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Structure of Gold - Silver Nanoparticles

Godfrey, IJ; Dent, AJ; Parkin, IP; Maenosono, S; Sankar, G; (2017) Structure of Gold - Silver Nanoparticles. Journal of Physical Chemistry C , 121 (3) pp. 1957-1963. 10.1021/acs.jpcc.6b11186. Green open access

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Abstract

Nanoparticles with nominal structures of Au@Ag (core@shell) and Au@Ag@Au (core@shell@shell) were prepared using the sequential citrate reduction technique and characterized using routine characterization techniques, including transmission electron microscopy. X-ray absorption spectroscopy was then carried out on the samples, and extended X-ray absorption fine structure (EXAFS) analysis was used to determine the structure of the systems. The results of the routine techniques and the X-ray absorption spectroscopy were then compared. EXAFS analysis of the nanoparticles with the Au@Ag structure revealed very limited bimetallic interactions, supporting the assignment of a core@shell structure. EXAFS analysis of the nanoparticles with Au@Ag@Au structure showed an increased proportion of bimetallic interactions. Based on the colloid composition, the other characterization techniques and the chemistry of the system, these nanoparticles were interpreted as having an Au@Au/Ag-alloy structure. The EXAFS analyses corroborated the other characterization techniques and enabled the determination of the average-structure of the entire sample.

Type: Article
Title: Structure of Gold - Silver Nanoparticles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.jpcc.6b11186
Publisher version: http://dx.doi.org/10.1021/acs.jpcc.6b11186
Language: English
Additional information: Copyright © 2017 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1540678
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