Rapid and selective detection of nitro explosives is one of the most promising issues concerning global security. Intensive research has already been carried out, however, the selectivity is still lacking. In the present work, water soluble MoS 2 quantum dots (QDs) are synthesized through a bottom-up approach using (NH 4 ) 6 Mo 7 O 24 Á4H 2 O and Na 2 S as molybdenum and sulfur sources, respectively, and 1,4-diaminobutane as the capping agent. The as-synthesized QDs detect 2,4,6-trinitrophenol (TNP) selectively up to 2.04 ppm and the selectivity reaches 490% which is remarkably higher than the earlier results. In addition to predominant electron transfer (ET) that occurs mostly in fluorescence quenching processes, Forster resonance energy transfer (FRET) also occurs here. As a result of the occurrence of both these ET and FRET processes, high selectivity is achieved for the present samples. The unique advantage of using QDs is the tuning of photoluminescence as a function of dot size to become comparable with the absorption spectra of the TNP to perform the FRET mechanism.

Cysteamine capped CdTe QD functionalized CP1 as a white light emitter in LED applications.

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During the last few years, intensive research has been carried out on the synthesis of different hybrid nanostructures mostly using hydrothermal and solvothermal techniques.