Doped Qds Based Photoeletrochemical Sensors For Detection Of H₂O₂and Glucose

Because Quantum Dots (QDs) has the special optic, electrical and chemical properties, it had a wild application in the field of biochemical measurement. When doped QDs formed by the QDs incorporated trace transition metal ions or rare earth metal, the doped QDs offer new optical, electrical and chemical properties that not found in non-doped QDs. It not only retain all of the advantages of the QDs, but also avoid the shortcomings of self-quenching, cytotoxicity and short dopant emission lifetime, which has a great significant of improving the properties of QDs based sensors. Doped QDs based optical and electrochemical sensors had been well studied, but much less attention are paid to the photoelectrochemical properties and their potential application in biochemical detection.In this paper, we try to build new photoelectrochemical sensors with doped QDs and have a study on the performance of the sensor to realize the detection of H2O2and glucose. Firstly, We made the doped QDs fixed on Au electrode through1,4Benzenedithiol to be a doped QDs based sensors. Secondly, the sensors were tested under different applied potentials and light sources to optimize the measurement conditions. Thirdly, the sensing properties of doped QDs on H2O2were given, which have been compared with the results from other QDs. Cu doped QDs showed better sensing properties. Finally, detection of glucose was achieved by doped QDs based photoelectrochemical sensors. From the experimental results, it can be concluded that the doped QDs based sensors designed by us can be used to detect H2O2and glucose.