Issue 4, 2013
From the journal:

Analytical Methods

Improved sensing performance from methionine capped CdTe and CdTe/ZnS quantum dots for the detection of trace amounts of explosive chemicals in liquid media†

T. Pazhanivel,ab   D. Nataraj,*ab   V. P. Devarajan,a   V. Mageshwari,a   K. Senthilc  and  D. Soundararajan*d  

* Corresponding authors

a Thinfilms & Nanomaterials Research Laboratory, Department of Physics, Bharathiar University, Coimbatore, India
E-mail: de.natraj2011@gmail.com
Fax: +91-422-2422387
Tel: +91-422-2428444

b DRDO-BU Centre for Life Sciences, Bharathiar University Campus, Coimbatore, India

c School of Advanced Materials Science & Engineering, Sungkyunkwan University (Suwon Campus), Cheoncheon-dong 300, Jangan-gu, Suwon 440-746, South Korea

d Department of Physics, Yeungnam University, Gyeongsan 712-749, Korea

Abstract

Water soluble methionine functionalized CdTe quantum dots (QDs) and CdTe/ZnS core–shell QD samples have been prepared by a reflux condensation method and have been used to detect explosive chemicals, such as dinitrotoluene (DNT), nitrotoluene (NT) and nitrobenzene (NB) in liquid media. Meisenheimer complex formation between the QD surface attached methionine and aromatic explosive molecules has helped to detect them selectively via a fluorescent quenching process. Fluorescence quenching occurred because of the transfer of excited electrons from QD to the explosive molecules. Depending upon the number of nitro groups present on the explosive molecule, the quenching efficiency of different analytes varied. Due to surface passivation and inductive effects, the methionine capped CdTe/ZnS core–shell quantum dot sample resulted in the maximum quenching constant.

Graphical abstract: Improved sensing performance from methionine capped CdTe and CdTe/ZnS quantum dots for the detection of trace amounts of explosive chemicals in liquid media

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Article information

DOI
https://doi.org/10.1039/C2AY26199E
Article type
Paper
Submitted
15 Oct 2012
Accepted
19 Nov 2012
First published
20 Nov 2012

Anal. Methods, 2013,5, 910-916

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Improved sensing performance from methionine capped CdTe and CdTe/ZnS quantum dots for the detection of trace amounts of explosive chemicals in liquid media

T. Pazhanivel, D. Nataraj, V. P. Devarajan, V. Mageshwari, K. Senthil and D. Soundararajan, Anal. Methods, 2013, 5, 910 DOI: 10.1039/C2AY26199E

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