期刊
NANO LETTERS
卷 15, 期 4, 页码 2711-2715出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00414
关键词
In situ TEM; flow cell; growth; platinum; nanoparticle
类别
资金
- US National Science Foundation [CHE-1213926]
- University of Illinois
- Department of Energy [DEFG02-01ER45923]
- Shen Fellowship from Department of Chemical and Biomolecular Engineering at University of Illinois
- NSF [DMR-1006077]
- U.S. Department of Energy, Office of Science [DE-AC02-06CH11357]
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006077] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1213926] Funding Source: National Science Foundation
A growth mode was revealed by an in situ TEM study of nucleation and growth of Au on Pt icosahedral nanoparticles. Quantitative analysis of growth kinetics was carried out based on real-time TEM data, which shows the process involves: (1) deposition of Au on corner sites of Pt icosahedral nanoparticles, (2) diffusion of Au from corners to terraces and edges, and (3) subsequent layer-by-layer growth of Au on Au surfaces to form Pt@Au core-shell nanoparticles. The in situ TEM results indicate diffusion of Au from corner islands to terraces and edges is a kinetically controlled growth, as evidenced by a measurement of diffusion coefficients for these growth processes. We demonstrated that in situ electron microscopy is a valuable tool for quantitative study of nucleation and growth kinetics and can provide new insight into the design and precise control of heterogeneous nanostructures.
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