Study On Electrochemical Properties Of Copper Matrix Composites

With the improvement of people’s living standards,the number of people affected by diabetes has increased dramatically.Monitoring blood glucose levels is an important means of preventing and treating diabetes.Glucose sensors are easily affected by the external environment,such as temperature,humidity,Ph,and other inappropriate conditions,which will lead to enzyme inactivation,thus greatly affecting the performance of the sensor.Noble metal materials have been used as electrode materials for non-enzymatic electrochemical glucose sensors for a long time,but the high price limits their large-scale commercial application.Because of its high electrochemical activity,good stability,and low price,copper-based material has become a popular material in the field of non-enzymatic electrochemical glucose sensing.In order to obtain a non-enzymatic electrochemical glucose sensor with high sensitivity,low detection limit,excellent selectivity,and low cost,the following research contents are done in this paper:（1）Cu O-Co₃O₄composite with spiny spherical morphology was prepared by a simple hydrothermal method.The size and morphology of the composites can be precisely regulated by adjusting the Cu/Co feed ratio.The thorn-like morphology is conducive to the redox reaction between the material and the analyte,the one-dimensional nanowire improves the electron transfer rate,and the rough surface provides more metal active sites.The electrochemical analysis results confirmed that the Cu O-Co₃O₄ composite material-modified electrode exhibited outstanding sensing performance for glucose in 0.1 M Na OH solution under an applied voltage of+0.55 V,with a sensitivity of 1503.45μA cm^-2 m M^-1.According to S/N=3,the detection limit was 21.95μM.It has outstanding performance in anti-interference experiments and has superior resistance to Cl^-poisoning.（2）The ambient temperature during the crystal growth of metal-organic framework（MOF）compounds was changed,and the composites were obtained by annealing MOF as a template.By adjusting different annealing temperatures to control the morphology of the product,Cu O/Ni O composites composed of nanoparticle clusters were obtained.Scanning electron microscopy（SEM）characterization results show that the MOF derivatives grown at low-temperature have more uniform and loose nanostructures,and they also exhibit better electrochemical sensing performance than products under conventional conditions in subsequent electrochemical detection.In 0.1 M Na OH solution,the Cu O/Ni O composite has a sensitivity of 4556.56μA m M^-1 cm^-2 in the glucose concentration range of 0-100μM,and the detection limit is 2.7μM.The anti-interference and anti-Cl^-Poisoning ability is very good.（3）Nanowire Cu O/Sn/S composites were prepared by hydrothermal method and vapor deposition method.The doping of Sn and S elements changes the morphology of the material,which greatly improves the electrochemical activity of the material.Benefiting from abundant active sites,the rough-surfaced one-dimensional nanowire Cu O/Sn/S composite exhibits high sensing performance in electrochemical glucose sensing tests.In the range of 0.001～0.3 m M glucose concentration,the sensitivity was as high as 4277.79μA m M^-1 cm^-2,and the detection limit was 4.59μM.