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Photoelectrochemical properties of sol-gel derived TiO2 thin films in aqueous sodium oxalate solution

Zainal Z., Lee C. Y., Hussein M. Z., Kassim A.

Materials Science Poland

2004

Vol. 22, No. 2

99--110

Photoelectrooxidation of aqueous sodium oxalate on TiO2 thin films has been investigated. The films, prepared by sol-gel dip-coating, were characterised using Scanning Electron Microscopy and X-ray Diffractometry. Photosensitivity of samples was studied using Linear Sweep Voltammetry and Chronoamperometry techniques. The photoelectrochemical performance of thin film electrodes was evaluated in function of heat treatment, number of dip-coatings and applied potential. The percentage of oxalate degradation was determined by calculating the total charge from the photocurrent. The films heat-treated at 773 K were better fitted to indirect optical transition with Eg = 3.21 eV.

Tin selenide thin films prepared through combination of chemical precipitation and vacuum evaporation technique

Zainal Z., Nagalingam S., Kassim A., Hussein M. Z., Yunus W. M. M.

Materials Science

2003

Vol. 21, No. 2

225-233

Tin selenide thin films were prepared through combination of chemical precipitation and vacuum evaporation technique. The vacuum deposition was carried out at different quantity of the starting material. The difference in the structural and compositional properties of the deposited films were studied. The films were characterised using various techniques such as x-ray diffractometry, scanning electron microscope and energy dispersive analysis of x-ray. Photoactivity of the samples was studied using linear sweep voltammetry. The films were found to be p-type semiconductors. The optical bandgap energy was found to be indirect and equal to Eg = 1.25 eV.