期刊
NANO LETTERS
卷 14, 期 11, 页码 6336-6341出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502762m
关键词
catalysis; nanometrology; aberration corrected STEM; quantitative ADF; platinum nanoparticles
类别
资金
- European Union Seventh Framework Programme [312483-ESTEEM2]
- U.K. EPSRC
- INFRASTRUKTUR Grant (NORTEM) program of the Research Council of Norway [197405]
- Engineering and Physical Sciences Research Council [1104171] Funding Source: researchfish
Heterogeneous nanoparticle catalyst development relies on an understanding of their structureproperty relationships, ideally at atomic resolution and in three-dimensions. Current transmission electron microscopy techniques such as discrete tomography can provide this but require multiple images of each nanoparticle and are incompatible with samples that change under electron irradiation or with surveying large numbers of particles to gain significant statistics. Here, we make use of recent advances in quantitative dark-field scanning transmission electron microscopy to count the number atoms in each atomic column of a single image from a platinum nanoparticle. These atom-counts, along with the prior knowledge of the face-centered cubic geometry, are used to create atomistic models. An energy minimization is then used to relax the nanoparticles 3D structure. This rapid approach enables high-throughput statistical studies or the analysis of dynamic processes such as facet-restructuring or particle damage.
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