Organic-free colloidal semiconductor nanocrystals as luminescent sensors for metal ions and nitroaromatic explosives

Exposed surfaces of organic-free colloidal semiconductor nanocrystals act as generic luminescent sensors for multiple analytes. S(2-) capped CdSe/CdSeS/CdS core/gradient-shell/shell nanocrystals are turn-on sensors for Cd(2+) ions (110 pM) in an aqueous medium with physiological pH 7.4. A similar or...

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Veröffentlicht in:	Chemical communications (Cambridge, England) England), 2014-05, Vol.50 (36), p.4743-4746
Hauptverfasser:	Swarnkar, Abhishek, Shanker, G Shiva, Nag, Angshuman
Format:	Artikel
Sprache:	eng
Schlagworte:	Cadmium - analysis Capping Colloids Colloids - chemistry Explosive Agents - analysis Explosives Luminescence Luminescent Agents - chemistry Nanocrystals Picrates - analysis Quantum Dots - chemistry Semiconductors Sensors Shells Trinitrotoluene - analysis
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Zusammenfassung:	Exposed surfaces of organic-free colloidal semiconductor nanocrystals act as generic luminescent sensors for multiple analytes. S(2-) capped CdSe/CdSeS/CdS core/gradient-shell/shell nanocrystals are turn-on sensors for Cd(2+) ions (110 pM) in an aqueous medium with physiological pH 7.4. A similar organic-free semiconductor nanocrystal shows luminescence turn-off sensing for 2,4,6-trinitrophenol, a known explosive.
ISSN:	1359-7345 1364-548X
DOI:	10.1039/c4cc00829d