Local dipole moment on rutile TiO2(110) surface by electrostatic force microscopy

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Yanjun Li

Osaka University, Japan

: J Nanomater Mol Nanotechnol

Abstract

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Au/TiO2(110) surfaces display extremely high catalytic reactivity. There are many representative models that explain the emerging catalytic activity of Au nanoclusters. It is widely accepted that the perimeter interface of Au/TiO2 is the reaction site for CO oxidation. However, the injection/extraction mechanism of electrons and the reaction process are not clarified by a comprehensive experimental description. In this study, we proposed a new method to simultaneously measuring topography, local contact potential difference (LCPD) and dipole moment distribution on TiO2(110) surface. In the experiment, the DC bias added with ac bias voltage is applied between the tip and sample. Three lock-in amplifiers are used to detect frequency shift of ω, 2ω and3ω. The contact potential difference is numerically calculated from the divided result of ω and 2ω signals and dipole moment is obtained from frequency shift of 3ω. The simultaneously measurement result of topography, LCPD and dipole moment images were obtained on TiO2(110) surface. The details will be reported in the meeting.

Biography

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Y J Li has completed her PhD from the University of Tsukuba, Japan during 1998-2001. From 2001-2003, she was a Research Fellow at Institute for Molecular Science, Okazaki, National Research Institutes, Japan. From 2004-2009, she worked as Visiting Associate Professor at Osaka University, Japan and from 2010-present, as an Associate Professor at Osaka University, Japan. She has published more than 70 papers in reputed journals.