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  • Title: Facile synthesis of N-acetyl-L-cysteine capped ZnS quantum dots as an eco-friendly fluorescence sensor for Hg2+.
    Author: Duan J, Jiang X, Ni S, Yang M, Zhan J.
    Journal: Talanta; 2011 Sep 30; 85(4):1738-43. PubMed ID: 21872012.
    Abstract:
    This paper described an investigation of a novel eco-friendly fluorescence sensor for Hg(2+) ions based on N-acetyl-l-cysteine (NAC)-capped ZnS quantum dots (QDs) in aqueous solution. By using safe and low-cost materials, ZnS QDs modified by NAC were easily synthesized in aqueous medium via a one-step method. The quantitative detection of Hg(2+) ions was developed based on fluorescence quenching of ZnS QDs with high sensitivity and selectivity. Under optimal conditions, its response was linearly proportional to the concentration of Hg(2+) ions in a range from 0 to 2.4 × 10(-6) mol L(-1) with a detection limit of 5.0 × 10(-9) mol L(-1). Most of common physiologically relevant cations and anions did not interfere with the detection of Hg(2+). The proposed method was applied to the trace determination of Hg(2+) ions in water samples. The possible quenching mechanism was also examined by fluorescence and UV-vis absorption spectra.
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