Multicolor electrochemiluminescence of cadmium sulfide quantum dots to detect dopamine
In this work,we synthesized water-dispersible cadmium sulfide quantum dots (CdS QDs) capped with 3- mercaptopropionic acid (MPA) in four sizes,namely 1.8,2.7,3.2 and 3.7 nm using the hydrothermal method.The obtained CdS QDs were characterized using UV-vis spectra,fluorescence spectra,X-ray powder diffraction,and transmission electron microscopy.The electrochemiluminescence (ECL) of CdS QDs was investigated in aqueous solution.With increasing the particle size of CdS QDs,not only ECL peak potentials but also ECL onset potentials were shifted positively accompanying the continuous increasing ECL intensity.Under the optimized conditions,the electrochemiluminescence of CdS QDs was used for dopamine (DA) detection linearly ranging from 8 pM to 20 nM with the detection limit of 3.6 pM(S/N=3).Furthermore,the applicability of the proposed sensor was also applied to detect DA in human urine and serum.
Electrochemiluminescence Sensor Cadmium sulfide quantum dots Size-dependent effect Dopamine
Jin-Xia Liu Shou-Nian Ding
Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research,School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189,China
国际会议
南京
英文
395-400
2016-12-23（万方平台首次上网日期，不代表论文的发表时间）