J. Phys. Chem. B, 107(44) 12042-12044(2003)

Photoinduced Changes of Adsorbed Water on a TiO₂ Photocatalytic Film as Studied by ¹H-NMR Spectroscopy

Atsuko Y. Nosaka,^* Eiichi Kojima, ^† Toshimichi Fujiwara, ^†† Hiromasa Yagi, ^†† Hideo Akutsu^†† and Yoshio Nosaka^*
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940-2188, Japan ^† Research Institute, TOTO Ltd., Kanagawa, 253-8577, Japan ^†† Institute for Protein Research, Osaka University, Suita, 565-0871, Japan

(Abstract)
The enhancement of the signal intensity of water molecularly adsorbed on TiO₂ films could be observed on UV irradiation by ¹H-NMR spectroscopy, which was reported difficult so far to elucidate with the alternative spectroscopic techniques such as X-ray photoelectron spectroscopy (XPS), temperature programmed desorption (TPD), and infrared reflection absorption spectroscopy (IRAS). It was also confirmed that the enhanced NMR signals resulted from the photoinduced hydrophilic conversion of the film surface decreased back to the original state with the recovery to the less hydrophilic state of the TiO₂ film surface when the film was kept in the dark.

業績一覧による研究紹介にもどる

野坂芳雄ホームページにもどる