Article
Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms
Author/s | García Negrete, Carlos Andrés
Knappett, Benjamin R Schmidt, F.P Rojas Ruiz, Teresa Cristina Wheatley, Andrew E.H. Hofer, F Fernández Camacho, Alejandro |
Publication Date | 2015 |
Deposit Date | 2018-04-04 |
Published in |
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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 ... 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 |
Project ID. | CT-REGPOT-2011-1-285895
no. 312483 PIE 201460E018 CTQ2012-32519 PE2009-FQM-4554 TEP217 PE2012-TEP-862 EP/J500380/1 |
Citation | García Negrete, C.A., Knappett, B.R., Schmidt, F.P., Rojas Ruiz, T.C., Wheatley, A.E.H., Hofer, F. y Fernández Camacho, A. (2015). Island-type growth of Au–Pt heterodimers: direct visualization of misfit dislocations and strain-relief mechanisms. RSC Advances, 5, 1-7. |
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