期刊
SMALL METHODS
卷 6, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200171
关键词
amorphous cluster; growth; in situ transmission electron microscopy; nanocrystals; nucleation
资金
- National Key Research and Development Program of China [2018YFA0703700]
- National Natural Science Foundation of China [51971025, 12034002, 11974041]
- Beijing Natural Science Foundation [2212034]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-075A1]
This study visually recorded the complete evolution process of solid-phase chloroplatinic acid during the electron beam irradiation triggered reduction and nucleation of platinum nanocrystals using aberration-corrected environmental transmission electron microscopy. The research found that there is a critical size of approximately 2.0 nm, representing the start of crystallization, during the formation of nanocrystals.
Understanding the mechanism of nucleation and growth of nanocrystals is crucial for designing and regulating the structure and properties of nanocrystals. However, the process from molecules to nanocrystals remains unclear because of the rapid and complicated dynamics of evolution under reaction conditions. Here, the complete evolution process of solid-phase chloroplatinic acid during the electron beam irradiation triggered reduction and nucleation of platinum nanocrystals is recorded. Aberration-corrected environmental transmission electron microscopy is used for direct visualization of the dynamic evolution from H2PtCl6 to Pt nanocrystals at the atomic scale, including the formation and growth of amorphous clusters, crystallization, and growth of clusters, and the ripening of Pt nanocrystals. At the first two stages, there exists a critical size of approximate to 2.0 nm, which represents the start of crystallization. Crystallization from the center and density fluctuation are observed in the second stage of the crystallization of a few clusters with a size obviously larger than the critical size. The work provides valuable information to understand the kinetics of the early stage of nanocrystal nucleation and crystallization at atomic scale.
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