高等学校化学学报

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银纳米片在无纺布纤维上的可控组装及其SERS效应

李奇1, 田杜1, 陈韶云1, 钟敏1, 胡成龙1(), 陈建2   

  1. 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
  • 收稿日期:2020-07-14 发布日期:2020-09-05
  • 通讯作者: 胡成龙 E-mail:ceshcl@jhun.edu.cn
  • 基金资助:
    武汉市科技局项目(2019010701011384);国家自然科学基金(51973244)

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

LI Qi1, TIAN Du1, CHEN Shaoyun1, ZHONG Min1, HU Chenglong1(), CHEN Jian2   

  1. 1.Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,School of Chemical and Environmental Engineering,Jianghan University,Wuhan 430056,China
    2.Instrumental Analysis and Research Center,Sun Yat?sen University,Guangzhou,510275,China
  • Received:2020-07-14 Published:2020-09-05
  • Contact: HU Chenglong E-mail:ceshcl@jhun.edu.cn
  • Supported by:
    ? Supported by the Wuhan Municipal Science and Technology Bureau, China(2019010701011384);the National Natural Science Foundation of China(51973244)

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.

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

Abstract:

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.

Key words: Surface-enhanced Raman scattering, Non-woven fabric, Silver nanosheet, Nanogap, Rhodamine 6G

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