双金属锥形光纤表面增强拉曼散射探针拉曼增强特性  

Raman Enhancement Characteristics of Bimetallic Tapered Optical Fiber Surface-Enhanced Raman Scattering Probe

作　　者：黄博 汪正坤 朱永[1] 张洁[1] Huang Bo;Wang Zhengkun;Zhu Yong;Zhang Jie(Key Laboratory of Optoelectronic Technology and System,Education Ministry of China,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51-58,共8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：为了提高金属纳米粒子在光纤表面的富集密度,同时提高光纤表面增强拉曼散射(SERS)复合结构拉曼增强特性的稳定性,提出一种双金属(金和银)锥形光纤SERS探针结构。首先,采用化学还原法制备出形貌均一的金银纳米粒子;然后,采用光诱导的方法实现双金属在锥形光纤上的富集。制备的光纤SERS探针表现出良好的实验效果:对罗丹明6G(R6G)检测到的最低浓度低至10-10mol/L;增强因子为2.07×10^(8);相较于单金属银光纤SERS探针,双金属样品的稳定性提高了7倍(96 h后)。Objective Surface-enhanced Raman scattering(SERS)is a powerful analytical tool that can provide molecular vibrational fingerprint information.Due to its unique analytical advantages,SERS has been widely applied in various fields such as biomedical research,environmental monitoring,and food analysis.During the development of SERS technology,silver nanoparticles have often been used as SERS substrates due to their excellent localized surface plasmon resonance properties.However,their susceptibility to oxidation poses a significant limitation in the construction of nano-probes for practical applications.In contrast,gold nanoparticles have better chemical stability and lower biotoxicity but relatively weaker Raman signal enhancement capability.Therefore,bimetallic SERS substrates combining gold and silver are characterized by high sensitivity and stability.Compared with traditional substrates,tapered optical fibers not only have the advantages of in-situ detection and remote signal transmission but also have great potential for enhancing laser reflection and improving light collection capability,which is beneficial for collecting weak Raman signals and achieving lower detection limits.Therefore,we proposed a simple and cost-effective bimetallic tapered optical fiber SERS probe.This probe utilized a light-induced method to deposit gold and silver nanoparticles on the surface of the tapered optical fiber,providing high sensitivity and good stability.Methods The bimetallic tapered optical fiber SERS probe was prepared by using a light-induced method in this study.First,the tapered fiber was prepared by using the fiber fusion tapering machine.After clamping the processed fiber onto the fiber holder,the fiber fusion tapering machine was started to initiate the tapering process.Once the machine stopped operating,two tapered optical fibers were obtained.Second,gold and silver nanoparticles with an approximate diameter of 50 nm were prepared by using a chemical reduction method.Finally,the bimetallic tapered optical fiber SE

关 键 词：散射 拉曼散射 双金属 锥形光纤 光诱导 

分 类 号：TN252[电子电信—物理电子学]