银纳米片在无纺布纤维上的可控组装及其SERS效应  

Controllable Assembling of Silver Nanosheets on Non-woven Fabric Fibers and Its SERS Effect

作　　者：李奇 田杜 陈韶云[1] 钟敏[1] 胡成龙[1] 陈建 LI Qi;TIAN Du;CHEN Shaoyun;ZHONG Min;HU Chenglong;CHEN Jian(Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,School of Chemical and Environmental Engineering,Jianghan University,Wuhan 430056,China;Instrumental Analysis and Research Center,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]江汉大学光电化学材料与器件教育部重点实验室,化学与环境工程学院,武汉430056 [2]中山大学测试中心,广州510275

出　　处：《高等学校化学学报》2021年第3期736-744,共9页Chemical Journal of Chinese Universities

基　　金：武汉市科技局项目(批准号:2019010701011384);国家自然科学基金(批准号:51973244)资助.

摘　　要：以无纺布(NWF)为支撑基体,采用两步化学合成法在NWF上原位构建了由间隙为20~110 nm Ag纳米片(AgNS)组装成的AgNS@NWF微纳结构.扫描电子显微镜(SEM)分析表明,AgNS@NWF具有特殊的层级结构,该结构可用于表面增强拉曼散射(SERS)研究.实验结果表明,AgNS@NWF微纳结构具有良好的SERS灵敏度和优异的信号可重现性.将罗丹明6G(R6G)作为SERS探针分子,发现R6G的SERS特征峰强度的对数值与R6G水溶液的浓度对数值呈良好的线性关系,最低检测限可达1×10^(‒10) mol/L,表明AgNS@NWF微纳结构具有良好的SERS灵敏度;当R6G水溶液的浓度为1×10^(‒5),1×10^(‒6)和1×10^(‒7) mol/L时,610 cm^(‒1)处谱带拉曼散射强度的相对标准偏差分别为3.57%,3.67%和8.46%,优于或接近于以往研究,表明AgNS@NWF微纳结构具有优异的信号可重现性.将3-巯基丙酸和三聚氰胺作为SERS的检测分子,最低检测限分别为1×10^(‒5)和1×10^(‒6) mol/L.本文为制备灵敏度高、信号可重现性优异的SERS基底提供了一种简单、快速、成本低廉的方法,在生物检测和环境监测中具有潜在的应用价值.A two-step chemical synthesis method was used to in situ construct Ag nanosheets(AgNS)with a nanogap of 20—110 nm on the non-woven fabrics fiber(NWF)(marked with AgNS@NWF).Scanning electron microscopy showed that the AgNS@NWF micro-nano structure had a hierarchical structure,and it was used for the study of surface-enhanced Raman scattering(SERS).The experimental results showed that the asprepared AgNS@NWF micro-nano structure had a good SERS sensitivity and excellent signal reproducibility.Rhodamine 6G(R6G)was used as the probe molecule for SERS detection,and the logarithmic plot of SERS intensity versus loading concentration of R6G played a small slope of 0.32±0.03,indicating that the AgNS@NWF micro-nano structure offers sufficient binding sites for the efficient capture of the analyte from the loading solution,even at a low concentration of 1×10^(−10) mol/L,the Raman peaks of R6G at band of 610,773,1361 and 1648 cm^(−1) could still be clearly observed.The relative standard deviations of the Raman scattering intensities at band of 610 cm−1 were 3.57%,3.67%and 8.46%,respectively,when the concentration of R6G was reduced by an order of magnitude in the range of 1×10^(‒5)―1×10^(‒7) mol/L,which was better than or close to previous studies.The AgNS@NWF micro-nano structure was used to detect low-activity 3-mercaptopropionic acid and melamine molecules,and the minimum detection limits were 1×10^(‒5) mol/L and 1×10^(−6) mol/L,respec⁃tively.This method offered an easy,rapid,and low-cost way to prepare highly sensitive and reproducible SERS substrates and made the SERS more practicable.

关 键 词：表面增强拉曼散射 无纺布 银纳米片 纳米间隙 罗丹明6G 

分 类 号：O657[理学—分析化学]