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Title: Attogram sensing of trinitrotoluene with a self-assembled molecular gelator
Authors: Kartha, K K
Santhosh Babu, S
Srinivasan, S
Ajayaghosh, A
Keywords: Arene perfluoroarene interactions
Exciation energy transfer
Fiber optic biosensor
Chemical sensors
Conjugated polymers
AU Nanoparticles
Enhanced emission
High explosives
Issue Date: 14-Mar-2012
Publisher: American Chemical Society
Citation: Journal of the American Chemical Society 134(10):4834-4841;14 Mar 2012
Abstract: Detection of explosives is of utmost importance due to the threat to human security as a result of illegal transport and terrorist activities. Trinitrotoluene (TNT) is a widely used explosive in landmines and military operations that contaminates the environment and groundwater, posing a threat to human health. Achieving the detection of explosives at a sub-femtogram level using a molecular sensor is a challenge. Herein we demonstrate that a fluorescent organogelator exhibits superior detection capability for TNT in the gel form when compared to that in the solution state. The gel when coated on disposable paper strips detects TNT at a record attogram (ag, 10−18 g) level (∼12 ag/cm2) with a detection limit of 0.23 ppq. This is a simple and low-cost method for the detection of TNT on surfaces or in aqueous solutions in a contact mode, taking advantage of the unique molecular packing of an organogelator and the associated photophysical properties
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