期刊
MICROCHIMICA ACTA
卷 188, 期 10, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-021-05016-4
关键词
Au@Ag core-shell nanoparticles; Capillary-based SERS; Surface enhanced Raman spectroscopy; Hg2+ determination; Amalgamation
资金
- Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [2019QZKK0201]
- Opening Research Foundation of Key Laboratory of Coarse Cereal Processing of Ministry of Agriculture and Rural Affair [2020CC004]
- Introduction of Talent Research Start-Up Fund of Chengdu University [2081920038]
- Opening Project of Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization [HZXYKFKT201901]
The capillary-based SERS sensor is fabricated for ultrasensitive and selective detection of Hg2+ in water, with a limit of detection as low as 0.03 nM. It offers the advantages of simple preparation, superior stability, and high selectivity, promising for rapid and on-site detection of Hg2+ in water combined with a portable Raman device.
A capillary-based SERS sensor was fabricated for ultrasensitive and selective detection of Hg2+ in water. Au@Ag core-shell NPs embedded with 4-mercaptobenzoic acid (4-MBA) (Au@4-MBA@Ag) were prepared by a seed growth method and fixed on the inner wall of the glass capillary to obtain the sensor. Owing to the amalgamation between Ag and Hg, the capillary-based SERS sensor can specifically recognize the reduced Hg2+ without any recognition element, and the resulted Ag/Hg amalgam can weaken the SERS activity of Ag shell; thus, the SERS intensity of the embedded 4-MBA at 1075 cm(-1) gradually decreased with the increase of Hg2+ concentration. Under the optimum condition, the fabricated sensor can sensitively determine Hg2+ in water with a limit of detection (LOD) as low as 0.03 nM. The capillary-based SERS sensor offers the advantages of simple preparation, superior stability, and high selectivity, which is promising for rapid and on-site detection of Hg2+ in water combined with a portable Raman device.
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