文献类型：期刊文献

英文题名：A SERS-based capillary sensor for the detection of mercury ions in environmental water

作者：Zhao, Yubin[1];Yamaguchi, Yoshinori[1,2];Ni, Yi[1];Li, Mingda[1];Dou, Xiaoming[1,2]

机构：[1]East China Univ Sci & Technol, Sch Sci, Inst Photon & Biomed, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Osaka Univ, Grad Sch Engn, Dept Appl Phys, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

年份：2020

卷号：233

外文期刊名：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

收录：;EI(收录号：20200908242741);WOS:【SCI-EXPANDED(收录号:WOS:000521457100008)】；

基金：This research was supported by the Research Start-up Fund Project of East China University of Science and Technology (No. YK0142119).

语种：英文

外文关键词：Surface-enhanced Raman scatting; Capillary; Mercury ion; Environmental water analysis; Surface-enhanced Raman scatting; Capillary; Mercury ion; Environmental water analysis

摘要：Mercury ion ( Hg2+) is one of the most toxic heavy metal ions which will cause permanent damage to the brain and kidneys. So, it is important to develop a sensitive, simple and reliable approach to detect Hg2+. In this work, we report a surface-enhanced Raman scatting (SERS) sensor by decorating the inner wall of capillary with 4,4'-dipyridyl (Dpy) functionalized silver nanoparticles (AgNPs). The main advantage of this sensor is that it can collect samples directly by capillary force and carry out on-site analysis by combining portable Raman spectrometer. In the presence of Hg2+, the Dpy molecules would be separated from the surface of AgNPs and coordinated with Hg2+ resulting in a decrease in the SERS signal. A linear correlation of Raman intensity with Hg2+ concentrations from 1 to 100 part-per-billion (ppb) was obtained for quantitative analysis and the limit of detection (LOD) was determined to be 0.1 ppb. The good reproducibility and selectivity of the sensor were also demonstrated. In addition, the sensors were successfully applied to detect Hg2+ in real environmental water samples, and the sampling process provided operation convenience compared to conventional methods. These results indicated that these capillary sensors had great potential for Hg2+ detection in practical use. (C) 2020 Published by Elsevier B.V.