Copper Nanomaterials Electrochemical Sensors And Its Application For The Detection Of Hydrogen Peroxide And Phenols

The advent of the theory of chemical modified electrode(CME) had broken through the traditional concept of electrode/electrolyte interface and initiated a new research field of controllable electrode interface.The CME can be endowed by assembling or clipping the variety of functional groups of organic,inorganic compounds complexes and polymers still the special morphology of porous, micro and nanometer materials. By using the unique modifier, the selectivity and sensitivity can be improved and the intended function can be realized. In this thesis, the methods were studied to synthesis copper nanaomaterials and prepare the modified electrodes for the detection of hydrogen peroxide(H2O2) and hydroquinone(HQ), catechol(CC). The main points of this thesis are briefly summarized as follow:1. During this experiments, ligend and copper complex were synthesised through hydrothermal and standing volatilization; besides the copper nanomaterials were synthesised through oxidation and reduction copper(II) ion. Scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD) and UV-Vis were used to explore the morphology and chemical structure of copper complex and copper nanomaterials.2. The copper complex was immobilized on the surface of Au electrode through Au-S covalent bonds to form a self-assembled monolayer. Under the optimum conditions, the ultralow detection limit of 0.042 μM(S/N= 3) is achieved and the linear concentration is 0.05-60 μM with the correlation coefficients of 0.9988. The modified electrode allowed sensitive,stable and fast electrochemical sensing of H2O2. The analysis of medical disinfection solution real samples was performed using the proposed method and the satisfactory results.3. A green, fast and facile approach for the preparation of nanomaterial to make the modified glass carbon electrode(GCE) is achieved. Then the modified GCE was applied for the simultaneous determination of HQ and CC. Under the optimized condition, the calibration curves for HQ and CC were obtained in the range of 3 to 120 μM for HQ and 4 to 115 μM for CC, with detection limits(S/N = 3) of 1.2 μM and 1.5 μM, respectively. Therefore, our research can provide a promising sensing platform for a variety of electroanalysis applications.