The catalytic performance of metal oxide surface mainly depends on its atomic surface structure, which usually changes under various treatment conditions and during catalytic reactions. Therefore, it is quite important to acquire the atomic geometries of the surfaces under different treatments for further understanding the catalytic mechanisms in the surfaces with complicated reconstructions. Here, we report the investigation on the evolution of surface geometries of the Ar+-ion-sputtered anatase TiO2(001) films followed by heating treatments at various temperatures, characterized using variable-temperature scanning tunneling microscopy. Our experimental results reveal the different surface morphologies at different heating temperatures. During the heating treatment, the migrations of O atoms from the bulk to the surface of TiO2(001) play an important role in the reoxidation of the Ti2+ and Ti3+ states for the formation of (1×4) reconstruction. The atomic-resolution images of the ridges show asymmetric features, which well support the fully oxidized structural model of the reconstructed TiO2(001)-(1×4) surface.
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April 2023
Research Article|
April 01 2023
In-situ measurements of reconstructed anatase TiO2(001) surface by variable-temperature STM
Special Collection:
Virtual Issue on Molecular Spectroscopy (2023)
Jianyi Liu;
Jianyi Liu
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Xiaochuan Ma;
Xiaochuan Ma
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Xintong Li;
Xintong Li
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Zhengwang Cheng;
Zhengwang Cheng
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Xuefeng Cui;
Xuefeng Cui
*
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Chin. J. Chem. Phys. 36, 125 (2023)
Article history
Received:
March 17 2022
Accepted:
April 01 2022
Citation
Jianyi Liu, Xiaochuan Ma, Xintong Li, Zhengwang Cheng, Xuefeng Cui, Bing Wang; In-situ measurements of reconstructed anatase TiO2(001) surface by variable-temperature STM. Chin. J. Chem. Phys. 1 April 2023; 36 (2): 125. https://doi.org/10.1063/1674-0068/cjcp2203044
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