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Mechanistic Study on the Replacement Reaction between Silver Nanostructures and Chloroauric Acid in Aqueous Medium
Abstract
The replacement reaction between silver nanostructures and an aqueous HAuCl(4) solution has recently been demonstrated as a versatile method for generating metal nanostructures with hollow interiors. Here we describe the results of a systematic study detailing the morphological, structural, compositional, and spectral changes involved in such a heterogeneous reaction on the nanoscale. Two distinctive steps have been resolved through a combination of microscopic and spectroscopic methods. In the first step, silver nanostructure (i.e., the template) is dissolved to generate gold atoms that are deposited epitaxially on the surface of each template. Silver atoms also diffuse into the gold shell (or sheath) to form a seamless, hollow nanostructure with its wall made of Au-Ag alloys. The second step involves dealloying, a process that selectively removes silver atoms from the alloyed wall, induces morphological reconstruction, and finally leads to the formation of pinholes in the walls. Reaction temperature was found to play an important role in the replacement reaction because the solubility constant of AgCl and the diffusion coefficients of Ag and Au atoms were both strongly dependent on this parameter. This work has enabled us to prepare metal nanostructures with controllable geometric shapes and structures, and thus optical properties (for example, the surface plasmon resonance peaks could be readily shifted from 500 to 1200 nm by controlling the ratio between Ag and HAuCl(4)).
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Metadata
- Authors
- Sun, Y., & Xia, Y.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-03-01
- Volume
- 126
- Issue
- 12
- Pages
- 3892-3901
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2017662581
- Cited by
- 1,113
- References
- 2
- FWCI
- 24.56
- Type
- journal article
- Language
- en
- Open access
- closed
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