(618bs) Novel Fluorescent Nanofibrous Membrane As Sensory Materials – towards Landmine Detection

Wang, Y., University of Connecticut
Ding, Y., University of Connecticut
La, A., University of Connecticut
Lei, Y., University of Connecticut

The worldwide landmine problem is one of driving forces for the development of explosive detection. The fluorescence sensor described here is developed via simple and cost-effective routes for landmine signature vapors detection in vapor phase at ultratrace concentration levels. Electrospinning is adapted to generate highly porous nanofibrous morphology, providing large surface-to-volume ratio and free channels to expedient analytes adsorption and diffusion. The binding between the sensing film with electron-deficient explosive molecules results in a dramatic decrease in fluorescence emission (e.g. 90% quenching by 2,4-dinitrotoluene (DNT) vapor within 6 min). In addition, this sensor shows a remarkable selectivity towards nitrated explosives vapor, such as DNT, 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), 2,4,6-trinitrophenylmethylnitramine (Tetryl), pentaerythritol tetranitrate (PETN) and nitroglycerin (NG). A portable sensor prototype with a handheld UV lamp has been demonstrated for the detection of DNT buried in soil, indicating its potential application for visualizing landmines by naked eyes.