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Photoelectron Spectroscopic Study of Methanol Adsorbed Rutile TiO2(110) Surface
Qun-qing Hao1, Zhi-qiang Wang1,2, Dong-xu Dai1, Chuan-yao Zhou1, Xue-ming Yang1
1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China;2.School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071 China
Abstract:
Methanol/TiO2(110) is a model system in the surface science study of photocatalysis where methanol is taken as a hole capture. However, the highest occupied molecular orbital of adsorbed methanol lies below the valence band maximum of TiO2, preventing the hole transfer. To study the level alignment of this system, electronic structure of methanol covered TiO2(110) surface has been measured by ultraviolet photoelectron spectroscopy and the molecular orbitals of adsorbed methanol have been clearly identified. The results indicate the weak interaction between methanol and TiO2 substrate. The static electronic structure also suggests the mismatch of the energy levels. These static experiments have been performed without band gap excitation which is the prerequisite of a photocatalytic process. Future study of the transient electronic structure using time-resolved UPS has also been discussed.
Key words:  Methanol  TiO2  Ultraviolet photoelectron spectroscopy  Level alignment
FundProject:This work was supported by the National Natural Science Foundation of China (No.21573225 and No.21703164), the Youth Innovation Promotion Association of CAS (No.2017224) and the Natural Science Foundation of Liaoning Province (No.2015020242).
CH3OH/TiO2(110)界面的光电子能谱研究
郝群庆1, 王志强1,2, 戴东旭1, 周传耀1, 杨学明1
1.中国科学院大连化学物理研究所分子反应动力学国家重点实验室, 大连 116023;2.西安电子科技大学物理与光电工程学院, 西安 710071
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DOI:10.1063/1674-0068/30/cjcp1711219
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