A luminescent nanosensor for Hg(II) based on functionalized CdSe/ZnS quantum dots

被引：48
作者：
Li, Haibing [1 ]
Zhang, Yan [1 ]
Wang, Xiaoqiong [1 ]
Gao, Zhinong [2 ]
机构：
[1] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol CCNU, Wuhan 430079, Peoples R China
[2] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
来源：
MICROCHIMICA ACTA | 2008年 / 160卷 / 1-2期
关键词：
quantum dots; L-carnitine; mercury ions; determination;
D O I：
10.1007/s00604-007-0816-x
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Luminescent and stable CdSe/ZnS core/shell quantum dots (QDs) capped with L-carnitine are firstly prepared for optical determination of mercury ions in ethanol. LC capped QDs have desirable dispersibility, uniformity and good fluorescence properties and were characterized by fluorescence spectroscopy, transmission electron microscopy and infrared spectra. The functionalized QDs turned out to exhibit excellent long-term stability. The modified QDs allowed a highly sensitive determination of mercury ions via analyte-induced changes in the photoluminescence of them. A detection limit of 1.8 x 10(-7) M (36.1 mu g center dot L-1) of mercury ions was obtained, while the interfering effect of other ions (including alkali metal ions, alkali earth metal ions, Ni2+, Zn2+, Fe2+, Ag+ and anions such as NO3-, SO42-, CO32- and halogen ions) was negligible even at a very high concentration. The possible mechanism is discussed.
引用
收藏
页码：119 / 123
页数：5
相关论文
共 22 条
[1]   DETERMINATION OF VOLATILE MERCURY SPECIES AT THE PICOGRAM LEVEL BY LOW-TEMPERATURE GAS-CHROMATOGRAPHY WITH COLD-VAPOR ATOMIC FLUORESCENCE DETECTION [J].
BLOOM, N ;
FITZGERALD, WF .
ANALYTICA CHIMICA ACTA, 1988, 208 (1-2) :151-161
[2]   Ecological effects, transport, and fate of mercury: a general review [J].
Boening, DW .
CHEMOSPHERE, 2000, 40 (12) :1335-1351
[3]   CARNITINE - METABOLISM AND FUNCTIONS [J].
BREMER, J .
PHYSIOLOGICAL REVIEWS, 1983, 63 (04) :1420-1480
[4]   Semiconductor nanocrystals as fluorescent biological labels [J].
Bruchez, M ;
Moronne, M ;
Gin, P ;
Weiss, S ;
Alivisatos, AP .
SCIENCE, 1998, 281 (5385) :2013-2016
[5]   Luminescent quantum dots for multiplexed biological detection and imaging [J].
Chan, WCW ;
Maxwell, DJ ;
Gao, XH ;
Bailey, RE ;
Han, MY ;
Nie, SM .
CURRENT OPINION IN BIOTECHNOLOGY, 2002, 13 (01) :40-46
[6]   Quantum dot bioconjugates for ultrasensitive nonisotopic detection [J].
Chan, WCW ;
Nie, SM .
SCIENCE, 1998, 281 (5385) :2016-2018
[7]   Luminescent CdS quantum dots as selective ion probes [J].
Chen, YF ;
Rosenzweig, Z .
ANALYTICAL CHEMISTRY, 2002, 74 (19) :5132-5138
[8]  
DONATO SD, 1992, L CARNITINE ITS ROLE, P81
[9]  
EPA US, 2005, EPA452R05003
[10]   Peptide-coated CdS quantum dots for the optical detection of copper(II) and silver(I) [J].
Gattás-Asfura, KA ;
Leblanc, RM .
CHEMICAL COMMUNICATIONS, 2003, (21) :2684-2685
123