Issue 61, 2015

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Abstract

A surface-enhanced Raman scattering (SERS) sensor of mercury ions based on the coordinated catalytic reaction of Hg2+–Ag nanoparticles (NPs) has been designed and constructed for water quality monitoring. We combined Ag NPs (average particle size is 49 nm) with mercury ions to form Hg2+–Ag NPs in aqueous phase by electrostatic interactions. The formed Hg2+–Ag particles can catalyze a redox reaction between o-phenylendiamine (OPD) and dissolved oxygen to form 2,3-diaminephenazine (DAP), which is Raman-active and possesses a strong SERS signal due to the adherence to Ag NPs. Therefore we can trace the SERS intensity of DAP to determine mercury ions and the lowest detectable concentration of mercury is 1.0 nM using this method. This sensor displays higher sensitivity and selectivity and it possesses a certain value in terms of water quality detection.

Graphical abstract: Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
01 may 2015
Accepted
26 may 2015
First published
26 may 2015

RSC Adv., 2015,5, 49759-49764

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

G. Qi, C. Fu, G. Chen, S. Xu and W. Xu, RSC Adv., 2015, 5, 49759 DOI: 10.1039/C5RA08009F

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