Virgin silver nanoparticles as colorimetric nanoprobe for simultaneous detection of iodide and bromide ion in aqueous medium

摘要

A simple colorimetric nanoprobe based on virgin silver nanoparticles (AgNPs) was developed for the selective detection of iodide and bromide ions via aggregation and anti-aggregation mechanism. With addition of I- ions, virgin AgNPs, in presence of Fe3+, showed perceptible color change from yellow to colorless along with disappearance of surface plasmon resonance (SPR) band of AgNPs at 400 nm. But in presence of Cr3+, AgNPs turned yellow upon addition of I- and Br- anions. The developed virgin AgNPs probe showed high specificity and selectivity with the detection limits down to 0.32 mu M and 1.32 mu M for I- ions via two different mechanistic routes. Also, the designed probe detects Br- with a detection limit down to 1.67 mu M. (C) 2015 Elsevier B.V. All rights reserved.