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A capillary-based SERS sensor for ultrasensitive and selective detection of Hg.sup.2+ by amalgamation with Au@4-MBA@Ag core-shell nanoparticles

Liao, Wenlong ; Chen, Yangjie ; Huang, Lijuan ; Wang, Yong ; Zhou, Youting ; Tang, Quan ; Chen, Zhenming

Mikrochimica acta (1966), 2021-10, Vol.188 (10) [Periódico revisado por pares]

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Título:
A capillary-based SERS sensor for ultrasensitive and selective detection of Hg.sup.2+ by amalgamation with Au@4-MBA@Ag core-shell nanoparticles
Autor: Liao, Wenlong ; Chen, Yangjie ; Huang, Lijuan ; Wang, Yong ; Zhou, Youting ; Tang, Quan ; Chen, Zhenming
Assuntos: Sensors
É parte de: Mikrochimica acta (1966), 2021-10, Vol.188 (10)
Descrição: A capillary-based SERS sensor was fabricated for ultrasensitive and selective detection of Hg.sup.2+ 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 Hg.sup.2+ 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.sup.-1 gradually decreased with the increase of Hg.sup.2+ concentration. Under the optimum condition, the fabricated sensor can sensitively determine Hg.sup.2+ 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 Hg.sup.2+ in water combined with a portable Raman device. Graphical abstract
Editor: Springer
Idioma: Inglês

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