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  • Highly sensitive gold nanoparticle-based colorimetric sensing of mercury(II) through simple ligand exchange reaction in aqueous media.

Highly sensitive gold nanoparticle-based colorimetric sensing of mercury(II) through simple ligand exchange reaction in aqueous media.

ACS applied materials & interfaces (2010-04-02)
Yang-Rae Kim, Rakesh Kumar Mahajan, Jong Seung Kim, Hasuck Kim
ABSTRACT

A strategy for the rational design of a novel colorimetric sensor based on dithioerythritol-modified gold nanoparticles for the selective recognition of Hg2+ in aqueous media is presented. This approach relies on the combination of gold nanoparticles with Hg2+ through sulfur-Hg2+-sulfur interaction. The gold nanoparticles showed high selectivity toward Hg2+ with binding-induced red shift in the absorption spectra, with no response to major interfering cations such as Pb2+, Cd2+, and Cu2+ in the presence of ethylenediamine tetraacetic acid. The system responds to Hg2+ with a detection limit of 100 nM and might open a new avenue for the development of Hg2+ sensing probes.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1,4-Dithioerythritol, ≥99.0% (RT), BioUltra
Sigma-Aldrich
1,4-Dithioerythritol, ≥99.0%
Sigma-Aldrich
1,4-Dithioerythritol, BioXtra, ≥99.0%
Sigma-Aldrich
1,4-Dithioerythritol, BioReagent, for molecular biology, ≥99.0%