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Multichannel detection and differentiation of explosives with a quantum dot array

Peveler, William J., Roldan Martinez, Alberto, Hollingsworth, Nathan, Porter, Michael J. and Parkin, Ivan P. 2016. Multichannel detection and differentiation of explosives with a quantum dot array. ACS Nano 10 (1) , pp. 1139-1146. 10.1021/acsnano.5b06433

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Abstract

The sensing and differentiation of explosive molecules is key for both security and environmental monitoring. Single fluorophores are a widely used tool for explosives detection, but a fluorescent array is a more powerful tool for detecting and differentiating such molecules. By combining array elements into a single multichannel platform, faster results can be obtained from smaller amounts of sample. Here, five explosives are detected and differentiated using quantum dots as luminescent probes in a multichannel platform: 2,4-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT), tetryl (2,4,6-trinitrophenylmethylnitramine), cyclotrimethylenetrinitramine (RDX), and pentaerythritol tetranitrate (PETN). The sharp, variable emissions of the quantum dots, from a single excitation wavelength, make them ideal for such a system. Each color quantum dot is functionalized with a different surface receptor via a facile ligation process. These receptors undergo nonspecific interactions with the explosives, inducing variable fluorescence quenching of the quantum dots. Pattern analysis of the fluorescence quenching data allows for explosive detection and identification with limits-of-detection in the ppb range.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Additional Information: Published online 18 November 2015
Publisher: American Chemical Society
ISSN: 1936-0851
Date of Acceptance: 18 November 2015
Last Modified: 07 Feb 2020 13:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/87721

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