Preparation and Characterization of Hollow Ag Nanoparticles with Movable Au Cores Inside and Their Application to Surface-enhanced Raman Scattering

Chem. J. Chinese Universities

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Preparation and Characterization of Hollow Ag Nanoparticles with Movable Au Cores Inside and Their Application to Surface-enhanced Raman Scattering

LI Li, YANG Wu^*, GUO Hao, CHEN Zhong-Yu, ZHANG Ai-Ju, JIN Li-Li, CHEN Miao

Key Laboratory of Polymer Materials Related with Ecology and Environment of Ministry of Education College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2008-04-03 Revised:1900-01-01 Online:2008-11-10 Published:2008-11-10
Contact: YANG Wu

Abstract

Abstract: Core-shell structure of Au@SiO₂ nanoparticles and silver coated Au@SiO₂ nanoparticles(Au@SiO₂@Ag NPs) were prepared by a seed-mediated growth technique under shaking. Hollow Ag nanoparticles with a shell thickness of 30 nm and with movable Au cores of 30 nm diameter inside(Au@air@Ag NPs) were further obtained by dissolving silica shell within Au@SiO₂@Ag NPs by HF. The morphologies of those obtained nanoparticles were characterized by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The application of the as-prepared Au@air@Ag substrates in surface-enhanced Raman scattering(SERS) was investigated with Rhodamine B as a probe molecule. It was found that even though very low concentration of Rhodamine B adsorbed on the hollow nanoparticles showed a strong SERS effect. The results indicate that the Au@air@Ag NPs were ideal materials applied in SERS.

Key words: Core-shell structure, Au@air@Ag, Movable core, Hollow, Surfaced-enhanced Raman scattering

CLC Number:

O614.122

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LI Li, YANG Wu^*, GUO Hao, CHEN Zhong-Yu, ZHANG Ai-Ju, JIN Li-Li, CHEN Miao. Preparation and Characterization of Hollow Ag Nanoparticles with Movable Au Cores Inside and Their Application to Surface-enhanced Raman Scattering[J]. Chem. J. Chinese Universities, doi: .

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Preparation and Characterization of Hollow Ag Nanoparticles with Movable Au Cores Inside and Their Application to Surface-enhanced Raman Scattering

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