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Investigation of tunneling current and local contact potential difference on the TiO2(110) surface by AFM/KPFM at 78K

机译:AFM / KPFM在78K时对TiO2(110)表面隧道电流和局部接触电位差的研究

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摘要

We propose a new multi-image method for obtaining the frequency shift, tunneling current and local contact potential difference (LCPD) on a TiO2(110) surface with atomic resolution. The tunneling current image reveals rarely observed surface oxygen atoms contrary to the conventional results. We analyze how the surface and subsurface defects affect the distribution of the LCPD. In addition, the subsurface defects are observed clearly in the tunneling current image, in contrast to a topographic image. To clarify the origin of the atomic contrast, we perform site-dependent spectroscopy as a function of the tip-sample distance. The multi-image method is expected to be widely used to investigate the charge transfer phenomena between the nanoparticles and surface sites, and it is useful for elucidating the mechanisms of catalytic reactions.
机译:我们提出了一种新的多图像方法,用于以原子分辨率获得TiO2(110)表面上的频移,隧道电流和局部接触电位差(LCPD)。 隧道电流图像揭示了与常规结果相反的表面氧原子很少。 我们分析了表面和地下缺陷如何影响LCPD的分布。 另外,与地形图像相比,在隧道电流图像中清楚地观察到地下缺陷。 为了澄清原子对比的来源,我们将站点依赖性光谱学进行作为尖端样本距离的函数。 预计多图像方法将被广泛用于研究纳米颗粒和表面位点之间的电荷转移现象,并且可用于阐明催化反应的机制是有用的。

著录项

  • 来源
    《Nanotechnology》 |2017年第10期|共6页
  • 作者单位

    Osaka Univ Grad Sch Engn Dept Appl Phys 2-1 Yamadaoka Suita Osaka 5650871 Japan;

    Osaka Univ Grad Sch Engn Dept Appl Phys 2-1 Yamadaoka Suita Osaka 5650871 Japan;

    Osaka Univ Grad Sch Engn Dept Appl Phys 2-1 Yamadaoka Suita Osaka 5650871 Japan;

    Osaka Univ Grad Sch Engn Dept Appl Phys 2-1 Yamadaoka Suita Osaka 5650871 Japan;

    Osaka Univ Grad Sch Engn Dept Appl Phys 2-1 Yamadaoka Suita Osaka 5650871 Japan;

    Natl Ctr Nanosci &

    Technol CAS Ctr Excellence Nanosci CAS Key Lab Standardizat &

    Measurement Nanotechno Beijing 100190 Peoples R China;

    Natl Ctr Nanosci &

    Technol CAS Ctr Excellence Nanosci CAS Key Lab Standardizat &

    Measurement Nanotechno Beijing 100190 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    tunneling current; local contact potential difference; rutile TiO2(110); AFM; KPFM;

    机译:隧道电流;局部接触电位差;金红石TiO2(110);AFM;KPFM;

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