Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (07): 1037-1041.doi: 10.3866/PKU.WHXB20070714

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Hydrophilicity of TiO2 Thin Films Codoped with Iron and Nitrogen

HUANG Dong-Sheng; ZENG Ren-Jie; CHEN Chao-Feng; LI Yu-Hua   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2007-01-24 Revised:2007-03-22 Published:2007-07-03
  • Contact: ZENG Ren-Jie

Abstract: TiO2 doped with iron (Fe-TiO2) thin films were synthesized using sol-gel method. TiO2 codoped with iron and nitrogen (Fe/N-TiO2) thin films were prepared by calcining Fe-TiO2 thin films in ammonia atmosphere. The influence of iron and nitrogen doping concentration, heat-treatment temperature and film thickness on the hydrophilicity of the films were studied by XRD, XPS, SEM, UV-Vis spectra and measured water contact angle. The results indicated that Fe/N-TiO2 (0.5%Fe,molar percent) films were optimumin hydrophilicity, especially under visible-light irradiation. Doping iron mostly reduced the recombination of electrons and holes, and doping nitrogen in TiO2 enhances photoresponse in visible-light region. The hydrophilicity benefited fromboth effects.

Key words: Sol-gel method, Iron and nitrogen codoping, Titania, Hydrophilicity


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