Abstract
It is significant to explore a rapid and highly sensitive galvanic replacement reaction (GRR) surface enhanced Raman scattering (SERS) method for detection of trace mercury ions. This article was reported a new GRR SERS analytical platform for detecting Hg(II) with label-free molecular probe Victoria blue B (VBB). In HAc-NaCl-silver nanorod (AgNR) substrate, the molecular probe VBB exhibited a strong SERS peak at 1609 cm−1. Upon addition of Hg(II), the GRR occurred between the AgNR and Hg(II), and formed a weak SERS activity of Hg2Cl2 that deposited on the AgNR surfaces to decrease the SERS intensity at 1609 cm−1. The decreased SERS intensity was linear to Hg(II) concentration in the range of 1.25–125 nmol/L, with a detection limit of 0.2 nmol/L. The GRR was studied by SERS, transmission electron microscopy and other techniques, and the GRR mechanism was discussed.
Highlights
It is significant to explore a rapid and highly sensitive galvanic replacement reaction (GRR) surface enhanced Raman scattering (SERS) method for detection of trace mercury ions
Upon addition of trace Hg(II), the GRR took place between silver atoms and Hg(II) to form a larger size core-shell composite nanoparticles Agcore/Hg2Cl2shell with low SERS activity that lead to SERS signals quenching
In 75 mmol/L HAc solution, the diphenyl methane dye of Victoria blue B (VBB), triphenylmethane dye such as rhodamine 6G (Rh6G), rhodamine S (RhS) and rhodamine B (RhB), safranine dye of safranine T (ST), acridine dye of acridine red (AR), per ylenetetracarboxylic diimide (PTD) and TPPS as molecular probes were examined that could be adsorbed on the surface of AgNR aggregates with strong SERS peaks (Table S1)
Summary
It is significant to explore a rapid and highly sensitive galvanic replacement reaction (GRR) surface enhanced Raman scattering (SERS) method for detection of trace mercury ions. This article was reported a new GRR SERS analytical platform for detecting Hg(II) with label-free molecular probe. It is significance to establish a highly sensitive and selective analytical method to detect mercury ions. Silver nanoparticles possess advantages of low-cost, high molar extinction coefficient and its aggregates are of low molar extinction coefficient and strong SERS effect It provides the foundation for their applications[20,21,22]. SERS is detected solely trace analyte which adsorbed on the nanosurface especially nanosilver, and present rich information about molecular structure[23].
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