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题名: Satellite Fe3O4@SiO2-Au SERS probe for trace Hg2+ detection
作者: Sun, Zhenli; Du, Jingjing; Lv, Bo; Jing, Chuanyong
刊名: RSC ADVANCES
出版日期: 2016
卷号: 6, 期号:77, 页码:73040-73044
DOI: 10.1039/c6ra15044f
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: Plasmonic core-satellite Fe3O4@SiO2-Au (FA) was synthesized for Hg2+ detection based on the "turn-off" SERS strategy. The functionalization of FA simply included the adsorption of congo red (CR) to FA through a PDDA linker. In the presence of Hg2+, CR molecules are released from the substrate, thus generating a decreased peak intensity in the observed Raman spectra. This "turn-off" effect serves as the basis for the determination of trace Hg(II) with a detection limit of 1 x 10(-8) M. The strong interaction between Hg2+ and the SERS substrate was confirmed by zeta potential and SEM-EDS analysis. The XANES results show that 94% of Hg on the substrate was reduced to Hg-0, indicative of an Hg-Au amalgam formation. The interference from other metal ions and humic acids commonly encountered in the environment was negligible. This FA-CR SERS platform is a promising tool for monitoring mercury ions in environmental applications.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35938
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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