文献类型：期刊文献

英文题名：Real-time preparation of surface enhanced Raman scattering substrate for on-line analysis of aromatic molecules in capillary

作者：Kang, Yan[1];Chen, Wanchao[1];Zhang, Han[1];Sun, Lin[1];Wu, Ting[1];Du, Yiping[1]

机构：[1]East China Univ Sci & Technol, Res Ctr Anal & Test, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：137

起止页码：15

外文期刊名：MICROCHEMICAL JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000423894800003)】；

基金：This work was supported by Science and Technology Commission of Shanghai Municipality (No. 17142202600) and Fundamental Research Funds for the Central Universities (No. 222201714047). The authors are grateful to Dr. L Li and W. Tao for helpful discussions.

语种：英文

外文关键词：Surface-enhanced Raman scattering; Real-time preparation; On-line analysis; Aromatic molecules

摘要：A new way of real-time preparation of surface enhanced Raman scattering (SERS) substrate was developed by laser photoreduction of AgNO3 mixed with probe molecules (aromatic amine, aromatic mercaptan or phenolic compound) in capillary. The preparation of Ag nanoparticle cluster and acquisition of SERS signal could be performed synchronously and finished within several seconds. Probe molecules were analyzed on line in capillary. It was proposed that the rapid photoreduction process was initiated by photoinduced electron transfer from electron donors aromatic molecule to Ag+ under laser illumination. The p electrons from N (S or O) and pi electrons from aromatic ring could form p-pi conjugated structure. These delocalized electrons assisted the rapid reduction of Ag+ in such a short time. Additionally, Raman maps with 8 mu m increment in X-Y directions (35 spectral spots) demonstrated good point-to-point repeatability of the substrate with the relative standard deviation less than 9%. Under optimal condition, several probe molecules, including benzidine, bisphenol A and so on were determined on line in capillary by this new method. (C) 2017 Elsevier B.V. All rights reserved.