Ag@Au复合纳米颗粒薄膜的折射率传感特性研究  

Study on Refractive Index Sensing Properties of Gold and Silver Composite Nanoparticle Films

作　　者：杨芳 朱圣清[2] 黄小丹 朱云峰[2] 周建 颜玉荣 YANG Fang;ZHU Shengqing;HUANG Xiaodan;ZHU Yunfeng;ZHOU Jian;YAN Yurong(School of Mechanical Engineering,Jiangsu University of Technology,Jiangsu Changzhou 213001,China;School of Chemistry and Chemical Engineering,Jiangsu University of Technology,Jiangsu Changzhou 213001,China;Department of Information Engineering,Changzhou Vocational Institute of Mechatronic Technology,Jiangsu Changzhou 213164,China;Jiangsu Xiangyuan Chemical Co.,Ltd,Jiangsu Suzhou 215138,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001 [2]江苏理工学院化学化工学院,江苏常州213001 [3]常州机电职业技术学院信息工程学院,江苏常州213164 [4]苏州湘园新材料股份有限公司,江苏苏州215138

出　　处：《河南大学学报(自然科学版)》2025年第1期76-87,共12页Journal of Henan University:Natural Science

基　　金：江苏省自然科学基金青年基金项目(BK20181042);江苏理工学院研究生实践创新计划(XSJCX22_62)

摘　　要：Ag纳米颗粒由于具有显著的表面等离激元特性,可作为折射率传感关键材料,广泛应用于化学催化、信息传感、医用生物、新能源等领域.然而,Ag纳米颗粒在有氧化性介质环境下容易被氧化而失去材料的原有高灵敏度特征.本文提出了新的岛状Ag@Au复合纳米颗粒结构,这种结构由岛状Ag纳米颗粒和外层Au壳构成.利用有限时域差分法(FDTD),系统研究了不同结构参数下的折射率传感性能.结果表明岛状Ag@Au纳米颗粒薄膜的共振峰强烈依赖纳米颗粒的尺寸和周围介质的折射率.随着Ag@Au复合纳米颗粒尺寸的增大,共振峰逐渐红移,局域电场强度可增至入射场强的18倍,且复合材料的折射率传感灵敏度受Au壳厚度和Ag内核大小影响.最优条件下(Ag核半径为50 nm,Au壳厚度为3 nm),Ag@Au复合纳米颗粒薄膜折射率灵敏度达可达155.8 nm/RIU.本文提出的Ag@Au复合纳米颗粒薄膜,性能优于纯Ag材料指标,且外层的Au壳使整体材料免受环境的氧化、腐蚀.这种材料有望作为折射率传感关键材料,应用于介质环境的检测.Due to their significant surface plasmon characteristics,silver nanoparticles can be used as key materials for refractive index sensing,which are widely used in chemical catalysis,information sensing,medical biology,new energy and other fields.However,silver nanoparticles are easily oxidized in oxidizing media environments,and the high sensitivity characteristics of the material are lost.In this paper,an Ag@Au composite nanoparticle structure for refractive index sensing was proposed.This structure is composed of island shaped silver nanoparticles and an outer layer of gold shell.The refractive index sensing performance under different structural parameters was systematically studied using the Finite Difference Time Domain(FDTD)method.The results indicate that the resonance peak of the island-shaped Ag@Au nanoparticle thin films strongly depends on the size of the nanoparticles and the refractive index of the surrounding medium.The resonance peak of Ag@Au composite nanoparticles are gradually red-shifted with the increase of size,and the local electric field strength of island-shaped silver nanoparticles can be increased to 18 times the incident field strength.Moreover,the refractive index sensing sensitivity of composite materials is affected by the thickness of the gold shell and the size of the silver core.Under optimal conditions(silver core radius is 50 nm,gold shell thickness is 3 nm),the refractive index sensitivity of composite nanoparticle thin films can reach 155.8 nm/RIU.The proposed Ag@Au composite nanoparticle film in this paper has better index parameters than pure silver candidate,and it is difficult to be oxidized and corroded.Therefore,it's expected to be used as a key material for refractive index sensing in the detection of medium environment.

关 键 词：局域表面等离激元 折射率传感 纳米颗粒薄膜 时域有限差分法 消光光谱 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]