Effects of Y3+ dopant on the photoinduced superhydrophilicity of thin nanostructured titania films and its mechanism
- 化学化工－已发表论文 
Homogeneous and transparent thin nanostructured titania films doped by Y3+ were prepared on glass substrates by sol-gel processing and dip-coating technique. The films were characterized by XRD, XPS and visible absorption spectra. The hydrophilicity of the films was determined by measuring the water contact angles for the films. The effects of Y3+ doping, the quantities of Y3+ dopant, and the intensity and the time of light illumination on hydrophilicity of the films were studied. The results revealed that the film at a mole percent of x (Y-3/Ti4+) = 1.5% had a water contact angle of less than 5degrees after UV illumination for 30min or sunlight for 1h, showing superhydrophilicity. The films behaved more sensitive to photoinduction and more significantly stable in superhydrophilicity, compared with the pure titania ones. This might partly be relative with the fixed, extra and highly concentrated oxygen vacancies resulted from Y3+ doping, the mechanics of which were as described in the solid state chemistry.