基于Drude-Lorentz模型的金银纳米颗粒光谱特征研究  

Research on the spectral characteristics of gold and silver nanoparticles based on Drude-Lorentz model

作　　者：朱圣清[1] 杨芳 ZHU Shengqing;YANG Fang(School of Chemistry and Chemical Engineering,Jiangsu University of Technology,Changzhou 213001,China;School of Mechanical Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院化学化工学院,江苏常州213001 [2]江苏理工学院机械工程学院,江苏常州213001

出　　处：《江苏理工学院学报》2022年第4期9-16,共8页Journal of Jiangsu University of Technology

基　　金：江苏省自然科学基金青年基金项目“基于贵金属纳米链表面等离激元效应的铜铟镓硒太阳能电池增效技术研究”(BK20181042);江苏理工学院研究生实践创新计划“金银复合纳米颗粒薄膜折射率传感特性研究”(XSJCX22_62)。

摘　　要：基于Drude-Lorentz模型,利用最小二乘法得到了金银纳米材料介电常数的最优表达式。结合Mie理论,系统研究了球形金银纳米颗粒的消光光谱、吸收光谱、散射光谱等特性,比较并分析了不同尺寸下金银纳米颗粒的散射消光比等光谱特性。研究表明:(1)随着金纳米颗粒尺寸的增大,散射作用随之加强,入射波长为529 nm时发生表面等离激元共振,半径为10 nm、20 nm、30 nm、40 nm、50 nm理想金纳米球体的散射消光比依次为0.76%、5.65%、12.81%、19.36%和37.13%;(2)银纳米颗粒对入射光的消光作用相对金纳米颗粒更为显著,散射作用的贡献比重更大,入射波长为415 nm时,半径依次为10 nm、20 nm、30 nm、40 nm、50 nm理想银纳米球体的散射消光比依次为17.85%、63.46%、85.44%、93.29%和96.45%,且随着入射波长的增加,散射消光比逐步提高。Based on Drude-Lorentz model,the optimal expression of dielectric constant formula of gold and silver nanomaterials is obtained by least square method.Combined with Mie theory,the characteristics of spherical gold and silver nanoparticles such as extinction spectrum,absorption spectrum and scattering spectrum are systematically studied,and the scattering extinction ratios of gold and silver nanoparticles with different sizes are compared and analyzed.The results show that:(1)With the increase of the size of gold nanoparticles,the scattering effect increases.When the incident wavelength is 529 nm,the surface plasmon resonance occurs.The scattering extinction ratios of ideal gold nanometer sphere with radius of 10 nm,20 nm,30 nm,40 nm and 50 nm are0.76%,5.65%,12.81%,19.36%and 37.13%,respectively;(2)The extinction effect of silver nanoparticles on incident light is more obvious than that of gold nanoparticles,and the contribution of scattering is larger.When the incident wavelength is 415 nm,the scattering extinction ratios of ideal silver nanometer sphere with radius of 10 nm,20 nm,30 nm,40 nm and 50 nm are 17.85%,63.46%,85.44%,93.29%and 96.45%,respectively.With the increase of incident wavelength,the scattering extinction ratio increases gradually.

关 键 词：Drude-Lorentz模型 MIE理论 纳米颗粒 消光光谱 太阳能电池 

分 类 号：O433[机械工程—光学工程]