Preparation And Application Of Carbon Nitride (gC₃N₄)/nanocarbon Composite Material Electrochemical Sensor

Graphite carbon nitride(g-C₃N₄)is the most stable allotrope of carbon nitride at ambient temperature.Due to its semiconducting properties,carbonitride has been effectively used in various photocatalytic processes.In the characteristic nanosheets of g-C₃N₄,the uniform dispersion of carbon and nitrogen elements in each nanosheet,thermal stability and tunable band gap can make it have enhanced electrochemical performance in chemical sensing applications.While g-C₃N₄ and carbon materials have strong electronic coupling,g-C₃N₄,which provides a nitrogen source,can improve the dispersibility,stability and durability of the composite.In addition,doping g-C₃N₄ can increase the surface charge density and active sites of the composite,thereby improving the electrochemical response of the composite to the analyte.The addition of metal nanoparticles allows the composite to have a larger surface area while also providing more catalytically active sites.The g-C₃N₄ composite carbon nanomaterial is combined with metal and metal oxide to construct a sensor,which can fully exert the synergistic effect of the three,expand the surface area of the composite,increase the electrocatalytic active site,and improve the overall conductivity of the composite.Based on the above characteristics,the research work carried out mainly includes the following two aspects:1.Sensors based on Au nanoparticles/carbon nitride/graphene composites for the detection of chloramphenicol and ciprofloxacin.The carbon nitride/graphene composite is synthesized in one step by calcining graphene oxide and melamine.The surface of the carbon nitride is rich in amino groups,and the composite formed by its combination with graphene significantly increases the catalytically active sites.Au nanoparticles?Au NPs?were intercalated into a carbon nitride/graphene composite to form an Au NPs/carbon nitride/graphene?Au/g-C₃N₄/GN?composite having a three-dimensional nanostructure.The introduction of Au NPs makes Au/g-C₃N₄/GN composites more sensitive and accurate for chloramphenicol and ciprofloxac in detection.2.Based on CuO/CNTs/g-C₃N₄ composite electrochemical sensor for sensitive detection of acetaminophen.Three-dimensional structure electrochemical sensors were constructed using copper oxide,carbon nitride and carbon nanotubes.Carbon nitride has good biocompatibility and stability,and its rich amino sites on the surface can be combined with more copper ions,which provides favorable conditions for uniformly supporting copper oxide on the surface of nitrogen oxides?The combination with carbon nanotubes greatly enriches the pore structure of the composite and improves its electrical conductivity.