Exploring a new rapid colorimetric detection method of Cu2+ with high sensitivity and selectivity

被引:59
|
作者
Miao, Li-Jing [1 ,2 ,3 ]
Xin, Jun-Wei [2 ,3 ]
Shen, Zhe-Yu [2 ,3 ]
Zhang, Yu-Jie [2 ,3 ]
Wang, Hai-Yan [1 ]
Wu, Ai-Guo [2 ,3 ]
机构
[1] Anhui Normal Univ, Coll Chem & Mat Sci, Anhui Key Lab Chemobiosensing, Wuhu 241000, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Div Funct Mat & Nano Devices, Ningbo 315201, Zhejiang, Peoples R China
来源
SENSORS AND ACTUATORS B-CHEMICAL | 2013年 / 176卷
关键词
Colorimetric detection method; Copper ion; Redox etching; Silver nanoparticles; High sensitivity; Selectivity; FLUORESCENT SENSORS; GOLD NANOPARTICLES; COPPER; PRECONCENTRATION; ABSORPTION; DYNAMICS; CYSTEINE; CADMIUM; MERCURY; SAMPLES;
D O I
10.1016/j.snb.2012.10.070
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this study, we propose a new rapid colorimetric detection method of Cu2+ with high sensitivity and selectivity utilizing starch-stabilized silver nanoparticles (AgNPs), which are synthesized by a green chemistry way. AgNPs gradually become smaller in the presence of Cu2+ due to redox reaction between Ag and Cu2+, which results in color change and UV-vis absorption decrease of the nanoparticle dispersion. Therefore, Cu2+ could be recognized by visualizing the color change of AgNPs dispersed by naked eyes, and quantitatively measured by UV-vis spectra. There is a linear relationship between the absorbance ratio (A(0)/A, at 400 nm) and the concentration of Cu2+ ranging from 0.1 mu M to 10 mu M. The linear coefficient is 0.9968. The lowest detectable concentration is 0.5 mu M by naked eyes. Furthermore, the selectivity of this detection system for Cu2+ is excellent comparing with other metal ions, such as Hg2+, Co2+, Ba2+, Zn2+, Na+, Fe3+, Sr2+, Pb2+, Cd2+, Ni2+, Ca2+, Mg2+, Mn2+ and K+. The high sensitivity and selectivity of the Cu2+ detection system are ascribed to the unique redox reaction between Ag and Cu2+. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:906 / 912
页数:7
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