Abstract
The main aim of this study was to investigate size-dependent effect on the photoelectrochemical properties of nanostructured tungsten trioxide (WO3) thin films synthesized via electrochemical method. Firstly, the nanostructured WO3 thin films of different crystalline sizes were synthesized on fluorine-doped tin oxide (FTO) glass working electrodes followed by controlled annealing treatment at temperature of 100-600°C. The resultant nanostructured WO3 thin films were further characterized using field emission-scanning electron microscopy (FE-SEM) and photocurrent density measurements. Through FE-SEM analysis, it was found that the WO3 crystalline size increases with increasing annealing temperature that resulted in elevated photocurrent per unit area of the synthesized nanostructured WO3 thin films. Finally, it was observed that the highest photocurrent density of up to 35μA/cm2 was attained for WO3 crystallines size of 86nm that formed at the annealing temperature of 600°C.
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