Imaging the surface potential at the steps on the rutile TiO2(110) surface by Kelvin probe force microscopy

被引：0
作者：
Miyazaki M. [1 ]
Wen H.F. [1 ]
Zhang Q. [1 ]
Adachi Y. [1 ]
Brndiar J. [2 ]
Štich I. [2 ]
Li Y.J. [1 ]
Sugawara Y. [1 ]
机构：
[1] Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamdaoka, Suita, Osaka
[2] Institute of Physics, CCMS, Slovak Academy of Sciences, Bratislava
来源：
Beilstein Journal of Nanotechnology | 2019年 / 10卷
基金：
日本学术振兴会;
关键词：
Catalyst; Kelvin probe force microscopy; Smoluchowski effect; Step; Titanium dioxide;
D O I：
10.3762/BJNANO.10.122
中图分类号：
学科分类号：
摘要：
Although step structures have generally been considered to be active sites, their role on a TiO2 surface in catalytic reactions is poorly understood. In this study, we measured the contact potential difference around the steps on a rutile TiO2(110)-(1 × 1) surface with O2 exposure using Kelvin probe force microscopy. A drop in contact potential difference was observed at the steps, indicating that the work function locally decreased. Moreover, for the first time, we found that the drop in contact potential difference at a < 1-11 > step was larger than that at a < 001 > step. We propose a model for interpreting the surface potential at the steps by combining the upward dipole moment, in analogy to the Smoluchowski effect, and the local dipole moment of surface atoms. This local change in surface potential provides insight into the important role of the steps in the catalytic reaction. © 2019 Miyazaki et al.
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页码：1228 / 1236
页数：8
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