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Citation: 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, ;2014, 31(3): 323-327. doi: 10.3724/SP.J.1095.2014.30159 shu

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

ZHENG Yizhi ,
WANG Haishui ^,

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: WANG Haishui,
Received Date: 12 April 2013
Available Online: 15 July 2013
Fund Project: 国家自然科学基金(20873136)资助项目 (20873136)

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.
- silver nanoparticles,
- silica,
- core-shell,
- localized surface plasmon resonance,
- refractive index sensitivities
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