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Issue 17, 2005
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Multishell bimetallic AuAg nanoparticles: synthesis, structure and optical properties

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Abstract

Core–shell and multishell bimetallic AuAg nanoparticles have been synthesized by successive reduction of metal salts with ascorbic acid on pre-made seeds in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB). The coverage of the seeds is extremely uniform, although in some cases deviations from a spherical shape are observed with the formation of nanorods or nanoprisms. The evolution of the optical properties as further metal layers are deposited is very dramatic and can be modelled using Mie theory for multilayer spheres. However, preliminary results using high-resolution STEM-XEDS elemental mapping suggest that the actual distribution of the two metals within the multilayer spheres may involve (partial) alloying of the metals.

Graphical abstract: Multishell bimetallic AuAg nanoparticles: synthesis, structure and optical properties

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Article information


Submitted
12 Jan 2005
Accepted
16 Feb 2005
First published
01 Mar 2005

J. Mater. Chem., 2005,15, 1755-1759
Article type
Paper

Multishell bimetallic AuAg nanoparticles: synthesis, structure and optical properties

B. Rodríguez-González, A. Burrows, M. Watanabe, C. J. Kiely and L. M. Liz Marzán, J. Mater. Chem., 2005, 15, 1755
DOI: 10.1039/B500556F

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