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https://hdl.handle.net/10119/11456
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| Title: | Chemical Stabilization of Gold Coated by Silver Core-Shell Nanoparticles via Electron Transfer |
| Authors: | Shankar, Cheshta
Dao, Anh T N
Singh, Prerna
Higashimine, Koichi
Mott, Derrick M
Maenosono, Shinya |
| Issue Date: | 2012-05-28 |
| Publisher: | Institute of Physics and IOP Publishing Limited |
| Magazine name: | Nanotechnology |
| Volume: | 23 |
| Number: | 24 |
| Start page: | 24570 |
| DOI: | 10.1088/0957-4484/23/24/245704 |
| Abstract: | Silver nanoparticles are notoriously susceptible to oxidation, yet gold nanoparticles coated in silver exhibit a unique electronic interaction that occurs at the interface of the two metals, leading to enhanced stability properties for the silver shell. In order to probe the phenomenon, the stability of gold nanoparticles coated by silver was studied in the presence of various chloride-containing electrolytes. It was found that a critical silver shell thickness of approximately 1 nm exists that cannot be oxidatively etched from the particle surface: this is in contrast to the observation of complete oxidative etching for monometallic silver nanoparticles. The results are discussed in terms of particle composition, structure and morphology before and after exposing the particles to the electrolytes. Raman analysis of the reporter molecule 3-amino-1,2,4-triazole-5-thiol adsorbed to the particle surface illustrates the feasibility of using gold coated by silver nanoparticle probes in sensing applications that require the presence of high levels of salt. The results provide insight into the manipulation of the electronic and stability properties for gold and silver based nanoparticles. |
| Rights: | Copyright (C) Institute of Physics and IOP Publishing Limited 2012. This is the author-created version of Institute of Physics and IOP Publishing Limited, Cheshta Shankar, Anh T N Dao, Prerna Singh, Koichi Higashimine, Derrick M Mott and Shinya Maenosono, Nanotechnology, 23(24), 2012, 24570. http://dx.doi.org/10.1088/0957-4484/23/24/245704 |
| URI: | https://hdl.handle.net/10119/11456 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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