Direct visualization of lead corona and its nanomolar colorimetric detection using anisotropic gold nanoparticles

Charu Dwivedi; Abhishek Chaudhary; Abhishek Gupta; Chayan K Nandi

doi:10.1021/am507495j

Direct visualization of lead corona and its nanomolar colorimetric detection using anisotropic gold nanoparticles

ACS Appl Mater Interfaces. 2015 Mar 11;7(9):5039-44. doi: 10.1021/am507495j. Epub 2015 Mar 2.

Authors

Charu Dwivedi¹, Abhishek Chaudhary, Abhishek Gupta, Chayan K Nandi

Affiliation

¹ School of Basic Sciences, Indian Institute of Technology Mandi , Mandi-175001, India.

PMID: 25719820
DOI: 10.1021/am507495j

Abstract

The study presents dithiothreitol (DTT) functionalized anisotropic gold nanoparticles (GNP) based colorimetric sensor for detection of toxic lead ions in water. Our results demonstrate the selectivity and sensitivity of the developed sensor over various heavy metal ions with detection limit of ∼9 nM. The mechanism of sensing is explained on the basis of unique corona formation around the DTT functionalized anisotropic GNP.

Keywords: anisotropy; colorimetric assay; corona formation; gold nanoparticles; lead ions.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Colorimetry*
Dithiothreitol / chemistry
Gold / chemistry*
Ions / chemistry
Lead / analysis*
Metal Nanoparticles / chemistry*
Metal Nanoparticles / ultrastructure
Metals, Heavy / analysis
Water / chemistry

Substances

Ions
Metals, Heavy
Water
Lead
Gold
Dithiothreitol