Study on CdTe Quantum Dots Electrochemiluminescent Sensor Supported by Carbon Nano-tubes With ITO Basal Electrode

摘要

The water soluble CdTe quantum dots (QDs) was synthesized with modified method. Its quantum yield was characterized for higher than 54%. Therefore a novel sensitive electrochemiluminescent (ECL) sensor was constructed based on the modification of composite of CdTe QDs, carbon nanotubes (CNTs) and chitosan (CHIT) on indium tin oxide (ITO) glass. After heat-treatment by infrared radiation, meanwhile with the co-reactant, triethylamine (TEA), the proposed sensor showed excellent anodic ECL efficiency and stability. This ECL sensor responded the dopamine (DA) in a wide linear range from 50pM to lOnM with a detection limit of 24pM due to the quenching effect from DA. The DA contents in practical biological samples of cerebro-spinal fluid were detected with satisfactory recovery of average 95.7%.