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. 

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. 

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. 

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. 

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. 

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. 

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).  . 

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.  . 

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).  . 

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

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).  . 

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.  . 

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.  . 

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.  . 

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. 

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.  . 

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.  . 

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. 

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.  . 

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.  . 

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.  . 

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.  . 

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).  . 

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).  . 

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.  . 

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).  . 

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).  . 

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, 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, 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).  . 

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).  . 

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, 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).  . 

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).  .