Mohd Zamzuri Mohammad Zain, Dr.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39298
This page provides access to scholarly publication by UniMAP Faculty members and researchers2024-03-29T10:37:24ZElectrodeposited ZnO-nanowire/Cu2O photovoltaic device with highly resistive ZnO intermediate layer
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/61801
Electrodeposited ZnO-nanowire/Cu2O photovoltaic device with highly resistive ZnO intermediate layer
Mohd Zamzuri, Mohammad Zain; Masanobu, Izaki; Ohta, Takayuki; Kondo, Misaki; Takahashi, Toshiaki; Fariza, Mohamad; Junji, Sasano; Shinagawa, Tsutomu; Pauporté, Thierry
Cl-doped ZnO-nanowire (Cl:ZnO-nws)/Cu2O photovoltaic devices were prepared by electrodeposition in aqueous solutions, and the effects of the insertion of the highly resistive ZnO (i-ZnO) layer has been demonstrated by an improvement of the photovoltaic performance. The Cl:ZnO-nws and i-ZnO layer were prepared by electrodeposition in a zinc chloride aqueous solution with saturated molecular oxygen and simple zinc nitrate aqueous solution, respectively. The i-ZnO layer was directly deposited on the Cl:ZnO-nws and suppressed the electrodeposition of the Cu2O layer on the Cl:ZnO-nws. The insertion of the i-ZnO layer between the Cl:ZnO-nws and Cu2O layers induced an improvement in the photovoltaic performance from 0.40 to 1.26% with a 0.35 V open circuit voltage, 7.1 mA•cm-2 short circuit current density, and 0.52 fill factor due to the reduction of the recombination loss.
Link to publisher's homepage at http://pubs.acs.org
2014-07-01T00:00:00ZPhoton-assisted electrochemical construction of <0001>-n-ZnO/<111>-p-Cu2O photovoltaic devices with intermediate TiO2 layer
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/44152
Photon-assisted electrochemical construction of <0001>-n-ZnO/<111>-p-Cu2O photovoltaic devices with intermediate TiO2 layer
Mohd Zamzuri, Mohammad Zain; Junji, Sasano; Fariza, Mohamad; Masanobu, Izaki
The <111>-Cu2O/<0001>-ZnO photovoltaic (PV) device has been constructed by a photon-assisted electrochemical reaction in aqueous solutions, and the effect of the insertion of the TiO2 layer prepared by a sol-gel technique on the photovoltaic performance was investigated. The structural, optical, and electrical characterizations were carried out with XRD, FE-SEM, UV-Vis-NIR spectrophotometer, and solar simulator. The <0001>-ZnO/TiO2/<111>-Cu2O PV-devices showed a photovoltaic performance under AM1.5 illumination, and the performance changed depending on the preparation condition for the TiO2 layer. The substrate-type <0001>-ZnO/TiO2/<111>-Cu2O PV device prepared under optimized condition showed a photovoltaic performance with the short-circuit current density of 2.14 mAcm-2
Link to publisher's homepage at http://ecst.ecsdl.org/
2014-10-01T00:00:00ZA study on biocompatibility of gadolinium based anodizing coating AZ91D magnesium alloy in Simulated Body Fluid (SBF) solution
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/44150
A study on biocompatibility of gadolinium based anodizing coating AZ91D magnesium alloy in Simulated Body Fluid (SBF) solution
Farah Alina, Ab. Aziz; Siti Norbahiyah, Mohamad Badari; Mohd Zamzuri, Mohammad Zain
Pure Mg and AZ91D alloy was anodized with and without the gadolinium nitrate Gd(NO3)3 in different concentrations (0.001g/l, 0.025g/l, 0.05g/l, 0.075g/l and 0.09g/l) at a constant current density and treatment time of 10mA/cm2 and 5 minutes. The results showed that the optimum gadolinium concentration is 0.075g/l due to obtaining the anodic film with high corrosion resistance. The surface morphology and microstructure of anodic coating were investigated by scanning electron microscopy (SEM), optical microscope (OM), and potentiodynamic polarization, respectively.
Link to publisher's homepage at http://www.scientific.net
2014-06-01T00:00:00ZBioactivity behavior of YSZ-Al2O3/10HAP bioceramics composites in simulated body fluid
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/44149
Bioactivity behavior of YSZ-Al2O3/10HAP bioceramics composites in simulated body fluid
Nur Liyana, M Rosli; Nur Maizatul Shima, Adzali; Mohd Zamzuri, Mohammad Zain
Yttria-stabilized zirconia and alumina made significant contributions to the development of health care industry, specifically as orthopedic and dental materials. Both bioceramics are nearly inert ceramics, as they do not allow the interfacial bonding with tissue. Thus, it is necessary to provide bioactive surrounding as to elicit a specific biological response at the interface of material. This research reported the microstructure and bioactivity behavior of YSZ-Al2O3/10HAP with 30 wt. % and 60 wt. % of YSZ content. Powders were mixed before being compacted at 225MPa using uni-axial press machine. The composites were sintered at 1200°C with heating rate of 10°C/min. Invitro bioactivity behavior of the composites were evaluated by immersing the composites into simulated body fluid. Results from x-ray diffraction pattern, confirmed the phase formation of apatite by the presence of Ca2P2O7, and CaO that might be useful on implant cell interaction in a body environment. The apatite formation was observed on the surfaces of the composites by SEM only after 9 days of immersion and subsequently apatite nucleation increased with prolonging immersion time. The dynamic changes in pH, between ion concentration in SBF and bioceramics surfaces correspondedwith an immersion time. Up to 30 days of immersion, the pH value of SBF stabilized approximately around pH 7.4 -7.6, similar to the human blood plasma. Formation of apatite on composites surface of prepared YSZ-Al2O3/10HAP bioceramics may contribute to the improved biocompatibility and osteoconductivity.
Link to publisher's homepage at http://www.scientific.net
2014-06-01T00:00:00Z