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Proceedings Paper

Use of quantum dot-labeled imprinted polymer microparticles for detection of nitroaromatic compounds
Author(s): R. Cody Stringer; Shubhra Gangopadhyay; Sheila A. Grant
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Paper Abstract

The ability to detect high explosive compounds is a fundamental step in achieving the goal of creating devices capable of 'sniffing' out explosive devices. To detect high explosive compounds such as 2,4,6-trinitrotoluene (TNT), a molecularly imprinted polymer (MIP) sensor was developed. This sensor consists of MIP microspheres prepared using methacrylic acid as the functional monomer in a precipitation polymerization reaction. The MIP microspheres are then combined with fluorescent semiconductor nanocrystals, or quantum dots, via a simple crosslinking procedure. To study the sensor's ability to detect nitroaromatic analytes, the fluorescent-labeled MIP particles were exposed to aqueous 2,4- dinitrotoluene (DNT), a nitroaromatic molecule very similar to TNT. Characterization of the MIP particles shows a uniform size distribution, with an average diameter of approximately 615 nm. Imaging of the particles also shows that spherical shapes are being produced by the precipitation polymerization reaction. Preliminary data indicate that the sensor is capable of detecting nitroaromatic compounds in an aqueous solution. These results illustrate the future application of the fluorescent-labeled MIP sensor for detecting high explosives, with the potential for use in detecting vapors from explosive devices and in an array of environmental conditions.

Paper Details

Date Published: 23 April 2010
PDF: 6 pages
Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 767304 (23 April 2010); doi: 10.1117/12.852913
Show Author Affiliations
R. Cody Stringer, Univ. of Missouri-Columbia (United States)
Shubhra Gangopadhyay, Univ. of Missouri-Columbia (United States)
Sheila A. Grant, Univ. of Missouri-Columbia (United States)

Published in SPIE Proceedings Vol. 7673:
Advanced Environmental, Chemical, and Biological Sensing Technologies VII
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)

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