文献类型：期刊文献

英文题名：Highly sensitive surface-enhanced Raman scattering detection of hexavalent chromium based on hollow sea urchin-like TiO2@Ag nanoparticle substrate

作者：Zhou, Wen[1];Yin, Bin-Cheng[1];Ye, Bang-Ce[1,2]

机构：[1]East China Univ Sci & Technol, Lab Biosyst & Microanal, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Shihezi Univ, Sch Chem & Chem Engn, Xinjiang 832000, Peoples R China

年份：2017

卷号：87

起止页码：187

外文期刊名：BIOSENSORS & BIOELECTRONICS

收录：;EI(收录号：20163402731314);WOS:【SCI-EXPANDED(收录号:WOS:000390499600028)】；

基金：This work was jointly supported by the National Natural Science Foundation of China (Grants 21335003, 21575089) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Hexavalent chromium detection; Surface-enhanced Raman scattering (SERS); Hollow sea urchin-like TiO2@Ag NPs; Recyclable detection

摘要：As one of the most toxic heavy metals, hexavalent chromium (Cr(VI)) has long been a concern due to its threats to human health and the environment. In this work, we develop a sensitive surface-enhanced Raman scattering (SERS) sensor for highly specific detection of Cr(VI) using hollow sea urchin-like TiO2@Ag nanoparticles (NPs). The TiO2@Ag NPs are functionalized with glutathione (GSH) and used as substrates with 2-mercaptopyridine (2-MPy) as a Raman reporter for a recyclable SERS-active sensor, enabling ultrasensitive detection of Cr(VI). Excellent SERS signals of 2-MPy reporters are detected when GSH complexation with Cr(VI) causes aggregation of the TiO2@Ag NPs. The developed sensor exhibits good linearity in the range from 10 nM to 2 mu M for Cr(VI) with a detection limit of ca. 1.45 nM. It features excellent selectivity to Cr(VI) over other interfering metal ions, and good application for quantitative analysis of Cr(VI) in water samples. Moreover, the proposed SERS sensor can be fully regenerated when exposed to UV light as a result of the self-cleaning ability of the substrates. In contrast to the traditional SERS detection, the present work shed new light on the design and synthesis of hierarchically self assembled 3D substrate for SERS, catalysis and biosensor development. (C) 2016 Elsevier B.V. All rights reserved.