银/二氧化硅核壳纳米颗粒的制备及其壳层厚度对其光学性质的影响

doi:10.3724/SP.J.1095.2014.30159

摘要/Abstract

摘要： 通过溶胶-凝胶法，制备了银/二氧化硅核壳材料（Ag@SiO2），对SiO2壳层厚度进行了有效调控，并系统研究了壳层厚度对银的等离子体共振峰（LSPR）以及对折射率灵敏度（RIS）的影响。研究结果表明，随SiO2壳层包覆厚度的增加，银纳米颗粒的LSPR吸收峰呈现先红移后蓝移的规律。对于粒径为50 nm的银纳米颗粒，当SiO2壳层达到65 nm时，LSPR最大吸收波长为465 nm。进一步增加SiO2壳层厚度，LSPR发生蓝移并且强度变弱，当SiO2壳层达到120 nm时，LSPR吸收峰已无法清晰辨认。研究了Ag@SiO2材料的RIS效应，发现随着SiO2厚度的增大RIS效应逐渐变小。

关键词: 银纳米, 二氧化硅, 核壳结构, 等离子体吸收峰, 折射率灵敏度

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

中图分类号:

O614.1

郑义智, 王海水. 银/二氧化硅核壳纳米颗粒的制备及其壳层厚度对其光学性质的影响[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30159.

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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