Statistical distribution of single atoms and clusters of supported Au catalyst analyzed by global high-resolusion HAADF-STEM observation with morphological image-processing operation
Statistical distribution of single atoms and clusters of supported Au catalyst analyzed by global high-resolusion HAADF-STEM observation with morphological image-processing operation
复制标题
通过全局高分辨率 HAADF-STEM 观察和形态图像处理操作分析负载型 Au 催化剂的单原子和团簇的统计分布
DOI：
10.1093/jmicro/dfu001
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发表时间：
2014
期刊：
影响因子：
1.8
通讯作者：
A. Satsuma and N. Tanaka
中科院分区：
文献类型：
--
作者：
Yamamoto;S. Arai;A. Esaki;J. Ohyama;A. Satsuma and N. Tanaka
为了研究负载型金属催化剂，我们发展了一种单原子水平的电子显微镜和图像处理的定量粒度分析方法。用球差校正的高分辨率环状暗场扫描电子显微镜(HAADF-STEM)对含有亚纳米团簇和单个原子的负载型金(Au)催化剂进行了整体观察。为了从HAADF-STEM图像中充分提取Au团簇和单个原子的结构信息，采用了一种形态图像处理操作。所得平均颗粒尺寸与X射线吸收精细结构分析提供的平均信息估算的颗粒尺寸很好地吻合。结果表明，本文的HAADF-STEM图像分析方法可以定量测量被支撑的Au团簇和单个原子的粒度分布。
We have developed a quantitative particle size analytical method at the single atomic level employing electron microscopy and image processing for the investigation of supported metal catalysts. In the present study, a supported gold (Au) catalyst containing sub-nano clusters and individual atoms was globally observed by high-resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) using spherical aberration (Cs)-corrected TEM. To fully extract structural information of the Au clusters and individual atoms from the HAADF-STEM images, a morphological image-processing operation was applied. The resulting mean particle size was in good agreement with particle sizes estimated from average information provided by X-ray absorption fine structure analysis. It is demonstrated that the present HAADF-STEM image analysis gives a quantitative particle size distribution measurement of supported Au clusters and individual atoms.