Ag/Si核壳结构纳米颗粒粒子系的吸收特性研究  

The Absorption Characteristics of Ag/Si Core-Shell Nanoparticle Clouds

作　　者：朱群志 蒋瑜毅 

机构地区：[1]上海电力学院能源与机械工程学院,上海200090

出　　处：《光散射学报》2017年第3期222-227,共6页The Journal of Light Scattering

基　　金：国家自然科学基金(51576119);上海市教育委员会科研创新项目(13ZZ130);上海市科学技术委员会科技创新专项项目(14DZ1207106)

摘　　要：当电子振动频率与入射光的频率相同时,部分金属纳米颗粒可以在其表面激发局部表面等离子共振效应(LSPR),该波长下颗粒的吸收增强。这种效应也被应用于增强拉曼光谱信号的强度。本文研究了以Ag为外壳材料、Si为内核的核壳结构纳米颗粒粒子系的吸收特性。采用时域有限差分方法求解了颗粒随机分布粒子系的吸收率,分析了颗粒体积分数、内核外壳尺寸、椭球化等因素对粒子系吸收特性的影响以及对吸收峰的调控作用。Localized surface plasmon resonance（LSPR）can be excited on metal nanoparticles.The LSPR occurs when the oscillation frequency of electrons is equal to that of the incident light.At this frequency,the absorption of metal nanoparticles can be strengthened.The LSPR effect has been applied to the surface-enhanced Raman scattering（SERS）.In this study,absorption of Ag-Si core-shell nanoparticle clouds is investigated.The finite-difference time-domain method is applied to obtain the absorption of particulate media,with core-shell nanoparticle randomly distributed.Effects of particle volume fraction,core and shell radii,spherical and ellipsoidal shapes are analyzed.Tuning of absorption peaks by different factors is also discussed.

关 键 词：LSPR 核壳结构 银 硅 SERS 

分 类 号：TK511.4[动力工程及工程热物理—热能工程]