Abstract
Undoped and C-doped TiO 2 thin films have been prepared by sol–gel process. Their structure and optical properties have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy. It has been observed that C dopants retard the transformation from anatase-to-rutile phase. Namely, C doping effect is attributed to the anatase phase stabilization. The optical analyses show that the optical band gap of anatase C-doped TiO 2 decreases with increasing amount of C. Also, it is founded that C dopants have been shown to make TiO 2 have a visible light photoresponse.
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