Methanol Adsorption on TiO2 Film Studied by Sum Frequency Generation Vibrational Spectroscopy (cited:2) |
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| Authors: | Ran-ran Feng An-an Liu Shuo Liu Jiao-jian Shi Yi Liu Ze-feng Ren |
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| Affiliation: | 1.International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, China;Collaborative Innovation Center of Quantum Matter, Beijing 100871, China2.International Center for Quantum Materials (ICQM) and School of Physics, Peking University, Beijing 100871, China |
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| Abstract: | ![]()
A broadband infrared surface sum frequency generation vibrational spectroscopy (SFG-VS) and an in situ UV excitation setup devoted to studying surface photocatalysis have been constructed. With a home-made compact high vacuum cell, organic contaminants on TiO2 thin lm surface prepared by RF magnetron sputtering were in situ removed under 266 nm irradiation in 10 kPa O2 atmosphere. We obtained the methanol spectrum in the CH3 stretching vibration region on TiO2 surface with changing the methanol pressure at room temperature. Features of both molecular and dissociative methanol, methoxy, adsorbed on this surface were resolved. The CH3 symmetric stretching vibration frequency and Fermi resonance of molecular methanol is red-shifted by about 6?8 cm-1 from low to high coverage. Moreover, the recombination of dissociative methanol and H on surfaces in vacuum was also observed. Our results suggest two equilibria exist: between molecular methanol in the gas phase and that on surfaces, and between molecular methanol and dissociative methanol on surfaces. |
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| Keywords: | Surface sum frequency generation vibrational spectroscopy Surface photo-catalysis TiO2 |
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