Imaging Ultraviolet Light-Induced Oxygen Vacancy Diffusion on TiO<sub>2</sub>(110) Surface

Xiangyun Zhao; Dong Wei; Xianchi Jin; Ling Jiang; Zhibo Ma; Xueming Yang

doi:10.1063/1674-0068/cjcp2302012

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Xiangyun Zhao, Dong Wei, Xianchi Jin, Ling Jiang, Zhibo Ma, Xueming Yang. Imaging Ultraviolet Light-Induced Oxygen Vacancy Diffusion on TiO2(110) Surface[J]. Chinese Journal of Chemical Physics . doi: 10.1063/1674-0068/cjcp2302012

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Xiangyun Zhao, Dong Wei, Xianchi Jin, Ling Jiang, Zhibo Ma, Xueming Yang. Imaging Ultraviolet Light-Induced Oxygen Vacancy Diffusion on TiO₂(110) Surface[J]. Chinese Journal of Chemical Physics . doi: 10.1063/1674-0068/cjcp2302012

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Imaging Ultraviolet Light-Induced Oxygen Vacancy Diffusion on TiO₂(110) Surface

doi: 10.1063/1674-0068/cjcp2302012

Xiangyun Zhao^{1, 2},
Dong Wei¹,
Xianchi Jin³,
Ling Jiang¹,
Zhibo Ma^{4
,
,},
Xueming Yang^{1, 5
,
,}

1.
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Scienta Omicron (Beijing) Analytical Instrument Co., Ltd., Beijing 100044, China
4.
Huayang Scientific Instruments, Suzhou 215300, China
5.
Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China

More Information

Corresponding author: E-mail: ma@huayang-vac.com; xmyang@dicp.ac.cn
Received Date: 2023-02-02
Accepted Date: 2023-04-22

Available Online: 2023-05-25

Abstract

Abstract

We report here scanning tunneling microscopy (STM) observations of bridge-bonded oxygen vacancies (OVs) on the TiO₂(110) surface diffusing under the influence of 266 nm ultraviolet (UV) laser irradiation. OV pairs, and even OV trimers, were formed as a result of UV light-induced OV diffusion. There are two stable STM representations of the OV-pair defects, which are interchangeable during scanning. An extended irradiation time (68 min) can lead to the formation of a TiO₂(110) surface with predominant OV-pair point defects. Our results enrich the understanding of OV behavior upon UV irradiation, and future photocatalytic studies on reduced rutile TiO₂(110) surfaces involving 266 nm UV light can benefit from the knowledge of the observed diffusion of OVs and the formation of OV oligomers. We also provide a plausible way to prepare an OV-pair abundant TiO₂(110) surface, a requisite for further investigations of the otherwise unapproachable defects.
- Titanium dioxide,
- Scanning tunneling microscopy,
- Ultraviolet irradiation,
- Oxygen vacancy

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References(37)

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