银纳米片在无纺布纤维上的可控组装及其SERS效应

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.

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

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 as- prepared 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， respectively. This method offered an easy， rapid， and low-cost way to prepare highly sensitive and reproducible SERS substrates and made the SERS more practicable.