摘要
为提高表面增强拉曼散射(Surface-enhanced Raman scattering,SERS)基底的性能,采用COMSOL Multiphysics仿真软件通过有限元法对两个相邻的纳米颗粒的模型进行仿真。仿真结果表明,当纳米颗粒半径一定时,增强因子随间距的增大而快速减小;当间距一定时,增强因子随半径的增大而增大,半径达到300 nm后,增强因子趋于稳定,且呈一定的下降趋势。同时,设计并构建了倒圆锥模型的SERS基底,仿真得到其增强因子为2.66×105,相比于倒金字塔模型(增强因子为1.57×105)具有更优异的性能。基于所得到的仿真结果对倒圆锥模型进行优化,银纳米颗粒间距从10 nm依次减小为5 nm,增强因子得到显著提高,极大地提高了表面增强拉曼散射基底的性能。
In order to improve the performance of surface-enhanced Raman scattering(SERS)substrate,the model of two adjacent nanoparticles was simulated by using the finite element method(FEM)with COMSOL Multiphysics software.The simulation results show that the enhancement factor decreases rapidly with the increase of the spacing when the particle radius is fixed,and increases with the increase of the radius when the spacing is fixed,and when the radius reaches 300 nm,the enhancement factor increases with the increase of the radius,the enhancement factor tended to be stable and showed a certain decreasing trend.At the same time,we designed and constructed a SERS substrate based on an inverted cone model,and the enhancement factor is 2.66×10^(5).The comparison with the inverted pyramid model(enhancement factor is 1.57×10^(5))shows that the inverted cone model has higher performance.According to the simulation results,we optimized the inverted cone model by changing the spacing of silver nanoparticles from 10 nm to 5 nm.The enhancement factor has been significantly improved,which greatly improved the performance of the SERS substrate.
作者
张学明
常畅
张舒淇
袁梦哲
王星乔
王力超
宋文轲
徐智谋
孙堂友
ZHANG Xueming;CHANG Chang;ZHANG Shuqi;YUAN Mengzhe;WANG Xingqiao;WANG Lichao;SONG Wenke;XU Zhimou;SUN Tangyou(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China;School of Information and Communication,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)
出处
《激光杂志》
CAS
北大核心
2023年第5期13-17,共5页
Laser Journal
基金
广西精密导航技术与应用重点实验室(No.DH202222)
华中科技大学大学生创新创业训练项目计划(No.GD2022142)。
关键词
拉曼散射
表面增强拉曼散射
有限元法
纳米颗粒
增强因子
raman scattering
surface enhancement of raman scattering
finite element method
nanoparticle
enhancement factor
