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Issue 68, 2015
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Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

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Abstract

Structural and analytical characterization related to the formation mechanism of Au–Pt heterodimers from polyhedral Pt nanocrystals is reported. The observation of specific lattice strain effects and the emergence of misfit dislocations point to the relevance of the Stranski–Krastanov growth mode as a means of explaining the previously reported dimerisation reaction between Au and Pt. Two size-dependent strain relief mechanisms were identified. For dimers grown from 4.7 nm seeds, the mechanism is related to bulk lattice strain accumulation at {111} planes along with lattice relaxation effects on other crystalline planes. However, for dimers grown from 11.2 nm seed sizes, the formation of misfit dislocations proved to be a highly efficient mechanism by which to release interface mismatch strain. Nanoscale chemical mapping at Au–Pt interfaces also revealed Au–Pt alloying to be unlikely under the mild temperature conditions employed in this work for Au–Pt heterodimer synthesis.

Graphical abstract: Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

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Publication details

The article was received on 25 May 2015, accepted on 15 Jun 2015 and first published on 15 Jun 2015


Article type: Paper
DOI: 10.1039/C5RA09808D
Citation: RSC Adv., 2015,5, 55262-55268
  • Open access: Creative Commons BY license
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    Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms

    C. A. García-Negrete, B. R. Knappett, F. P. Schmidt, T. C. Rojas, A. E. H. Wheatley, F. Hofer and A. Fernández, RSC Adv., 2015, 5, 55262
    DOI: 10.1039/C5RA09808D

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