[16p-2U-1~12] 6.6 Probe Microscopy

▲ [16p-2U-5] Investigation of local contact potential difference and local dipole moment on TiO₂(110) surface by SCM

〇HUANFEI WEN¹, Masahide Suesada¹, Yanjun Li¹, Yasuhiro Sugawara¹ (1.Osaka Univ.)

Keywords:TiO2(110),LCPD,differential capacitance

Au/rutile TiO₂(110) surfaces display extremely high catalytic reactivity and have been model to investigate the mechanism of the CO oxidation reaction [1]. Excess electrons produced by the formation of defects significantly play an important role for the adsorption of Au nanoclusters and catalytic reaction process. However, the injection/extraction mechanism of electrons and the reaction process are not clarified by a comprehensive experimental description. Furthermore, the local contact potential difference (LCPD) with atomic resolution hasn’t been obtained on TiO₂(110) surface. Electrostatic capacitance has a one-on-one relationship to the dipole moments. Dipole moment distribution can be observed by the measurement of capacitance, and it is very useful to understand the catalytic reaction process. In this study, we simultaneously measure LCPD and differential capacitance () with atomic resolution on TiO₂(110) surfaces by scanning capacitance microscopy (SCM).