Issue 31, 2011

Pt nanocrystal evolution in the presence of Au(iii)-salts at room temperature: spontaneous formation of AuPt heterodimers

Abstract

Room temperature synthesis of AuPt heterodimers is reported using a simple protocol. The role of oleylamine and Pt NCs in the reduction and nucleation of Au has been investigated. There are two unique aspects in this synthesis. Firstly, the synthesis was conducted at room temperature, which enabled the heterodimer growth to progress at a slower rate and thus allowed monitoring of the Au nucleation process. Secondly, these conditions allowed epitaxial growth with no crystal modification at the Au–Pt interphase. The presence of Pt NC seeds markedly accelerated the reaction, serving both as nucleation platforms and as an initial catalytic reducer of the Au ions in solution. The growth of Au on Pt NCs was monitored at different times by UV-vis, HRTEM and XRD.

Graphical abstract: Pt nanocrystal evolution in the presence of Au(iii)-salts at room temperature: spontaneous formation of AuPt heterodimers

Supplementary files

Article information

Article type
Paper
Submitted
20 Jan 2011
Accepted
23 Mar 2011
First published
26 Apr 2011

J. Mater. Chem., 2011,21, 11518-11523

Pt nanocrystal evolution in the presence of Au(III)-salts at room temperature: spontaneous formation of AuPt heterodimers

S. I. Lim, M. Varon, I. Ojea-Jiménez, J. Arbiol and V. Puntes, J. Mater. Chem., 2011, 21, 11518 DOI: 10.1039/C1JM10313J

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