Electrochemical Sensor Based On Ordered Mesoporous Cobalt And Mesoporous Copper Oxide Sheets

The making and use of sensitive electrodes based on mesoporous cobalt supported oncarbon materials is of practical importance when developing of simple methods for quickdetection of trace quantities of analytes. These sensors exhibit advantages such as simplicity,relatively fast response, low cost, wide linear dynamic range and ease of preparation andprocedures when compared to conventional methods. As such, the electrochemical and electrocatalytic behavior of mesoporous cobalt and ordered mesoporous copper oxide remain an areafor further exploration.Briefly, in chapter two, the ordered mesoporous Co₃O₄（OM-Co₃O₄） was prepared usingtwo-dimensional hexagonal SBA-15as hard templates. OM-Co₃O₄modified glassy carbonelectrode （OM-Co₃O₄/GCE） was used to study the direct oxidation of glucose in an alkalinemedium. The electrochemical activity of the OM-Co₃O₄and non-mesoporous Co₃O₄（NM-Co₃O₄） was investigated by cyclic voltammetry （CV）, electrochemical impedancespectroscopy （EIS） and chronoamperometry. The OM-Co₃O₄/GCE showed larger analyticalsignals in the presence of glucose than an electrode modified with NM-Co₃O₄. Thus a nonenzymatic amperometric sensor for glucose detection based on the OM-Co₃O₄/GCE wasdeveloped. The sensor exhibited a fast response time, a high sensitivity, good reproducibility,selectivity and a low detection limit in alkaline solution.Finally, in chapter tree, the mesoporous CuO （M-CuO） was prepared using silica astemplate. Direct placing of the resultant dispersion on a glassy carbon electrode （GCE）without the use of an immobilization support matrix leads to very stable CuO nanoparticle-containing films with remarkable catalytic performance toward the oxidation of glucose in0.1M NaOH solution. This glucose biosensor showed good electro catalytic performance interms of high sensitivity (33.53μA mM^-1cm^-2), low detection limit （1.2μM）, fast responsetime （3s） and linear range （1μM to30μM）.