Study On Electrochemical Sensor Based On The Function Of Diazonium Salts And Its Application In Environmental Detection

Graphene as a layer of sp2 hybridized carbon materials has become chemists,biologists,physicists,materials and engineers,scientists the most popular nano materials it has peculiar structure,electronic and properties mechanical,and rich chemical functional groups,and molecular.In recent years,graphene covalent and noncovalent functionalized with diazonium salts have been widely concerned.In this paper,we mainly focus on the construction of electrochemical sensors based on the function of heavy nitrogen salt,and explore its application in the field of electrochemical sensing.（1）In this work,we compared the glassy carbon electrode（GCE）of the chemical behavior,graphene/glassy carbon electrode（GNP/GCE）and diazonium salt（Ar-Cl₂）/graphene/glassy carbon electrode（Ar-Cl₂/GNP/GCE）,then the chemically modified electrodes were used for the detection of lead ion in the environment.The properties of and surface morphology the modified electrodes were characterized by atomic force microscopy,X-ray photoelectron spectroscopy,and electrochemical techniques.With glassy carbon electrode and graphene electrode copared of diazonium salt（Ar-Cl₂）/ graphene/ glassy carbon electrode（Ar-Cl₂/GNP/GCE）in the detection of lead ion,Ar-Cl₂/GNP/GCE has better detection ability of lead ion than GNP/GCE and /GCE.（2）In this work,we compared the electrochemical behavior of the glassy carbon electrode（GCE）、 graphene/glassy carbon electrode（GNP/GCE）and diazonium salt（Ar-NH₂）/graphene/glassy carbon electrode（Ar-NH₂/GNP/GCE）,then the chemically modified electrodes were used for the detection of nitrite ion and sulfite ion in the environment.The properties of and surface morphology the modified electrodes were characterized by atomic force microscopy,X-rayphotoelectron spectroscopy,and electrochemical techniques.With GCE and GNP/GCE copared of diazonium salt（Ar-NH₂）/ graphene/ glassy carbon electrode（Ar-NH₂/GNP/GCE）in the detection of nitrite ion and sulfite ion,Ar-NH₂/GNP/GCE has better detection ability of nitrite ion and sulfite ion than GNP/GCE and GCE.（3）This experiment have obtained GNP/GCE 、 Ar-NH₂/GNP/GCE and Ar-Cl₂/GNP/GCE.To compare the effect of these three kinds of electrodes behavior of negatively and positively charged redox probes in[Ru（NH3）6]2+/3+、[Fe（CN）6]3-/4-solution were investigated.And to compare the detection performance to lead ions、nitrite and sulfite ions on these three electrodes was achieved.On the basis of these results,it is proved that the positive and negative charge on the surface of graphene can be used to separate the positive and negative charge of the ion in the environment.