Analytical TEM study on structural changes of Au particles on cerium oxide using a heating holder
Analytical TEM study on structural changes of Au particles on cerium oxide using a heating holder
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DOI：
10.1016/j.cattod.2007.01.014
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发表时间：
2007-04
期刊：
影响因子：
5.3
通讯作者：
T. Akita;Koji Tanaka;M. Kohyama;M. Haruta
中科院分区：
文献类型：
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作者：
T. Akita;Koji Tanaka;M. Kohyama;M. Haruta
利用带有样品加热保持器的分析透射电子显微镜（TEM）观察了CeO2负载Au纳米粒子的结构变化。在原子尺度上成功地观察到了Au粒子在CeO2上的碎裂和生长过程。高温下对Au颗粒的原位观察表明，CeO2上的Au颗粒是通过表面扩散的Ostwald熟化过程生长的。在加热过程中还观察到CeO2上的铱颗粒以进行比较。Au颗粒的生长方式与Ir颗粒的生长方式有很大不同。
The structure changes of Au nano-particles supported on CeO2were observed by using an analytical transmission electron microscope (TEM) with a specimen heating holder. The disintegration and growth of Au particles on CeO2were successfully observed in the atomic scale. In situ observation of Au particles at elevated temperature reveals that the Au particles on CeO2grow by Ostwald ripening process through surface diffusion. Iridium particles on CeO2were also observed during the heating process for comparison. The growth mode of Au particles is quite different from that of Ir.