探索 Mo1-xWxS2@Ag2S 纳米片在选择性 SERS 检测中的电荷转移增强机制。

Qing Chen, Kun Pang, Qiao Tang, Jie Huang, Qianmin Dong, Pei Liang
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引用次数: 0

摘要

为了解决传统 SERS 基底灵敏度和选择性差的问题,本文采用两步水热法合成了 Mo1-xWxS2@Ag2S 纳米片。分别用 XRD 和 SEM 对合成的 Mo1-xWxS2@Ag2S 纳米片的结构和形貌进行了表征。结果表明,Mo1-xWxS2@Ag2S 纳米片具有不规则的层状结构。此外,还分别以罗丹明 6G(R6G)、结晶紫(CV)和 4-巯基苯甲酸(4-MBA)为探针分子,测试了 Mo1-xWxS2@Ag2S 纳米片的 SERS 特性。测试结果表明,纳米片对 R6G 和 CV 探针分子具有特异性,其选择性机制是 CT 增强。此外,Mo1-xWxS2@Ag2S 在 R6G 和 CV 中表现出超高的灵敏度,两者的相应检测限均达到 10-8 M。最后,在特征峰 613 cm-1 处测试 1 × 10-4 M R6G,得到该 Mo1-xWxS2@Ag2S 纳米片的相对标准偏差(RSDs)为 8.56%,表明其具有良好的检测重复性。Mo1-xWxS2@Ag2S纳米片富含有利于电荷转移的边缘活性位点,能更好地增强目标分子的SERS信号。此外,用硝基呋喃妥因(NFT)对 Mo1-xWxS2@Ag2S 纳米片表面进行拉曼检测,其检测限也达到了 10-8 M。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the charge transfer enhancement mechanism in selective SERS detection with Mo1-xWxS2@Ag2S nanosheets.

In order to solve the problem of poor sensitivity and selectivity of conventional SERS substrates, we synthesized Mo1-xWxS2@Ag2S nanosheets in this paper by a two-step hydrothermal method. The structure and morphology of the synthesized Mo1-xWxS2@Ag2S nanosheets were characterized by XRD and SEM,respectively. The results show that the Mo1-xWxS2@Ag2S nanosheet has an irregular layered structure. Further, the SERS properties of Mo1-xWxS2@Ag2S nanosheets were tested by using rhodamine 6G (R6G), crystalline violet (CV), and 4-mercaptobenzoic acid (4-MBA) as probe molecules, respectively. The test results demonstrated that the nanosheets were specific to R6G and CV probe molecules, and the mechanism of selectivity was due to CT enhancement. In addition, Mo1-xWxS2@Ag2S exhibits ultrahigh sensitivity in R6G and CV, with the corresponding detection limit of both reached 10-8 M. And linear fitting of the peak intensities was carried out, with the R2 coefficient of 0.981 and 0.951, respectively. Finally, the relative standard deviations (RSDs) of this Mo1-xWxS2@Ag2S nanosheets was obtained to be 8.56 % by test 1 × 10-4 M R6G at the characteristic peak 613 cm-1, which represents excellent detection repeatability. The Mo1-xWxS2@Ag2S nanosheets are rich in edge-active sites favorable for charge transfer, which can enhance the SERS signals of the target molecules better. Besides, the Raman detection of the surface of Mo1-xWxS2@Ag2S nanosheets using nitrofurantoin (NFT) also reached a detection limit of 10-8 M. Mo1-xWxS2@Ag2S nanosheets substrates can find applications in medicine and provide new strategies for improving the SERS performance.

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