4.8 Article

Highly Sensitive Gold Nanoparticle-Based Colorimetric Sensing of Mercury(II) through Simple Ligand Exchange Reaction in Aqueous Media

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 1, Pages 292-295

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/am9006963

Keywords

colorimetric; dithioerythritol; gold nanoparticles; ligand exchange; mercury

Funding

  1. Korea Research Foundation [KRF-2008-313-C00563]
  2. Korea Science and Engineering Foundation (KOSEF), Korea government (MEST) [R11-2005-008-06002-0]
  3. Brain Korea 21 fellowship
  4. Korean Federation of Science and Technology Societies (KOFST) [082S-1-3-0195]

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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.

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