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Proceedings Paper

Quantum dots for detection of trace amount of nonvolatile explosives: the effect of TNT in the fluorescence of CdSe quantum dots
Author(s): Sorelis Nieto; Alberto Santana; Samuel P. Hernandez-Rivera; Richard T. Lareau; R. Thomas Chamberlain; Miguel E. Castro-Rosario
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Paper 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.

Paper Details

Date Published: 15 September 2004
PDF: 5 pages
Proc. SPIE 5403, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III, (15 September 2004); doi: 10.1117/12.542797
Show Author Affiliations
Sorelis Nieto, Univ. de Puerto Rico/Mayaguez (United States)
Alberto Santana, Univ. de Puerto Rico/Mayaguez (United States)
Samuel P. Hernandez-Rivera, Univ. de Puerto Rico/Mayaguez (United States)
Richard T. Lareau, Transportation Security Administration (United States)
R. Thomas Chamberlain, Transportation Security Administration (United States)
Miguel E. Castro-Rosario, Univ. de Puerto Rico/Mayaguez (United States)


Published in SPIE Proceedings Vol. 5403:
Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III
Edward M. Carapezza, Editor(s)

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