文献类型：期刊文献

英文题名：Selective determination of mercury(II) by self-referenced surface-enhanced Raman scattering using dialkyne-modified silver nanoparticles

作者：Kang, Yan[1,2];Wu, Ting[1,2];Liu, Binxiang[1,2];Wang, Xuan[1,2];Du, Yiping[1,2]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2014

卷号：181

期号：11-12

起止页码：1333

外文期刊名：MICROCHIMICA ACTA

收录：;EI(收录号：20242616485777);WOS:【SCI-EXPANDED(收录号:WOS:000340360900020)】；

基金：We are thankful to the National Natural Science Foundation of China (21,205,041) for financial support. The authors are grateful to Dr. J.X. Li, L. F. Zhang, L. Zhang, D. F. Li and W. Tao for helpful discussions.

语种：英文

外文关键词：Mercury ion; Surface-enhanced Raman scattering; Sensor; Diethynylbenzene

摘要：A novel surface-enhanced Raman scattering (SERS) probe was developed for selective determination of Hg(II) ion. It is based on the use of silver nanoparticles (Ag-NPs) modified with the dialkyne 1,4-diethynylbenzene (DEB). Hg(II) undergoes a very selective chemical reaction with the terminal ethynyl groups to form a -C a parts per thousand C-Hg-C a parts per thousand C- linkage which triggers the aggregation of Ag-NPs. This generates numerous hot spots that cause a substantial increase in the intensity of the SERS signal at 2,146 cm(-1). This large effect was exploited for sensitive quantification of Hg(II) in aqueous solution by rationing the intensities of the (Hg-C a parts per thousand C) peak at 2,146 cm(-1) and the (C a parts per thousand C) (free) peak at 2,109 cm(-1). This self-referenced method is superior to the use of an internal standard. The method also displays excellent selectivity over other metal ions. Under optimal conditions, the rationed signal intensity is related to concentration of Hg(II) in the range between 1.1 nM and 61.2 nM, with a detection limit at 0.8 nM. The method was successfully applied to the determination of Hg(II) in spiked samples of river water.