Design of a Fluorometric Sensor Array for Visual Detection and Discrimination of Nitroaromatic Explosives
Paper ID : 1036-ICNS
Authors:
Forough Ghasemi1, M.Reza Hormozi-Nezhad *2
1Department of Nanotechnology, Agricultural Biotechnology Research Institute of Iran
2Department of Chemistry, Sharif University of Technology
Abstract:
Detection of nitroaromatic explosives has become increasingly important because of human health, public safety, environment, and military concerns. In this study, we have presented a ratiometric sensor array for the detection and discrimination of widely-used nitroaromatics (i.e., 2,4,6-trinitrotoluene (TNT), 2,4,6-trinitrophenol (TNP), and 2,4-dinitrotoluene (DNT)). In the design of the sensor elements (SE), we have employed blue emissive carbon dots (BCDs) in combination with yellow (SE-A) and red (SE-B) emissive cadmium telluride quantum dots (CdTe QDs). The fluorescence intensity of BCDs, YQDs, and RQDs are quenched by TNT, DNT, and TNP in various degrees. Both TNT and TNP cause the quenching and spectral shift of BCDs (TNT causes a blueshift and TNP causes a redshift). However, DNT has no effect on CDs emission. The developed double-emitter sensor array is capable of discriminating nitroaromatics in the concentration range of 5.0 to 200.0 μmol L-1 with a limit of quantification as low as 5.0 μmol L-1. In addition, the sensor array demonstrates a promising capacity to detect structurally similar nitroaromatics in mixtures and complex media of soil and groundwater samples.
Keywords:
“Nitroaromatic explosives”, “Ratiometric probe”, “Carbon dots”, “Quantum dots”
Status : Abstract Accepted (Poster Presentation)