Selective Detection of Mercury(II) and Copper(II) Based on the Opposite Size-dependent Fluorescence Quenching of CdTe Quantum Dots

Autor:	Yun-Sheng Xia, Chun Cao, Changqing Zhu
Rok vydání:	2007
Předmět:	Aqueous solution Chemistry Quantum dot Size dependent Analytical chemistry chemistry.chemical_element General Chemistry Selectivity Photochemistry Copper Cadmium telluride photovoltaics Mercury (element)
Zdroj:	Chinese Journal of Chemistry. 25:1836-1841
ISSN:	1614-7065 1001-604X
DOI:	10.1002/cjoc.200790339
Popis:	Three different size CdTe quantum dots (QDs) capped by 3-mercaptopropionic acid (MPA) have been prepared in aqueous solutions, and their interactions with Cu2+ and Hg2+ have been investigated. The opposite size-dependent fluorescence quenching of CdTe QDs by Hg2+ and Cu2+ was observed: Hg2+ quenched smaller particles more efficiently than larger ones while larger particles were more markedly quenched by Cu2+. Based on the different size responses, Hg2+ and Cu2+ were respectively detected with high sensitivity and selectivity, for the first time, using the QDs with different sizes but the same components and capping ligands.
Databáze:	OpenAIRE
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