Preparation of Silver/Silica Composite Core-shell Nanoparticles and Influence of Shell Thickness on Optical Properties

doi:10.3724/SP.J.1095.2014.30159

Chinese Journal of Applied Chemistry

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Preparation of Silver/Silica Composite Core-shell Nanoparticles and Influence of Shell Thickness on Optical Properties

ZHENG Yizhi, WANG Haishui^*

(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China)

Received:2013-04-02 Revised:2013-07-13 Published:2014-03-10 Online:2014-03-10
Contact: Hai-Shui Wang
Supported by:
Supported by Natural Science Foundation of China(No.20873136)

Abstract

Abstract: Silver/silica composite core-shell nanoparticles(Ag@SiO2) with different silica shell thickness were prepared by sol-gel technology. Their localized surface plasmon resonance(LSPR) properties and refractive index sensitivities(RIS) were studied. With increasing of silica shell thickness, LSPR peak first got a red-shift. When silica shell thickness was 65 nm, the maximal shift about 50 nm had been reached. With further increase of shell thickness, LSPR peak shown blue-shift. LSPR peak became illegible when the shell thickness reached 120 nm. We also observed that RIS of silver nanoparticles decreased with increasing shell thickness.

Key words: silver nanoparticles, silica, core-shell, localized surface plasmon resonance, refractive index -sensitivities

CLC Number:

O614.1

ZHENG Yizhi, WANG Haishui*. Preparation of Silver/Silica Composite Core-shell Nanoparticles and Influence of Shell Thickness on Optical Properties[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30159.

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Preparation of Silver/Silica Composite Core-shell Nanoparticles and Influence of Shell Thickness on Optical Properties

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