L-cysteine capped CdSe as sensitive sensor for detection of trace lead ion in aqueous solution

被引：10

作者：

Ren, J. ^{[1
]}

Chen, H. L. ^{[1
]}

Ren, C. L. ^{[1
]}

Sun, J. F. ^{[1
]}

Liu, Q. ^{[1
]}

Wang, M. ^{[1
]}

Chen, X. G. ^{[1
]}

机构：

[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China

来源：

MATERIALS RESEARCH INNOVATIONS | 2010年 / 14卷 / 02期

基金：

中国国家自然科学基金;

关键词：

CdSe quantum dots; L-cysteine; Fluorescent probes; Lead ion; SELECTIVE FLUORESCENT CHEMOSENSOR; QUANTUM DOTS; PROBE; CADMIUM; WATER; PB2+; NANOPARTICLES; LUMINESCENCE; CDTE;

D O I：

10.1179/143307510X12639910071476

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, luminescent CdSe quantum dots (QDs) were modified with L-cysteine and used as a sensitive sensor for the detection of lead ion. The fluorescence of the water soluble QDs can be quenched only by Pb2+ in Kolthoff buffer solution. The optimum experimental conditions were as follows: pH=8.0, 8.0x10(-4) M L-cysteine, reaction time=3 min and reaction temperature=293 K. The fluorescence intensity of CdSe QDs was linearly proportional to lead ion concentration from 0 to 1.00x10(-6) M with a limit of detection of 8.39x10(-8) M. The fluorescence quenching mechanism was considered to be both dynamic and static quenching acting together as quenching model. The proposed method has been successfully applied to detect the content of Pb2+ in green tea, and the recoveries were found to be 102.9-108.3% with standard addition method.

引用

页码：133 / 137

页数：5

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