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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.  . 

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.  . 

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. 

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. 

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. 

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. 

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.  . 

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, 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, 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.  . 

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. 

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, 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.  . 

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.  . 

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.  . 

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.  . 

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.  . 

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. 

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, 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).  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.  (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, 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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, 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.  . 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 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. 

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, 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. 

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. 

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. 

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 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.