纳米晶
铜
纳米材料
透射电子显微镜
纳米颗粒
催化作用
材料科学
原位
锌
化学工程
纳米技术
纳米尺度
氧化物
氧化铜
Atom(片上系统)
化学物理
化学
冶金
有机化学
计算机科学
嵌入式系统
工程类
作者
Per Lyngs Hansen,Jakob Birkedal Wagner,Stig Helveg,J.R. Rostrup-Nielsen,Bjerne S. Clausen,Henrik Topsøe
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2002-03-15
卷期号:295 (5562): 2053-2055
被引量:1096
标识
DOI:10.1126/science.1069325
摘要
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports. These are catalysts for methanol synthesis and hydrocarbon conversion processes for fuel cells. The nanocrystals undergo dynamic reversible shape changes in response to changes in the gaseous environment. For zinc oxide-supported samples, the changes are caused both by adsorbate-induced changes in surface energies and by changes in the interfacial energy. For copper nanocrystals supported on silica, the support has negligible influence on the structure. Nanoparticle dynamics must be included in the description of catalytic and other properties of nanomaterials. In situ microscopy offers possibilities for obtaining the relevant atomic-scale insight.
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