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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.  . 

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.  . 

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. 

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.  . 

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.  . 

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.  . 

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.  . 

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. 

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.  . 

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. 

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, 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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, 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. 

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. 

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. 

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, 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. 

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. 

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. 

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, 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. 

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. 

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.  . 

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. 

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. 

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. 

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. 

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. 

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. 

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, 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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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. 

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.