Highly sensitive and selective fluorescence probe for Cr3+ ion detection using water-soluble CdSe QDs

被引：33
作者：
Sung, Ti-Wen [1 ]
Lo, Yu-Lung [1 ,2 ]
Chang, I-Ling [1 ]
机构：
[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Adv Optoelect Technol Ctr, Tainan 70101, Taiwan
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2014年 / 202卷
关键词：
Cr3+; Water-soluble QDs; Sol-gel matrix; Micelle method; MODIFIED GOLD NANOPARTICLES; QUANTUM DOTS; SILICA SPHERES; CHROMIUM; GEL; SPECIATION; CR(III); PARTICLES; SAMPLES; CR(VI);
D O I：
10.1016/j.snb.2014.05.101
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A high-performance sensor for Cr3+ ion detection is proposed based on water-soluble CdSe QDs immobilized on the tip of an optical fiber in a sol-gel matrix. The CdSe QDs have many favorable properties, including good water solubility, low cytotoxicity, high quantum yield, and good resistance to photo-bleaching in aqueous solutions. The experimental results show that the fluorescence intensity of the CdSe QDs exhibits a strong quenching effect following interaction with Cr3+ ions. A linear relationship (R-2 = 0.9964) is observed between the relative fluorescence intensity (I-0/I) and the Cr3+ ion concentration for concentrations in the range of 0.1-20 mu M. In addition, the water-soluble CdSe QDs are found to be more sensitive to Cr3+ ions than to other metal ions such as Cu2+, Ce3+, Al3+, La3+, Co2+, Ba2+, Ni2+ and Ag+. In general, the results presented in this study show that the proposed sensor has significant potential for Cr3+ sensing in many environmental and biomedical applications. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：1349 / 1356
页数：8
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