Atom-resolved imaging of dynamic shape changes in supported copper nanocrystals

被引：1049

作者：

Hansen, PL

Wagner, JB

Helveg, S

Rostrup-Nielsen, JR

Clausen, BS

Topsoe, H

机构：

[1] Haldor Topsoe Res Labs, DK-2800 Lyngby, Denmark

[2] Univ Copenhagen, NBlfAFG, DK-2100 Copenhagen O, Denmark

来源：

SCIENCE | 2002年 / 295卷 / 5562期

关键词：

D O I：

10.1126/science.1069325

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

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.

引用

页码：2053 / 2055

页数：3

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