Photochemistry of Monolayer CH3I on Ag-Covered TiO2(110) Surface

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概要

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• The photochemistry of monolayer methyl iodide (CH3I) on a silver-covered TiO2(110) surface is studied by X-ray photoelectron spectroscopy (XPS). Upon the UV irradiation of CH3I/Ag/TiO2(110) at a cryogenic temperature, methyl iodide undergoes desorption and dissociation. The cross sections for CH3I dissociation and desorption are measured at different photon wavelengths of 251, 290, 312, 364, 403, and 546 nm. The photochemistry of monolayer CH3I on Ag/TiO2(110) is wavelength dependent. While photodissociation is the predominant mechanism for CH3I depletion upon irradiation with large-wavelength lights, the nonthermal photodesorption of molecular CH3I becomes the major process at wavelengths below 312 nm. The desorption of energetic CH3 fragments following CH3I photodissociation is evident. Possible mechanisms for the present photochemistry of CH3I on Ag/TiO2(110) are discussed and compared with those on the Ag(111) and TiO2(110) surfaces.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-10-15

著者

• Lin Jong-Liang

  Department of Chemistry, National Cheng Kung University, Tainan, 701, Taiwan

• Tsai Chih-Song

  Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei, 106, Taiwan

• Su Chaochin

  Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, 106, Taiwan

• Chen Chih-Chieng

  Department of Chemistry, National Cheng Kung University, Tainan, 701, Taiwan

• Lin Jiing-Chyuan

  Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei, 106, Taiwan

関連論文

• Hydrothermal Preparation of Anatase TiO2 Nanoparticles for Dye-Sensitized Solar Cells
• Photochemistry of Monolayer CH3I on Ag-Covered TiO2(110) Surface

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