期刊
MICROCHIMICA ACTA
卷 175, 期 3-4, 页码 347-354出版社
SPRINGER WIEN
DOI: 10.1007/s00604-011-0666-4
关键词
CdTe quantum dot; Electrochemiluminescent sensing; Carbon nanotube; Dopamine; Indium tin oxide glass
资金
- National Natural Science Foundation of China [20275025, 20675055]
- Natural Science Foundation of Jiangsu Province [BK2009111]
- Project of Science and Technology of Suzhou [SYJG0901]
We have synthesized water-dispersible CdTe quantum dots (QDs) capped with thioglycolic acid. Their quantum yield is higher than 54%. A sensitive electrochemiluminescence (ECL) method was established based on the modification of the composite of the QDs, carbon nanotubes and chitosan on indium tin oxide glass. The sensor displays efficient and stable anodic ECL which is quenched by dopamine. A respective sensor was designed that responds to dopamine linearly in the range of 50 pM to 10 nM, and the detection limit is 24 pM. Dopamine was determined with this sensor in spiked cerebro-spinal fluid with average recoveries of 95.7%.
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