Imaging Nanostructural Modifications Induced by Electronic Metal-Support Interaction Effects at Au∥Cerium-Based Oxide Nanointerfaces
Imaging Nanostructural Modifications Induced by Electronic Metal-Support Interaction Effects at Au∥Cerium-Based Oxide Nanointerfaces
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DOI：
10.1021/nn301557u
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发表时间：
2012-08-01
期刊：
影响因子：
17.1
通讯作者：
Calvino, Jose J.
中科院分区：
文献类型：
--
作者：
Lopez-Haro, Miguel;Cies, Jose M.;Calvino, Jose J.
各种先进的（扫描）透射电子显微镜实验，进行像差校正设备，提供直接证据的微妙的结构变化发生在纳米级Aullceria氧化物界面，同意发生之间的电荷转移效应的减少支持和支持的金纳米粒子建议宏观技术。结构分析表明，当还原时，金纳米颗粒更紧密地结合在氧化铈载体上。这种结构的修改是伴随着平行的CO化学吸附能力的金纳米粒子，这是解释在精确的定量方面，由于在Aullcereo氧化物界面的周边的金原子的失活的钝化。
A variety of advanced (scanning) transmission electron microscopy experiments, carried out in aberration-corrected equipment, provide direct evidence about subtle structural changes taking place at nanometer-sized Aullceria oxide interfaces, which agrees with the occurrence of charge transfer effects between the reduced support and supported gold nanoparticles suggested by macroscopic techniques. Tighter binding of the gold nanoparticles onto the ceria oxide support when this is reduced is revealed by the structural analysis. This structural modification is accompanied by parallel deactivation of the CO chemisorption capacity of the gold nanoparticles, which is interpreted in exact quantitative terms as due to deactivation of the gold atoms at the perimeter of the Aullcerium oxide interface.