Growth of Au on Pt Icosahedral Nanoparticles Revealed by Low-Dose in Situ TEM

Jianbo Wu, Wenpei Gao, Jianguo Wen, Dean J. Miller, Ping Lu, Jian Min Zuo, Hong Yang

Research output: Contribution to journalReview article

Abstract

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. (Graph Presented).

Original languageEnglish (US)
Pages (from-to)2711-2715
Number of pages5
JournalNano letters
Volume15
Issue number4
DOIs
StatePublished - Apr 8 2015

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Keywords

  • In situ TEM
  • flow cell
  • growth
  • nanoparticle
  • platinum

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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