman.  (2016).  electroluminescence enhancement of polymer light emitting diodes through surface plasmons by ag nanoplates.  - acta physica polonica a.  711. 

siti khatijah md saad, akrajas ali umar, mohd. yusri abd. rahman, muhamad mat salleh.  (2015).  porous zn-doped tio2 nanowall photoanode: effect of zn2+ concentration on the dye-sensitized solar cell performance.  - applied surface science.  835-842. 

norhayati abu bakar, joe george shapter, muhamad mat salleh and akrajas ali umar.  (2015).  applied sciences.  - self-assembly of high density of triangular silver nanoplate films promoted by 3-aminopropyltrimethoxysilane.  209-221. 

norhayati abu bakar, muhamad mat salleh dan akrajas ali umar.  (2015).  testing and measurement: techniques and applications.  - .  34 dan 155-159. 

m.y.a. rahman, a.a. umar, l. roza, s.a.m. samsuri, m.m. salleh, i. iwantono, tugirin.  (2015).  effect of growth solution concentration on the performance of boron doped zno dye-sensitized solar cell (dssc).  - journal of new materials for electrochemical systems.  213-218. 

s.a.m. samsuri, m.y.a. rahman, a.a. umar, m.m. salleh.  (2015).  synthesis and characterization of tio2-zno core-shell nanograss hetero-structure and its application in dye-sensitized solar cell (dssc).  - journal of materials science: materials in electronics.  4936-4943. 

airul azha abd rahman, akrajas ali umar, mohamad habrul ulum othman.  (2015).  effect of bismuth telluride concentration on the thermoelectric properties of pedot:pss-glycerol organic films.  - physica e.  293-298. 

m.y.a. rahman, a.a. umar, l. roza, m.m. salleh.  (2015).  morphological, optical, structural and photoelectrochemical properties of tio2 nanostructure prepared via pvp surfactant assisted liquid phase deposition technique.  - journal of experimental nanoscience.  925-936. 

l. roza, m.y.a. rahman, a.a. umar, m.m. salleh.  (2015).  direct growth of oriented zno nanotubes by self-selective etching at lower temperature for photo-electrochemical (pec) solar cell application.  - journal of alloys and compounds.  153-158. 

shaghraf javaid, muhammad akhyar farrukh, iqra muneer, maryam shahid, muhammad khaleeq-ur-rahman, akrajas ali umar.  (2015).  influence of optical band gap and particle size on the catalytic properties of sm/sno2-tio2 nanoparticles.  - superlattices and microstructures.  234-247. 

muhammad tariq shah, aamna balouch, kausar rajar, sirajuddin, imdad ali brohi and akrajas ali umar.  (2015).  selective heterogeneous catalytic hydrogenation of ketone (c=o) to alcohol (oh) by magnetite nanoparticles following langmuir- hinshelwood kinetic approach.  - acs applied materials and interfaces.  6480-6489. 

aamna balouch, akrajas ali umar, elvy rahmi mawarnis, siti khatijah md saad, muhamad mat salleh, mohd yusri abd rahman, i. v. kityk, and munetaka oyama.  (2015).  synthesis of amorphous platinum nanofibers directly on an ito substrate and its heterogeneous catalytic hydrogenation characterization.  - acs applied materials and interfaces.  7776-7785. 

m.y.a. rahman, l. roza, a.a. umar, m.m. salleh.  (2015).  effect of acid boric composition on the properties of zno thin film nanotubes and the performance of dye-sensitized solar cell (dssc).  - journal of alloys and compounds.  86-91. 

i. iwantono, w. nurwidya, l.r. lestari, f.y. naumar, s. nafisah, a.a. umar, m.y.a. rahman, m.m. salleh.  (2015).  effect of growth temperature and time on zno films properties and the performance of dye-sensitized solar cell (dssc).  - journal of solid state electrochemistry.  1217-1221. 

tan s.t., ali umar a., salleh m.m..  (2015).  (001)-faceted hexagonal zno nanoplate thin film synthesis and the heterogeneous catalytic reduction of 4-nitrophenol characterization.  - journal of alloys and compounds.  299-304. 

m.y.a. rahman, l. roza, a.a. umar, m.m. salleh.  (2015).  effect of natrium hydroxide concentration on the properties of zno thin film nanotubes and the performance of dye-sensitized solar cell.  - international journal of electroactive materials.  15-19. 

l. roza, k.a.j. fairuzy, p. dewanta, a.a. umar, m.y.a. rahman, m.m. salleh.  (2015).  effect of molar ratio of zinc nitrate:hexamethylenetetramine on the properties of zno thin film nanorods and nanotubes and the performance of dye-sensitized solar cell (dssc).  - journal of materials science: materials in electronic.  7955-7966. 

s.a.m. samsuri, m.y.a. rahman, a.a. umar, m.m. salleh.  (2015).  effect of zno growth time on the performance of dye-sensitized solar cell utilizing tio2-zno core-shell nanograss hetero-structure.  - materials letters.  388-391. 

muhamad bin mat salleh, burhanuddin bin yeop majlis, akrajas ali umar, dee chang fu.  (2015).  surface-enhanced raman scattering effect of triangular gold nanoframes as ultra sensitive sensor to detect bisphenol a.  - .  . 

s.a.m. samsuri, m.y.a. rahman, a.a. umar, m.m. salleh.  (2015).  effect of zinc acetate dihydrate precursor concentration on the properties of tio2-zno core-shell nanograss hetero-structure.  - journal of alloys and compounds.  460-465. 

dee chang fu, burhanuddin bin yeop majlis, muhamad bin mat salleh, akrajas ali umar, azrul azlan bin hamzah.  (2015).  synthesis and characterization of chalcogenide semiconducting one-dimensional nanowires for phase change memory applications.  - .  . 

fitri yenni naumar, akrajas ali umar, muhamad mat salleh, marjoni imamora ali umar and mohd. yusri abd. rahman.  (2015).  polythiopene sodium poly [2-(3-thienyl)-ethoxy-4-buthylsulfonate] inkjet printed film-sensitized zno nanorods solar cells.  - international journal of electrochemical science.  445-455. 

muhamad bin mat salleh, muhammad bin yahaya, burhanuddin bin yeop majlis, akrajas ali umar.  (2015).  bahan mampan & teknologi hijau untuk peranti berkaitan tenaga.  - .  . 

naim n.m., abdullah h., umar a.a., hamid a.a., shaari s..  (2015).  thermal annealing effect on structural, morphological, and sensor performance of pani-ag-fe based electrochemical e. coli sensor for environmental monitoring.  - scientific world journal.  . 

m.y.a. rahman, a.a. umar, r. taslim, m.m. salleh.  (2015).  effect of surfactant on the physical properties of zno nanorods and the performance of zno photoelectrochemical cell.  - journal of experimental nanoscience.  599-609. 

nafisah s., saad s.k.m., umar a.a., plucinski k., lis m., maciaga a., miedzinski r..  (2015).  laser stimulated nonlinear optics of ag nanoparticle-loaded poriferous tio2 microtablet.  - optica applicata.  263-271. 

akrajas ali umar, suratun nafisah, siti khatijah md saad, sin tee tan, aamna balouch, muhamad mat salleh, munetaka oyama.  (2014).  poriferous microtablet of anatase tio2 growth on an ito surface for high-efficiency dye-sensitized solar cells.  - solar energy materials & solar cells.  122: 174-182. 

akrajas ali umar, elvy rahmi, aamna balouch, mohd yusri abd rahman, muhamad mat salleh and munetaka oyama.  (2014).  highly-reactive agpt nanofern composed of {001}-faceted nanopyramidal spikes for enhanced heterogeneous photocatalysis application.  - journal of materials chemistry a.  17655-17656. 

m. imperiyka, a. ahmad, s.a. hanifah, a.a. umar, n.s. mohamed, m.y.a. rahman.  (2014).  photo-polymerization of methacrylate based polymer electrolyte for dye-sensitized solar cell.  - journal of polymer engineering.  695-702. 

m.y.a. rahman, a.a. umar, l. roza, m.m. salleh.  (2014).  morphology, structure, optical property and photoelectrochemical property of tio2 nanoflower films synthesized via liquid phase deposition technique.  - micro & nano letters.  9(4):253-256. 

a. h.reshak, sin tee tan, fitri yeni naumar, a.a.umar, m.oyama, z. a. alahmed,h. kamarudin, i.v.kityk.  (2014).  photoinduced nonlinear optical second-order optical effects in the ag-zno nanorods.  - international journal of electrochemical science.  6352-6358. 

m.y.a. rahman, a.a. umar, l. roza, m.m. salleh.  (2014).  effect of organic dye on the performance of dye-sensitized solar cell utilizing tio2 nanostructure films synthesized via ctab-assisted liquid phase deposition technique.  - russian journal of electrochemistry.  1072-1076. 

m.y.a. rahman, a.a. umar, l. roza, m.m. salleh.  (2014).  effect of hexamethylenetetramines (hmt) surfactant concentration on the performance of tio2 nanostructure photoelectrochemical cells.  - russian journal of electrochemistry.  974-980. 

m.y.a. rahman, a. ahmad, a.a. umar, r. taslim, m.s. su`ait, m.m. salleh.  (2014).  polymer electrolyte for photoelectrochemical cell and dye-sensitized solar cell:a brief review.  - ionics.  1201-1205. 

sin tee tan, akrajas ali umar, aamna balouch, suratun nafisah, muhammad yahaya, chi chin yap, muhamad mat salleh, i. v. kityk and munetaka oyama.  (2014).  ag-zno nanoreactor grown on fto substrate exhibiting high heterogeneous photocatalytic efficiency.  - acs combinatorial sciences.  314-320. 

md saad s.k., ali umar a., quan nguyen h., fu dee c., mat salleh m., oyama m..  (2014).  porous (001)-faceted zn-doped anatase tio2 nanowalls and their heterogeneous photocatalytic characterization.  - rsc advances.  57054 - 57063. 

mohammad hafizuddin haji jumali, firas k. mohamad alosfur, shahidan radiman, noor j. ridha, mohd ambar yarmo, akrajas ali umar.  (2014).  rapid synthesis of tio2/mwcnts nanocatalyst with enhanced photocatalytic activity using modified microwave technique.  - materials science in semiconductor processing.  25:207-210. 

yap chi chin, muhammad bin yahaya, mohammad hafizuddin bin jumali, muhamad bin mat salleh, rozidawati binti awang, akrajas ali umar.  (2014).  graphene thin film with enhanced electrical conductivity by chemical doping for organic solar cells.  - .  . 

sin tee tan, n.s.alzayed, g.lakshminarayan, f.naumar , a.a.umar, m.oyama,g. myronchuk, i.v.kityk.  (2014).  laser stimulated electrooptics in the ag-zno nanorods.  - physica e.  23-27. 

muhammad shahid, muhammad akhyar farrukh, akrajas ali umar, and muhammad khaleeq ur rahman.  (2014).  solvent controlled synthesis of cao-mgo nanocomposites and their application in the photodegradation of organic pollutants of industrial waste.  - russian journal of physical chemistry a.  842-850. 

iqbal, j., tabassum, h., ahmad, i., jan, t., dee, c.f., madhuku, m., umar, a.a., ahmad, n.  (2014).  carbon ion-beam-induced modification in structural and electrical properties of zno nanowires.  - sains malaysina.  283-287. 

m.y.a. rahman, a.a. umar, r. taslim, l. roza, s.k.m. saad, m.m. salleh.  (2014).  tio2 and zno thin film nanostructure for photoelectrochemical cell application: a brief review.  - international journal of electroactive materials.  4-7. 

akrajas ali umar, muhamad bin mat salleh, mohd yusri bin abd rahman, muhammad bin yahaya.  (2014).  growth of ultraporous platinum nanocrystal directly on ito substrate: investigation on the effect of sodium deocyl sulfate surfactant and formic acid reducingagent on the morphology and their applica….  - .  . 

m. yahaya, sin tee tan, akrajas ali umar, c.c. yap, and m.m. salleh.  (2014).  synthesis of zno nanorod arrays by chemical solution and microwave method for sensor application.  - key engineering materials.  585-588. 

m.y.a. rahman, a.a. umar, s.k.m. saad, m.m. salleh, a. ishaq.  (2014).  effect of dye on the performance of nitrogen doped tio2 solar cell prepared via ammonia treated liquid phase depostion technique.  - journal of new materials for new electrochemical systems.  17(1):33-37. 

sin tee tan, akrajas ali umar, aamna balouch, muhammad yahaya, chi chin yap,muhamad mat salleh, munetaka oyama.  (2014).  zno nanocubes with (101) basal plane photocatalyst prepared via a low-frequency ultrasonic assisted hydrolysis process.  - ultrasonics sonochemistry.  21:754-760. 

aamna balouch, akrajas ali umar, athar ali shah, muhamad mat salleh and munetaka oyama.  (2013).  efficient heterogeneous catalytic hydrogenation of acetone to isopropanol on semihollow and porous palladium nanocatalyst.  - acs applied materials and interface.  5:9843-9849. 

reza zamiri, hamid-reza bahari-poor, azmi zakaria, raheleh jor, golnoosh zamiri, avito rebelo, akrajas ali umar.  (2013).  upconversion properties of the er-doped y2o3, bi2o3 and sb2o3 nanoparticles fabricated by pulsed laser ablation in liquid media.  - chinese physics letters.  Art no.118103. 

aamna balouch, akrajas ali umar, sin tee tan, suratun nafisah, siti khatijah md saad, muhamad mat salleh and munetaka oyama.  (2013).  fibrous, ultra-small nanorod-constructed platinum nanocubes directly grown on the ito substrate and their heterogeneous catalysis application.  - rsc advances.  2013(3):19789. 

firas k mohamad alosfur, mohammad hafizuddin jumali, shahidan radiman, noor j. ridha, ali umar akrajas.  (2013).  visible light photocatalytic activity of tio2/mwcnts nanocomposite prepared using modified microwave technique.  - icst 2013 : 7th international conference on sensing technology.  777-781. 

a.a. umara, m.y.a. rahman, s.k.m. saad, m.m. salleh, m. oyama.  (2013).  preparation of grass-like tio2 nanostructure thin films: effect of growth temperature.  - applied surface science.  270:109- 114. 

rahman, m. y. a.; umar, a. a.; taslim, r.; salleh, m. m..  (2013).  effect of organic dye, the concentration and dipping time of the organic dye n719 on the photovoltaic performance of dye-sensitized zno solar cell prepared by ammonia-assisted hydrolysis technique.  - electrochimica acta.  88:639-643. 

alosfur, f; jumali, mhh; radiman, s; ridha, nj; yarmo, ma; umar, aa.  (2013).  visible light-responsive tio2 coated mwcnts as a hybrid nanocatalysts.  - international journal of electrochemical science.  8(2):2977-2982. 

ishaq, a , iqbal, s., ali, n., khurram, a.a., akrajas, a.u., dee, c.f., naseem, s., rafique, h.m., long, y.  (2013).  h+, n+, and ar+ ion irradiation induced structure changes of carbon nanostructures.  - new carbon materials.  81-87. 

noor j. ridha, mohammad hafizuddin haji jumali, akrajas ali umar, firas k. mohamad.  (2013).  ethanol sensor based on zno nanostructures prepared via microwave oven.  - 2013 seventh international conference on sensing technology (icst).  121-126. 

sin tee tan, akrajas ali umar, muhammad yahaya, muhamad mat salleh, chi chin yap, hong-quan nguyen, chang-fu dee, edward yi chang, and munetaka oyama.  (2013).  formation of a multi-arm branched nanorod of zno on the si surface via a nanoseed-induced polytypic crystal growth using the hydrothermal method.  - science of advanced materials.  5:803-809. 

marjoni imamora ali umar, chi chin yap, rozidawati awang, akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2013).  formation of gold-coated multilayer graphene via thermal reduction.  - materials letters.  106:200-203. 

mark-lee wun-fui, ng kim-hang, lorna jeffery minggu, akrajas ali umar & mohammad b. kassim.  (2013).  a molybdenum dithiolene complex as a potential photosensitiser for photoelectrochemical cells.  - international journal of hydrogen energy.  . 

m.y.a. rahman, a.a. umar, r. taslim, m.m. salleh.  (2013).  effect of ammonia and zinc acetate precursor concentration on the morphology of zno nanorods and the performance of a zno photo-electrochemical cell.  - current nanoscience.  9(6):730-736. 

iwantono iwantono, akrajas ali umar, erman taer, vepy asyana.  (2013).  synthesis and characterization of gold nanoplates onto solid substrates by seed-mediated growth method.  - materials science forum / trans tech publications, switzerland.  . 

norhayati abu bakar, muhamad mat salleh, akrajas ali umar and muhammad yahaya.  (2013).  localized surface plasmon resonance sensor using gold nanoparticles for detection of bisphenol a.  - 2nd international conference on materials and applications for sensors and transducers, ic-mast 2012; budapest; hungary,(key engineering materials).  342-345. 

iqra muneer, muhammad akhyar farrukh, shaghraf shaghraf, muhammad khaleeq-ur-rahman, akrajas ali umar, rohana adnan.  (2013).  solvent controlled synthesis of tin oxide nanocatalysts and their applications in photodegradation of environmental hazardous materials.  - materials science forum / trans tech publications, switzerland.  . 

suratun nafisah, arfian oktaviandi, akrajas ali umar, muhammad mat salleh, aamna balouch, siti khatijah md saad.  (2013).  deposition of au/tio2 nanocomposite on ito surface by seed-mediated liquid phase deposition method.  - journal of physics : conference series (3rd isesco international workshop and conference on nanotechnology 2012 iwcn 2012).  . 

akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2013).  isesco conference on nanomaterials and applications 2012.  - .  . 

sin tee tan, akrajas ali umar, muhamad yahaya, chi chin yap, muhamad mat salleh.  (2013).  ultrafast formation of zno nanorods via seed-mediated microwave assisted hydrolysis process.  - journal of physics: conference series 3rd isesco international workshop and conference on nanotechnology 2012 (iwcn2012).  . 

fitri yenni naumar, akrajas ali umar, mohd yusri abd rahman, muhamad mat salleh, marjoni imamora ali umar, suratun nafisah, siti khatijah md saad, sin tee tan.  (2013).  preparation and characterization of tio2 nanowire-cu2o nanocube composite thin film.  - materials science forum / trans tech publications, switzerland.  . 

siti khatijah md saad, akrajas ali umar, suratun nafisah, muhamad mat salleh, burhanuddin yeop majlis.  (2013).  effect of tio2 nanostructure`s shape on the dsscs performance.  - ieee regional symposium on micro and nanoelectronics (rsm2013).  . 

norshafadzila mohammad naim, huda abdullah, akrajas ali umar, aidil abdul hamid, sahbudin shaari.  (2013).  synthesis of silver nanoparticles embedded in polyvinyl alcohol nanocomposite thin film with various temperatures and its performance of e.coli sensor.  - 27 th regional conference on solid state science & technology (rcssst27).  . 

vivi fauzia, akrajas ali umar, muhamad mat salleh and muhammad yahaya.  (2013).  effect of gold nanoparticles density grown directly on the surface on the performance of organic solar cell.  - current nanoscience.  9:187-191. 

m.y.a. rahman, a.a. umar, l. roza, m.m. salleh.  (2013).  effect of cetyltrimethyl ammonium bromade surfactant concentration on the physical and photoelectrochemical property of tio2 nanowire.  - international journal of electroactive materials.  1(2):28-35. 

noor j. ridha, mohammad hafizuddin haji jumali, akrajas ali umar and f. alosfur.  (2013).  defects-controlled zno nanorods with high aspect ratio for ethanol detection.  - international journal of electrochemical science.  8(4):4583-4594. 

firas k mohamad alosfur, mohammad hafizuddin haji jumali, shahidan radiman, noor j ridha, mohd ambar yarmo and akrajas ali umar.  (2013).  modified microwave method for the synthesis of visible light-responsive tio2/mwcnts nanocatalysts.  - nanoscale research letters.  2013, 8:346. 

noor j. ridha, akrajas ali umar, f. alosfur,mohammad hafizuddin haji jumali, and muhamad mat salleh.  (2013).  microwave assisted hydrothermal method for porous zinc oxide nanostructured-films.  - journal of nanoscience and nanotechnology.  2667-2674. 

sri nengsih, akrajas ali umar, muhamad mat salleh and muhammad yahaya.  (2012).  detection of formaldehyde using plasmonic properties of gold nanoparticles.  - 1st international conference on materials and applications for sensors and transducers, icmast-2011;kos island (key engineering materials).  . 

akrajas ali umar, muhamad mat salleh and muhamad yahaya.  (2012).  opticalelectronic nose based on fe(iii) complex of porphyrins films for detection of volatile compounds.  - key engineering materials.  . 

a. a. umar, mya rahman, r. taslim, m. m. salleh.  (2012).  dye-sensitized solar cell utilizing quasi one-dimensional of highly compact vertical array zno nanorod.  - international journal of electrochemical science.  7:7253-7260. 

sri nengsih, akrajas ali umar, muhamad mat salleh and munetaka oyama.  (2012).  detection of formaldehyde in water: a shape-effect on the plasmonic sensing properties of the gold nanoparticles.  - sensors.  12(8):10309-10325. 

mohammad hafizuddin haji jumali, j. ridha noor, akrajas ali umar, muhammad yahya, muhamad mat salleh.  (2012).  characterization of sno2 nanoparticles prepared by two different wet chemistry methods.  - international conference on nanomaterials, synthesis and characterization, icnsc2011 (advanced materials research).  322-326. 

mohammad hafizuddin haji jumali, k. mohamad al asfoor firas, shahidan radiman, akrajas ali umar..  (2012).  dressing of mwcnts with tio2 nanoparticles using modified microwave method.  - international conference on nanomaterials, synthesis and characterization, icnsc2011 (advanced materials research).  228-231. 

akrajas ali umar, munetaka oyama, muhamad mat salleh, burhanuddin yeop majlis.  (2012).  silver nanocombs and branched nanowires formation in aqueous binary surfactants solution.  - journal of nanoparticles research.  14(7):1001. 

akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2012).  isesco conference on nanomaterials and application 2012.  - isesco conference on nanomaterials and application 2012.  . 

mohammad b. kassim, lorna jeffery minggu, mohd hafizuddin haji jumali, akrajas, ali umar, siti fairus binti mohd yusoff, farah hannan anuar, khuzaimah arifin.  (2012).  progress in photoelectrochemical research 2012.  - .  74. 

v. fauzia, a.a. umar, m.m. salleh and m. yahaya.  (2012).  thermal annealing effect on the morphology of inkjet printed polymer:fullerene composites solar cells.  - acta physica polonica a.  121:155-158. 

akrajas ali umar, mohd yusri abd rahman, siti khatijah md saad, muhamad mat salleh.  (2012).  effect of nh3 concentration on the performance of nitrogen doped tio2 photoelectrochemical cell.  - international journal of electrochemical science.  7(9):7855-7865. 

mohammad hafizuddin haji jumali, noor razinah rahmat, muhammad yahaya, muhamad mat salleh, akrajas ali umar.  (2012).  synthesis of monodisperse cdse qds using controlled growth temperatures.  - advanced materials research.  . 

a.a. umar, m.y.a. rahman, r. taslim, m.m. salleh, m. oyama.  (2012).  effect of the thickness of quasi one-dimensional zinc oxide nanorods synthesized via multiple growth process under ammonia assisted hydrolysis technique on the performance of dye-sensitized solar cell.  - international journal of electrochemical science.  7(9):8384-8393. 

g. husnain, ishaq ahmad, shu-de yao, h. m. rafique, akrajas ali umar and chang fu dee.  (2012).  depth-dependent tetragonal distortion study of algan epilayer thin film using rbs and channeling technique.  - modern physics letters b.  26(14):Art 1250086. 

m. y. a. rahman, a. a. umar, l. roza, m. m. salleh.  (2012).  effect of optical property of surfactant-treated tio2 nanostructure on the performance of tio2 photo-electrochemical cell.  - journal of solid state electrochemistry.  16:2005-2010. 

a. a. umar, ali h. reshak, m. oyama, k. j. plucinski.  (2012).  fluorescent and nonlinear optical features of cdte quantum dots.  - journal of materials science: materials in electronics.  23:546-550. 

vivi fauzia, akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2012).  study phase separation of donor: acceptor in inkjet printed thin films of bulk heterojunction organic solar cells using afm phase imaging.  - advanced materials research.  . 

liszulfah roza, akrajas ali umar, m. y. a. rahman,
muhamad mat salleh.  (2012).  seed-mediated liquid phase deposition method for tio2 nanostructure growth on ito substrate: effect of surfactant.  - advanced materials research.  . 

siti khatijah md saad, akrajas ali umar, mohd yusri abd rahman and muhammad mat salleh.  (2012).  the optical properties of ammonia treated tio2 nanostructure prepared by liquid.  - advanced materials research.  . 

rika taslim, m.y.a. rahman, a.a. umar, m.m.salleh.  (2012).  fabrication of photoelectrochemical cell using highly compact vertical array zno nanorod.  - advanced materials research.  . 

mohammad hafizuddin hj jumali, firas k. mohamad al-asfoor, shahidan radiman and akrajas ali umar.  (2012).  dressing of mwcnts with tio2 nanoparticles using modified microwave method.  - advanced materials research.  . 

fui, m.l.w., hang, n.k., minggu, l.j., umar, a.a., kassim, m.b..  (2012).  determination of band energy levels for tungsten nitrosyldithiolene [penentuan aras jalur tenaga kompleks tungsten nitrosilditiolena].  - sains malaysiana.  41(4):439-444. 

tahir, sfbm; ramli, n; izzuddin, i; salleh, mm; yahaya, m; umar, aa; jumali, mhh.  (2012).  effect of zno addition on structural properties of zno-pani/carbon black thin films.  - sains malaysiana.  41(8):1001-1004. 

akrajas ali umar, iwantono iwantono, ariyanto abdullah, muhamad mat salleh and munetaka oyama.  (2012).  gold nanonetwork film on the ito surface exhibiting one-dimensional optical properties.  - nanoscale research letters.  7:252. 

m. y. a. rahman, a. a. umar, l. roza & m. m. salleh.  (2012).  effect of tio2 nanostructure morphology on the performance of a photoelectrochemical cell of ito/tio2/electrolyte/platinum.  - journal of solid state electrochemistry.  16:3947-3952. 

mokhtar, msam; yap, cc; salleh, mm; umar, aa; yahaya, m.  (2011).  effect of organic salt doping ratios on the performance of poly(9,9-di-n-hexylfluorenyl-2,7-diyl) organic light emitting diode, oled.  - malaysia annual physics conference 2010, perfik-2010; damai laut(aip conference proceedings).  . 

umar, aa; salleh, mm; majlis, by; oyama, m.  (2011).  formation of high-density crystalline-shape gold nanoparticles on indium tin oxide surfaces: effects of alcohothermal seeding.  - journal of nanoscience and nanotechnology.  11(6):4974-4980. 

e. taer, m. deraman, i.a. talib, s.a. hashmi, a.a. umar.  (2011).  growth of platinum nanoparticles on stainless steel 316l current collectros to improve carbon-based supercapacitor performance.  - electrochimica acta.  56:10217-10222. 

m. deraman, e. taer, a.a. umar, n. h. basri, r. farma, awitderus, m.m. ishak.  (2011).  role of nano-particles in modifying contact performance between electrode and current collector of a supercapacitor.  - international workshop on nanotechnology-in the edge on convergence, 24-27 november 2011, ukm.  . 

aidhia rahmi, akrajas ali umar, muhamad mat salleh,
burhanuddin yeop majlis and munetaka oyama.  (2011).  bright photoluminescence of cdte quantum dots formed in phosponic-oleic acids binary surfactants.  - 2010 international conference on optical, electronic and electrical materials, oeem2010; kunming(materials science forum).  . 

sri nengsih, akrajas ali umar, muhamad mat salleh,
muhammad yahaya, munetaka oyama and burhanuddin yeop majlis.  (2011).  plasmonic responses of gold nanoparticles on organic vapor: shape effect.  - 2010 international conference on optical, electronic and electrical materials, oeem2010(materials science forum); kunming.  . 

vivi fauzia, akrajas ali umar, muhamad mat salleh and
muhammad yahaya.  (2011).  the effect of donor:acceptor ratio on the generated photocurrent of inkjet printed blended poly(3-octylthiophene-2.5-diyl)and(6,6)-phenyl c71 butyric acid methyl ester bulk heterojunction organic cell.  - materials science forum.  . 

m. a. aziz, m. oyama, k. ozga, a. wojciechowski, n. al zayed, i.v. kityk , a. ali umar.  (2011).  optical features of the gold nanoparticles deposited on ito substrates.  - optics communications.  284 (1): 245?248. 

mark leewun fui, ng kim hang, lorna jeffery minggu, akrajas ali umar, mohammad b. kassim.  (2011).  molybdenum tp* nitrosyldithiolene complex as potential photosensitizer for photoelectrochemical cell.  - the 3rd international conference on fuel cell & hydrogen technology (icfcht 2011), ukm bangi.  . 

n. r. rahmat, m. yahaya, m. m. salleh, a. a. umar and m. h. jumali.  (2011).  synthesis of high-luminescence cdse quantum dots at various temperatures.  - solid state science and technology.  19(2):144-149. 

norhayati abu bakar, aidhia rahmi, akrajas ali umar,
muhamad mat salleh and muhammad yahaya.  (2011).  fluorescence gas sensor based on cdte quantum dots for detection of volatile organic compounds gas.  - solid state science and technology.  19 (1): 20-25. 

akrajas ali umar, mohd yusri abd rahman, rika taslim, muhamad mat salleh and munetaka oyama.  (2011).  a simple route to vertical array of quasi-1d zno nanofilms on fto surfaces: 1d-crystal growth of nanoseeds under ammonia-assisted hydrolysis process.  - nanoscales research letters.  6:Art. No 564. 

munetaka oyama, akrajas ali umar, muhamad mat salleh & burhanuddin yeop majlis.  (2011).  chemical synthesis of metal nanoparticles in aqueous solutions with the presence of some additives.  - sains malaysiana.  40(12):1345-135. 

vivi fauzia, akrajas ali umar, muhamad mat salleh and
muhammad yahaya.  (2011).  the effect of solvent on the morphology of an inkjet printed active layer of bulk heterojunction solar cells.  - advance natural science: nanoscience and nanotechnology.  2:015014. 

mohammad b. kassim, wan ramli wan daud, lorna jeffery minggu, kamaruzzaman sopian, mohd hafizuddin hj. jumali, akrajas ali umar, ibrahim n. hassan, siti fairus mohd yusoff, yap chi chin.  (2011).  progress in photoelectrochemical research 2011.  - .  99. 

sri nengsih, akrajas ali umar, muhamad mat salleh & muhammad yahaya.  (2011).  detection of volatile organic compound gas using localized surface plasmon resonance of gold nanoparticles.  - sains malaysiana.  40(3):231-235. 

n a bakar, m m salleh, a a umar and m yahaya.  (2011).  the detection of pesticides in water using zncdse quantum dot films.  - advances in natural sciences: nanoscience and nanotechnology.  2 (2011) 025011-4. 

e. taer, m. deraman, i. a. talib, a. awitdrus, s.a. hashmi, a. a. umar.  (2011).  preparation of a highly porous binderless activated carbon monolith from rubber wood sawdust by a multi-step activation process for application in supercapacitors.  - international journal of electrochemical science.  6(8):3301-3315. 

k. ozga, m. oyama, m. szota, m. nabialek, i.v. kityk, a. slezak, a.a. umar, k. nouneh.  (2011).  photoinduced absorption of ag nanoparticles deposited on ito substrate.  - journal of alloys and compounds.  509S:S424-S426. 

norhayati abu bakar, akrajas ali umar, muhamad mat salleh, member, ieee and muhammad yahaya.  (2010).  detection of fungicide in water by zncdse quantum dots thin film.  - proceedings of the 2010 ieee international conference on semiconductor electronics, icse2010 (melaka).  . 

agus supriyanto, kus kusminarto, kuwat triyana, roto roto, muhamad mat salleh and akrajas ali umar.  (2010).  photosensitizing effect of porphyrin films as organic photodetector.  - journal of materials science and engineering.  4(8):40-44. 

setia budi, a.r. daud, s. radiman, akrajas ali umar.  (2010).  effective electrodeposition of co-ni-cu alloys nanoparticles in the presence of alkyl polyglucoside surfactant.  - applied surface science.  257:1027-1033. 

akrajas ali umar, munetaka oyama, muhamad mat salleh, and burhanuddin yeop majlis.  (2010).  formation of highly thin, electron-transparent gold nanoplates from nanoseeds in ternary mixtures of cetyltrimethylammonium bromide, poly(vinyl pyrrolidone), and poly(ethylene glycol).  - crystal growth and design.  10(8):3694-3698. 

rika, m. y. a. rahman, m. m. salleh, a. a. umar, a. ahmad.  (2010).  effect of ionic conductivity of a pan-pc-liclo4 solid polymeric electrolyte on the performance of a tio2 photoelectrochemical cell.  - journal of solid state electrochemistry.  14:2089-2093. 

vivi fauzia, akrajas ali umar, muhamad mat salleh, muhammad yahya.  (2010).  optimizing of the inkjet printing technique parameters for fabrication of bulk heterojunction organic solar cells.  - proceedings of the 2010 ieee international conference on semiconductor electronics, icse2010 (melaka).  . 

aidhia rahmi , akrajas ali umar, muhammad mat salleh, burhanuddin yeop majlis and muhammad yahaya.  (2010).  enhanced-photoluminescence propertiesof cdte quantum dots prepared from the ternary surfactant mixture system.  - proceedings of the 2010 ieee international conference on semiconductor electronics, icse2010 (melaka).  . 

rika taslim, m. y. a. rahman, m. m. salleh, a. ali umar, a. ahmad.  (2010).  fabrication of a nanoparticle tio2 photoelectrochemical cell utilizing a solid polymeric electrolyte of pan-pc-liclo4.  - ionics.  16:639?644. 

munetaka oyama, akrajas ali umar, jingdong zhang.  (2010).  advanced nanomaterials.  - .  Bab 8 hal. 297-318. 

erman taer, mohamad deraman, ibrahim abu talib, akrajas ali umar, munetaka oyama, rozan mohamad yunus.  (2010).  physical, electrochemical and supercapacitive properties of activated carbon pellets from pre-carbonized rubber wood sawdust by co2 activation.  - current applied physics.  1071-1075. 

rika, rahman m.y.a., salleh m.m., umar a.a., ahmad a..  (2010).  effect of the grain size of nanoparticle dye-coated titanium dioxide on the short-circuit current density and open-circuit voltage of an indium tin oxide/titanium dioxide/poly(acrylonitrile)-propylene.  - journal of applied polymer science.  116(6):3278-3282. 

sri nengsih, akrajas ali umar, muhamad mat salleh, and muhammad yahaya.  (2010).  localised surface plasmon resonance of gold nanoparticle-cytocrome c to detect the presence of nitric oxide gas.  - proceedings of the 2010 ieee international conference on semiconductor electronics, icse2010 (melaka).  . 

mohd shahrul akram mokhtar, muhamad mat salleh, akrajas ali umar, chi chin yap, muhammad yahaya.  (2010).  effect of organic salt doping on the performance of poly(9,9-di-n-hexylfluorenyl-2,7-diyl) organic light emitting diode, oled.  - aip conference proceeding (the third nanoscience nanotechnology symposium 2010 : nnsb 2010).  . 

vivi fauzia, akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2010).  the dependence of donor:acceptor ratio on the photovoltaic performance of blended poly (3-octylthophene-2,5-diyl) and (6,6)-phenyl c71 butyric acid methyl ester bulk heterojunction organic solar cells.  - aip conference proceeding (the third nanoscience nanotechnology symposium 2010 : nnsb 2010).  . 

norhayati abu bakar, aidhia rahmi, akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2010).  fluorescence properties of hybrids cdte quantum gots-porphyrin thin films in organic vapors.  - aip conference proceeding/ the third nanoscience and nanotechnology symposium 2010 (nnsb2010).  . 

aidhia rahmi, akrajas ali umar, muhamad mat salleh, burhanuddin yeop majlis, muhammad yahya.  (2010).  facile approach for preparing cdse/cdte heterostructure quantum dots.  - aip conference proceeding (the third nanoscience nanotechnology symposium 2010 : nnsb 2010).  . 

norhayati abu bakar, aidhia rahmi, akrajas ali umar,
muhamad mat salleh and muhammad yahaya.  (2010).  fluorescence gas sensor using cdte quantum dots film to detect volatile organic compounds.  - 2010 international conference on optical, electronic and electrical materials, oeem2010; kunming (materials science forum).  . 

aidhia rahmi, akrajas ali umar, muhammad mat salleh, burhanuddin yeop majlis and muhammad yahya.  (2010).  tunable luminescence of cdte quantum dots.  - solid state science and technology.  18 (2): 21-26. 

norhayati abu bakar, akrajas ali umar*, muhamad mat salleh & muhammad yahaya.  (2010).  synthesis of cdte-cdse core-shell quantum dots with luminescence in the red.  - sains malaysiana.  39(3): 473-477. 

goyal r.n., aliumar a., oyama m..  (2009).  comparison of spherical nanogold particles and nanogold plates for the oxidation of dopamine and ascorbic acid.  - journal of electroanalytical chemistry.  631(1-2):58-61. 

akrajas ali umar and munetaka oyama.  (2009).  high-yield synthesis of tetrahedral-like gold nanotripods using an aqueous binary mixture of cetyltrimethylammonium bromide and hexamethylenetetramine.  - crystals growth and design.  9(2):1146-1152. 

vivi fauzia, norhayati abu bakar, akrajas ali umar, muhamad mat salleh and muhammad yahya.  (2009).  blue-shifting of energy gap of cdse quantum dots by indium doping.  - ieee-rsm proceeding.  . 

supriyanto, a., triyana, k., roto, kusminarto, salleh, m.m., umar, a.a..  (2009).  fabrication and performance studies of tio2 and porphyrin heterojunction based organic photodetector.  - journal of optoelectronics and advanced materials.  11(11):1760-1764. 

sepeai s., salleh m.m., yahaya m., umar a.a..  (2009).  improvement of white organic light emitting diode performances by an annealing process.  - thin solid films.  517(16):4679-4683. 

sri nengsih, akrajas ali umar, muhamad mat salleh and muhammad yahya.  (2009).  detection of voc`s gas using localized surface plasmon resonance of gold nanoparticle.  - proceeding of nanotech malaysia 2009.  . 

akrajas ali umar, munetaka oyama, muhamad mat salleh and burhanuddin yeop majlis.  (2009).  formation of high-yield gold nanoplates on the surface: effective two-dimensional crystal growth of nanoseed in the presence of poly(vinylpyrrolidone) and cetyltrimethylammonium bromide.  - crystals growth and design.  9(6):2835-2840. 

aidhia rahmi, akrajas ali umar, muhammad mat salleh, burhanuddin yeop majlis and muhammad yahya.  (2009).  tunable and highly luminescence of cdte quantum dots.  - proceeding of nanotech malaysia 2009.  . 

vivi fauzia, akrajas ali umar, muhamad mat salleh, muhammad yahaya and burhanuddin yeop majlis.  (2009).  the performance of ink-jet printed organic solar cell using blended p3ot/pcbm: effect of active materials concentration.  - proceeding of nanotech malaysia 2009.  . 

rika, m.y.a.rahman , m.m.salleh, a.a.umar , a.ahmad.  (2009).  synthesis and characterization of tio2 nanoparticle films coated with organic dyes.  - physica b: condensed matter.  404(8-11):1420-1422. 

norhayati abu bakar, akrajas ali umar, muhamad mat salleh, muhammad yahaya.  (2009).  preparation of tunable luminescence of cdte-cdse core-shell quantum dots.  - proceeding of nanotech malaysia 2009.  . 

norhayati abu bakar, akrajas ali umar, muhamad mat salleh, muhammad yahaya,burhanuddin yeop majlis.  (2009).  highly red luminescence properties from ternary zncdte quantum dots.  - proceeding of smart materials and nanotechnology in engineering.  . 

vivi fauzia, akrajas ali umar, muhamad mat salleh, muhammad yahya, burhanuddin yeop majlis.  (2009).  the synthesisof cdse quantum dots and solar cells application.  - jurnal elektronika dan telekomunikasi.  2009: Vol. 9 (2), 149-153. 

tengku hasnan tengku aziz,m. m- salleh, m- yahaya and akrajas ali umar.  (2009).  fabrication of hybrid quantum dots-polymer devices.  - journal of solid state science and technology letters.  2009:16 (1&2), 96-101.. 

n. a. bakar, a. ali umar, m. m. salleh dan m. yahaya.  (2009).  synthesis of ternary zncdte quantum dots and optical properties.  - ieee-rsm proceeding/malaysia.  . 

sri nengsih, akrajas ali umar, muhamad mat salleh and muhammad yahaya.  (2009).  growth of gold nanoparticles on the surface using microwave-assisted alcoholthermal seed and growth method.  - ieee-rsm proceeding.  . 

akrajas ali umar, muhamad mat salleh & muhammad yahaya.  (2008).  optical gas sensing selectivity property of ruthenium (ii)-metalloporphyrins langmuir-blodgett films.  - current applied physics.  8(1):53-56. 

tengku hasnan tengku aziz, m. m. salleh, m. yahaya and akrajas ali umar.  (2008).  fabrication of cdse quantum dots-phf organic hybrid light-emitting diodes.  - proceedings 2008 ieee international conference on semiconductor electronics, ed chapter, (icse 2008) ieee malaysia section: ukm bangi.  . 

suhaila sepeai, akrajas ali umar, muhamad mat salleh, muhamad yahaya.  (2008).  electroluminescent from hybrid of cdse quantum dot-organic light emitting diode.  - proceedings of international conference on semiconductor electronic (icse 2008).  . 

norhayati abu bakar, akrajas ali umar, tengku hasnan tengku aziz, siti hajar abdullah, muhamad mat salleh, burhanuddin yeop majlis, muhammad yahaya.  (2008).  synthesis of cdse quantum dots: effect of surfactant on the photoluminescence property.  - international conference on semiconductor electronics 2008 (icse 2008), ieee catalog no.:cfp08421-cdr; isbn:978-1-4244-2561-7.  .