期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 346, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130468
关键词
SERS; Chip; Trace Hg2+; Rapid detection; Seawater
资金
- National Natural Science Foundation of China [21475088]
- International Joint Laboratory on Resource Chemistry (IJLRC)
- Shanghai Engineering Research Center of Green Energy Chemical Engineering [18DZ2254200]
- Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- International Joint Laboratory on Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials
The study developed a chip for detecting Hg2+ in seawater, which utilizes GSH and gold film on ITO substrate to achieve superior SERS effect, showing quick response to trace Hg2+ ions.
Mercury ions (Hg2+) in seawater even at trace level could continuously cause serious threats to marine fishes as well as to human health by food chain. In this work, a chip for sensing Hg2+ in seawater is constructed by dense decoration of glutathione (GSH) onto ITO-Au film, designated as ITO-Au-GSH. The chip avoids the serious aggregation of nanoparticles in seawater, exhibiting the superior surface enhanced Raman scattering (SERS) effect. The sensing strategy is due to GSH enriching Hg2+ ions by -COOH and then 4-mercaptopyridine as signal reporter selectively docking onto the GSH bound Hg2+ via formation of specific Hg-S bond, which is validated by SERS and DFT calculation. Under the optimized condition, ITO-Au-GSH-chip-based SERS protocol has a quick response to trace Hg2+ ions in water. The quantitative linear range is from 2 ng/L to 200 mu g/L (R2 = 0.9871) and the limit of detection (LOD) of 1.76 ng/L is reached, which meets the limitation amount (2 mu g/L) of Hg2+ ions in water set by USEPA and WHO. In this work, a portable Raman spectrometer and such Raman-chip are used to onsite monitor Hg2+ in seawater and a good linear relationship is in the range of 20 ng/L to 200 mu g/L with the LOD of 4.77 ng/L. Clearly, the SERS-chip-based portable Raman strategy paves a path to realize seaside monitoring of marine environmental and early warning for mercury pollution.
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