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Selective Detection of Mercury(II) and Copper(II) Based on the Opposite Size‐dependent Fluorescence Quenching of CdTe Quantum Dots
Author(s) -
XIA YunSheng,
CAO Chun,
ZHU ChangQing
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790339
Subject(s) - chemistry , copper , fluorescence , quantum dot , cadmium telluride photovoltaics , mercury (programming language) , quenching (fluorescence) , aqueous solution , selectivity , analytical chemistry (journal) , inorganic chemistry , photochemistry , nanotechnology , chromatography , organic chemistry , physics , materials science , quantum mechanics , computer science , programming language , catalysis
Three different size CdTe quantum dots (QDs) capped by 3‐mercaptopropionic acid (MPA) have been prepared in aqueous solutions, and their interactions with Cu 2+ and Hg 2+ have been investigated. The opposite size‐dependent fluorescence quenching of CdTe QDs by Hg 2+ and Cu 2+ was observed: Hg 2+ quenched smaller particles more efficiently than larger ones while larger particles were more markedly quenched by Cu 2+ . Based on the different size responses, Hg 2+ and Cu 2+ 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.