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Gold nanoparticle coated U-bend fibre optic probe for localized surface plasmon resonance based detection of explosive vapours

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Title Gold nanoparticle coated U-bend fibre optic probe for localized surface plasmon resonance based detection of explosive vapours
 
Creator BHARADWAJ, R
MUKHERJI, S
 
Subject Explosive detection
Vapour detection
Gold nanoparticles
Localized surface plasmon resonance
U-bend fibre optic sensor
TRINITROTOLUENE
BIOSENSOR
GLASS
 
Description In this study, we report a chemical sensor utilizing localized surface plasmon resonance (LSPR) of gold nanoparticles (GNP) for vapour phase detection of explosives like 2,4,6-trinitrotoluene (TNT) and cyclotrimethylenetrinitramine (RDX). The GNP were immobilized on a U-bend fibre optic sensor probe of 200 pin core diameter and bend diameter of 1.5 mm for evanescent field based excitation of localized surface plasmons of the GNP. The immobilized GNP were functionalized with receptor molecules viz. 4-mercaptobenzoic acid (4-MBA), L-cysteine and cysteamine to provide the binding sites for the nitro-based explosive molecules. Binding of the explosive analytes to the surface moieties of the GNP was found to elicit refractive index changes in the environment surrounding the nanoparticles. This led to changes in the absorbance characteristics of the GNP-LSPR spectrum. Furthermore, the GNP coated probes modified with L-cysteine and cysteamine exhibited a high degree of selectivity towards TNT. The detection limit of the LSPR fibre optic probe for TNT vapours was found to be in the lower parts per billion (ppb) with further scope for improvement. (C) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-29T05:15:10Z
2014-12-29T05:15:10Z
2014
 
Type Article
 
Identifier SENSORS AND ACTUATORS B-CHEMICAL, 192804-811
0925-4005
http://dx.doi.org/10.1016/j.snb.2013.11.026
http://dspace.library.iitb.ac.in/jspui/handle/100/17168
 
Language English