Analytical TEM observation of Au nano-particles on cerium oxide
Analytical TEM observation of Au nano-particles on cerium oxide
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DOI：
10.1016/j.cattod.2006.05.010
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发表时间：
2006-09-30
期刊：
影响因子：
5.3
通讯作者：
Haruta, Masatake
中科院分区：
文献类型：
--
作者：
Akita, Tomoki;Okumura, Mitsutaka;Haruta, Masatake
利用透射电子显微镜（TEM）观察了CeO 2负载Au纳米粒子的结构变化。在TEM观察期间观察到Au颗粒的快速形状变化，例如在CeO 2衬底上逐层收缩至单原子层，而接触直径没有大的变化。电子束辐照实验表明，Au颗粒的形状变化与CeO 2的氧化态或氧空位密度有关，其中氧的快速解吸和吸附以及氧空位的有序化被精确地确定。研究还发现，强电子束照射还原和随后的氧化产生CeO 2-x包裹Au颗粒。(C)2006 Elsevier B. V.保留所有权利。
The structure changes of Au nanoparticles supported on CeO2 were observed by using an analytical transmission electron microscope (TEM). The rapid shape change of a Au particle was observed during TEM observation, such as shrinking layer by layer down to a mono-atomic layer on the CeO2 substrate with no large change of a contact diameter. The electron beam irradiation experiment revealed that the shape change of a Au particle is concerning with the oxidation state or the density of oxygen vacancies of CeO2, where the rapid desorption and adsorption of oxygen and the ordering of oxygen vacancies were precisely identified. It was also found that the reduction by strong electron beam irradiation and subsequent oxidation generate the encapsulation of Au particles by CeO2-x. (C) 2006 Elsevier B.V. All rights reserved.