Issue 7, 2004

Functionalized CdSe quantum dots as selective silver ion chemodosimeter

Abstract

CdSe quantum dots (QDs) have been prepared and modified with mercaptoacetic acid. They are water-soluble and biocompatible. To improve their fluorescence intensity and stability in water solution, bovine serum albumin (BSA) was absorbed onto their surface. Based on the quench of fluorescence signals of the functionalized CdSe QDs in the 543 nm wavelength and enhancement of them in the 570–700 nm wavelength range by Ag(I) ions at pH 5.0, a simple, rapid and specific method for Ag(I) determination was proposed. In comparison with single organic fluorophores, these nanoparticles are brighter, more stable against photobleaching, and do not suffer from blinking. Under the optimum conditions, the response is linearly proportional to the concentration of Ag(I) between 4.0 × 10−7 and 1.5 × 10−5 mol L−1, and the limit of detection is 7.0 × 10−8 mol L−1. The mechanism of reaction is also discussed.

Article information

Article type
Paper
Submitted
06 Jan 2004
Accepted
23 Mar 2004
First published
20 Apr 2004

Analyst, 2004,129, 619-622

Functionalized CdSe quantum dots as selective silver ion chemodosimeter

J. Liang, X. Ai, Z. He and D. Pang, Analyst, 2004, 129, 619 DOI: 10.1039/B317044F

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