期刊
MICROCHIMICA ACTA
卷 180, 期 11-12, 页码 1101-1107出版社
SPRINGER WIEN
DOI: 10.1007/s00604-013-1031-6
关键词
Cationic-anionic surfactant; Cadmium sulfide quantum dots; Silver
资金
- Rajamangala University of Technology Isan (RMUTI)
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), office of the Higher Education Commission, Ministry of Education, Thailand
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).
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