Abstract
(Graphical abstract). 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 μM and 1.32 μM for I- ions via two different mechanistic routes. Also, the designed probe detects Br- with a detection limit down to 1.67 μM.
Original language | English |
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Pages (from-to) | 122-126 |
Number of pages | 5 |
Journal | Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy |
Volume | 149 |
DOIs | |
State | Published - 5 Oct 2015 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2015 Elsevier B.V. All rights reserved.
Funding
This work was made possible by a grant from the DST , New Delhi ( SR/S1/IC-54/2012 ). We would also like to thank SAIF, Indian Institute of Technology (IIT), Bombay for providing TEM facility.
Funders | Funder number |
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Department of Science and Technology, Ministry of Science and Technology, India | SR/S1/IC-54/2012 |
Keywords
- AgNPs
- Bromide
- Colorimetric sensor
- Iodide