Abstract
Nanocrystalline In 2O 3 thin films and powders have been prepared by sol–gel procedure and characterized by various bulk and surface techniques (X-ray diffraction, X-ray photoelectron spectroscopy and photoelectrochemical spectroscopy). Photocatalytic reactivity for rhodamine 6G photodestruction and photoelectrochemical (PEC) properties have been studied for the In 2O 3 samples heated at different temperatures. The photocatalytic activity of the powder grows initially with increasing annealing temperature from 200 to 300°C and then drops sharply with further increase in temperature. A strikingly large difference in photocurrent onset potentials and photocurrent quantum yields has been revealed for the films heated at 200 and 400°C. The susceptibility of the oxide surface to hydroxylation appears to be a key factor responsible for the sharp change in photoreactivity and PEC properties.
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