Preparation And Application Of Graphene Analogs And Conductive Polymer Composites

Conducting polymers have good electronic and ionic conduction ability,as well as the unique physical and mechanical properties have better fit with nerve tissue.Poly(3,4-ethyleneddioxythiophene)(PEDOT),as a kind of thiophene derivatives,has high electrical conductivity,high stability and good film-forming characteristics.Carbonnanotube(CNT)has unique physical and chemical properties,such as large specific surface area,high conductivity coefficient,the length to diameter ratio,good mechanics performance and fast electron transfer rate.g-C3N4 has a low coefficient of friction,high chemical stability,good biocompatibility,high insulation,high heat conductivity and wide energy gap.In this paper,when electrochemical method was used as the determination technique,three types electrodes were developed due to the excellent performance of the carboxyl carbon nanotubes(CNTs),g-C3N4 and PEDOT.The main content and results are listed as following:1.CNTs were electrodeposited onto the surface of Au electrodes.Arginine-glycine-aspartic acid(RGD)was connected to CNTs by condensation reaction of amide linkage.Raman spectra,ATR-FTIR spectra,field emission scanning electron microscopy(FESEM),contact angle and electrochemical characterization of PEDOT?PEDOT/CNTs and PEDOT-CNTs-RGD were studied to identify the material on the electrode surface.In the result of functional groups of electrode surface and the change of the morphology and impedance,we found the CNTs was doped into the PEDOT and connected to the RGD.The high conductivity of PEDOT/CNTs-RGD electrode was obtained.2.Melamine,as a raw material,was used to prepare carbon nitride semiconductor graphite phase(g-C3N4).On the basis of g-C3N4,a doped gold nanoparticle of g-C3N4(Au-g-C3N4)was got.Then we gained PEDOT/g-C3N4 electrode and PEDOT/Au-g-C3N4 electrode by layer self-assembly.3.Electrochemical impedance spectrum(EIS)was applied to study the role of PEDOT/g-C3N4 electrode and PEDOT/Au-g-C3N4 electrode in biological fluids.The results proved that PEDOT/g-C3N4 and PEDOT/Au-g-C3N4 improved the sensitivity of the electrical signal greatly.To better understand the biocompatibility of the electrodes,PC-12 cell was chosen to investigate toxicity and biological compatibility of electrodes in vitro experiment.The results showed that two kinds of composite had the characteristics of low toxicity and good biocompatibility.4.In the research of the electrochemical performance of PEDOT/g-C3N4 electrode,we found that it had remarkable capacitance.By the following,PEDOT/g-C3N4 was explored in the field of supercapacitor.Supercapacitor with high capacitance was gained by the method of cyclic voltammetry(CV)as the testing technique.