Electron holographic 3-D nano-analysis of Au/TiO2 catalyst at interface.

Electron holographic 3-D nano-analysis of Au/TiO2 catalyst at interface.
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Au/TiO2 催化剂界面的电子全息 3D 纳米分析。

DOI:
10.1093/jmicro/52.1.21
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发表时间:
2003
期刊:
Journal of electron microscopy
影响因子:
--
通讯作者:
M. Kohyama
M. Kohyama
中科院分区:
--
文献类型:
--
作者:
S. Ichikawa;T. Akita;M. Okumura;M. Haruta;Koji Tanaka;M. Kohyama

文献摘要

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通过电子全息术和高分辨率电子显微镜分析了 TiO2 负载的金催化剂的三维 (3-D) 纳米结构。在金颗粒尺寸(高度)>4 nm 的情况下,金颗粒在 TiO2 上的接触角往往>90 度,而对于高度<2 nm 的金颗粒,它往往<90 度。随着颗粒尺寸的减小,形态的变化增加了 Au/TiO2 界面的周长。 3-D 结构的这种变化应归因于界面处电子结构的变化。研究发现,电子全息术可以在原子水平上进行 3D 分析,并且可以有效地分析纳米结构颗粒。
Three-dimensional (3-D) nanostructures of gold catalysts supported on TiO2 were analysed by electron holography and high-resolution electron microscopy. The contact angle of the gold particle on TiO2 tended to be >90 degrees in the case of gold particles with a size (height) of >4 nm and it tended to be <90 degrees for gold particles with a height of <2 nm. The change in morphology increases the perimeter at the Au/TiO2 interface as the particle size decreases. This change in 3-D structure should be attributed to a change in electronic structure at the interface. It was found that electron holography enabled 3-D analysis at the atomic level and was effective for analysing nanostructured particles.