• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Investigation of the surface potential of TiO2 (110) by frequency-modulation Kelvin probe force microscopy
【24h】

Investigation of the surface potential of TiO2 (110) by frequency-modulation Kelvin probe force microscopy

机译：通过调速开尔文探针力显微镜检查TiO2（110）的表面电位

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We investigate the surface potential distribution on a TiO2 (110)-1 x 1 surface by Kelvin probe force microscopy (KPFM) and atom-dependent bias-distance spectroscopic mapping. The experimental results demonstrate that the local contact potential difference increases on twofold-coordinated oxygen sites, and decreases on OH defects and fivefold-coordinated Ti sites. We propose a qualitative model to explain the origin of the surface potential of TiO2 (110). We qualitatively calculate the surface potential induced by chemical potential and permanent surface dipole. The calculated results agree with our experimental ones. Therefore, we suggest that the surface potential of TiO2 (110) is dominated not only by the permanent surface dipole between the tip apex atom and surface, but also by the dipoles induced by the chemical interaction between the tip and sample. The KPFM technique demonstrate the possibility of investigation of the charge transfer phenomenon on TiO2 surface under gas conditions. It is useful for the elucidation of the mechanism of the catalytic reactions.
机译：我们研究了Kelvin探针力显微镜（KPFM）和原子依赖性偏差光谱映射的TiO 2（110）-1 x 1表面上的表面电位分布。实验结果表明，局部接触电位差增加了双重协调的氧气位点，并降低了OH缺陷和五倍协调的Ti位点。我们提出了一种定性模型来解释TiO2的表面电位的起源（110）。我们定性地计算化学电位和永久性表面偶极子诱导的表面电位。计算结果与我们的实验结果一致。因此，我们建议TiO2（110）的表面电位不仅由尖端顶点原子和表面之间的永久表面偶极子构成，而且由尖端和样品之间的化学相互作用所引起的偶极子。 KPFM技术证明了在天然气条件下对TiO2表面上的电荷转移现象进行调查的可能性。它可用于阐明催化反应的机制。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号