Explosive sensing with fluorescent dendrimers: the role of collisional quenching

Olley, David A., Wren, Ellen J., Vamvounis, George, Fernee, Mark J., Wang, Xin, Burn, Paul L., Meredith, Paul, and Shaw, Paul E. (2011) Explosive sensing with fluorescent dendrimers: the role of collisional quenching. Chemistry of Materials, 23 (3). pp. 789-794.

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Abstract

We have investigated a series of branched fluorescent sensing compounds with thiophene units in the arms and triphenylamine centers for the detection of nitrated model compounds for 2,4,6-trinitrotoluene (TNT) and the plastic explosives taggant 2,3-dimethyl-2,3-dinitrobutane (DMNB). Stern−Volmer measurements in solution show that the fluorescence is more efficiently quenched by nitroaromatic compounds when compared to a non-nitrated quencher, benzophenone. Simple modification of the structure of the sensing compound was found to result in significant changes to the sensitivity and selectivity toward the nitrated analytes. A key result from time-resolved fluorescent measurements showed that the chromophore−analyte interaction was primarily a collisional process. This process is in contrast to conjugated polymers where static quenching dominates, a difference that could offer a potentially more powerful detection mechanism.

Item ID: 31992
Item Type: Article (Refereed Research - C1)
ISSN: 1520-5002
Funders: Australian Research Council (ARC), University of Queensland (UQ)
Projects and Grants: ARC FF0668728, ARC DP09A6838
Date Deposited: 16 Oct 2014 04:17
FoR Codes: 03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials @ 25%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 25%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials @ 50%
SEO Codes: 81 DEFENCE > 810104 Emerging Defence Technologies @ 100%
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