标题：Facile synthesis of N-acetyl-l-cysteine capped ZnS quantum dots as an eco-friendly fluorescence sensor for Hg~(2+)
作者：Duan, J.;Jiang, X.;Ni, S.;Yang, M.;Zhan, J.
作者机构：[Duan, J] Department of Chemistry, Ministry of Education, Shandong University, Jinan 250100, China;[ Jiang, X] Department of Chemistry, Ministry of Ed 更多
通讯作者地址：[Zhan, JH]Shandong Univ, Key Lab Colloid & Interface Chem, Minist Educ, Dept Chem, Jinan 250100, Peoples R China.
来源：Talanta: The International Journal of Pure and Applied Analytical Chemistry
关键词：Fluorescence;Mercury ions;Nanoparticles;Quantum dots;Sensors;Zinc sulfide
摘要：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.