基于自组装技术的柔性SERS基底拉曼增强研究  

Raman Enhancement of Flexible SERS Substrate Based on Self-Assembly Technology

作　　者：汤智谋 吕振寅 张洁[1] Tang Zhimou;LüZhenyin;Zhang Jie(Key Laboratory of Optoelectronic Technology&Systems,Ministry of Education,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044

出　　处：《光学学报》2023年第21期302-308,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62175023);重庆市杰出青年基金(cstc2019jcyjjqX0018)。

摘　　要：利用自组装技术将单层银纳米粒子修饰到Whatman No.1滤纸表面,成功制备了柔性表面增强拉曼散射(SERS)基底。实验结果表明:当银粒子尺寸为20 nm时,拉曼增强性能达到最佳。采用此参数制备的SERS基底对罗丹明6G(R6G)分子的检测极限为10^(−10)mol/L,最大增强因子为5.66×10^(8),相对标准偏差(RSD)为10.9%。同时,该柔性基底能够准确地识别和区分多种目标分子,并具有良好的柔软性和可恢复性。此外,还结合基底的扫描电子显微镜(SEM)表征情况,利用时域有限差分(FDTD)仿真软件对样品的电磁场增强特性进行了数值分析,并对其与实验结果进行了对比。Objective The ability to perform on-site chemical analysis has become increasingly crucial across various domains in recent times.Surface-enhanced Raman scattering(SERS)technology offers a simple and portable detection approach,making it highly promising for chemical analysis compared with conventional methods such as mass spectrometry and liquid chromatography.SERS technology can be categorized into two types based on the substrate used:flexible and rigid SERSs.Conventional rigid substrates have limitations in terms of universality,hardness,and fragility,thereby restricting their application in certain specialized environments.Conversely,paper-based SERS substrates are flexible and are easily fabricated.They exhibit properties such as flexibility,stretchability,and foldability,thereby expanding the potential application scenarios of SERS technology.The existing methods for fabricating paper-based SERS substrates use various types of substrates such as spray coating,direct immersion,and inkjet printing.However,these techniques require improvements in terms of performance,procedure simplicity,and limitations of the fabrication conditions.Furthermore,there is a need for further experimental analysis and exploration of SERS substrates,including multimolecule detection and investigation of flexible substrate properties,which can provide valuable insights into the application potential of SERS substrates.In this study,a liquid-liquid interface self-assembly technique is utilized to optimize SERS substrates by controlling the size of silver nanoparticles(AgNPs).In addition,the multimolecular detection ability and flexibility characteristics of SERS substrates are explored,and the detection performance of the substrate to be tested is discussed.Methods We used a liquid-liquid interface self-assembly technique to fabricate flexible SERS substrates by transferring a monolayer of AgNPs onto the surface of Whatman No.1 filter paper.The experimental procedure comprised the following steps.1.First,we prepared a silver sol sol

关 键 词：自组装 银纳米粒子 柔性基底 表面增强拉曼散射 

分 类 号：O433[机械工程—光学工程]