Detection of silver(I) ion based on mixed surfactant-adsorbed CdS quantum dots

被引：8

作者：

Butwong, Nutthaya ^{[1
,2
]}

Ngeontae, Wittaya ^{[1
,2
]}

Burakham, Rodjana ^{[1
,2
]}

Srijaranai, Supalax ^{[1
,2
]}

机构：

[1] Khon Kaen Univ, Fac Sci, Dept Chem, Mat Chem Res Unit, Khon Kaen 40002, Thailand

[2] Khon Kaen Univ, Fac Sci, Ctr Excellence Innovat Chem, Khon Kaen 40002, Thailand

来源：

MICROCHIMICA ACTA | 2013年 / 180卷 / 11-12期

关键词：

Cationic-anionic surfactant; Cadmium sulfide quantum dots; Silver; PHOTOLUMINESCENCE; MIXTURES; GROWTH; PROBE;

D O I：

10.1007/s00604-013-1031-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mixed cationic and anionic surfactants were adsorbed on cadmium sulfide quantum dots (CdS QDs) capped with mercaptoacetic acid. The CdS QDs can be extracted into acetonitrile with 98 % efficiency in a single step. Phase separation only occurs at a molar ratio of 1:1.5 between cationic and anionic surfactants. The surfactant-adsorbed QDs in acetonitrile solution display stronger and more stable photoluminescence than in water solution. The method was applied for determination of silver(I) ion based on its luminescence enhancement of the QDs. Under the optimum conditions, the relative fluorescence intensity is linearly proportional to the concentration of silver(I) ion in the range between 50 pmol L(-1)and 4 mu mol L-1, with a 20 pmol L-1 detection limit. The relative standard deviation was 1.93 % for 9 replicate measurements of a 0.2 mu mol L-1 solution of Ag(I).

引用

页码：1101 / 1107

页数：7

共 23 条

[21] Benzene removal from waste water using aqueous surfactant two-phase extraction with cationic and anionic surfactant mixtures [J].