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15 September 2004 Quantum dots for detection of trace amount of nonvolatile explosives: the effect of TNT in the fluorescence of CdSe quantum dots
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Abstract
We report on the effect of trinitrotoluene (TNT) in the fluroescence emission of CdSe quantum dots covered with a ZnS core shell. Pulses of 100 femtoseconds are employed to excite the fluorescence of the dots off resonance. We found evidence for a strong quenching by TNT on the fluorescence emission of the quantum dots. The fluorescence emission of the QD experiences a blue or red shift that depends on the CdSe particle size and amount of TNT. The results are explained in terms of a charge transfer mechanism or a modification of the traps involved in electron relaxation in QD. The results show that QD are a promising tool for TNT sensing.
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Sorelis Nieto, Alberto Santana, Samuel P. Hernandez-Rivera, Richard T. Lareau, R. Thomas Chamberlain, and Miguel E. Castro-Rosario "Quantum dots for detection of trace amount of nonvolatile explosives: the effect of TNT in the fluorescence of CdSe quantum dots", Proc. SPIE 5403, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III, (15 September 2004); https://doi.org/10.1117/12.542797
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