Highly sensitive gold nanoparticle-based colorimetric sensing of mercury(II) through simple ligand exchange reaction in aqueous media.
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.
Kim
Yang-Rae
YR
Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
Mahajan
Rakesh Kumar
RK
Kim
Jong Seung
JS
Kim
Hasuck
H
D002151:Calorimetry / Q000379:methods; D004226:Dithioerythritol / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012680:Sensitivity and Specificity
D004226:Dithioerythritol; D006046:Gold; D008628:Mercury