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.

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Volume25, Issue12

December, 2007

Pages 1836-1841

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

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

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