AgNPs/CNTs复合结构自标定拉曼增强特性  

Self-Calibration Raman Enhancement Characteristics of Silver Nanoparticles/Carbon Nanotubes Composite Structure

作　　者：张晓蕾 蒋杰 赖春红 王泽渌 Zhang Xiaolei;Jiang Jie;Lai Chunhong;Wang Zelu(College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Postdoctoral Research Center of Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065 [2]重庆邮电大学光电信息感测与传输技术重庆市重点实验室博士后科研工作站,重庆400065

出　　处：《中国激光》2024年第19期285-292,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金项目(62105050);重庆市教育委员会科学技术研究项目(KJQN202000648);重庆市博士后特别资助项目(2021XM3055);重庆邮电大学博士启动资金项目(A2019-95)。

摘　　要：利用时域有限差分(FDTD)技术对银纳米粒子/碳纳米管(AgNPs/CNTs)复合结构和银纳米粒子结构进行了电磁仿真分析,仿真结果表明,复合结构的电磁增强因子比银纳米粒子结构提高了约1倍。采用化学自组装方法制备了AgNPs/CNTs复合结构,并采用扫描电镜对其进行了表征,表征结果显示,碳纳米管上的银纳米粒子分布得比较均匀,覆盖范围广。以罗丹明6G(R6G)和孔雀石绿(MG)为待测分子进行了拉曼自标定实验,得到了不同浓度下R6G和MG的拉曼光谱,并根据归一化k值法得出R6G和MG待测分子的k值线性拟合度均达到95%以上,实现了AgNPs/CNTs复合结构的SERS自标定检测。Objective Due to its many advantages,including low detection limits,high resolution,and minimal interference from water,enabling the real-time detection of trace substances,surface-enhanced Raman scattering(SERS)has garnered considerable attention and has been applied to various fields,including physical chemistry,biomedical science,and environmental monitoring.However,challenges remain for achieving quantitative analysis using SERS,primarily due to the uncertainties in the number of target molecules adsorbed on the enhancement substrate,uneven electromagnetic enhancement caused by the inherent nonuniformity of metal nanostructures,and molecular orientation fluctuations induced by chemical interactions.Currently,internal standard methods are primarily used for quantitative analysis.Internal standard methods involve the addition of internal standards or markers to achieve quantitative detection of analytes,partly addressing signal fluctuation issues.However,limitations such as the choice of internal standards,substrate materials,and preparation processes constrain their widespread practical applications.Carbon nanotubes(CNTs)exhibit distinctive 2D Raman characteristic peaks around 2696 cm^(-1),far from the characteristic peaks of common probe molecules,making them natural internal standards for SERS calibration detection.In addition,when the strong electromagnetic enhancement effect of silver nanoparticles(AgNPs)is leveraged,the combination of CNTs and AgNPs can synergistically enhance performance.Therefore,in this study,a chemical self-assembly method was employed to prepare AgNPs/CNTs composite structures.Rhodamine 6G and malachite green were used as probe molecules in Raman self-calibration experiments to investigate the self-calibrated Raman enhancement characteristics of AgNPs/CNTs composite structures.Methods First,an electromagnetic simulation using finite-difference time-domain(FDTD)solutions was employed to analyze the structures of AgNPs/CNTs composite structures and AgNPs structures.SERS substrates base

关 键 词：表面增强拉曼散射 碳纳米管 复合结构 自标定 

分 类 号：O657.3[理学—分析化学]