| Carbon is one of the most widely distributed and active elements in the earth's crust.It is widely used in so many aspects of human production and life.In recent years,due to its excellent characteristics,carbon electrode become much popular in the field of developing microelectrode.Carbon electrode has abundant raw materials and lower cost.The lightweight and flexible characteristics of carbon fiber make it more convenient to process into micro devices.Therefore,carbon fiber electrode is expected to be used in the future development of electrodes.Since carbon fiber electrode itself has the defect of poor electrical conductivity,it is very urgent to modify carbon fiber electrode effectively.Nanoparticles are famous for their super physical properties at the micro scale.Many nanoparticles have abnormal effects that are completely different from macroscopic substances.Their super surface effect,superconducting effect and catalytic activity make them shine in the field of microelectrode application.However,according to different electrode performance requirements,how to reasonably modify carbon fiber electrode with nanoparticles is the main problem at present.This paper is devoted to the design of light and small nano particle modified carbon fiber and graphite fiber electrode materials.The concrete research is as follows:1.The design of carbon fiber electrode(CFE)composite material with surface vapor deposition of carbon nanotubes(CNTs).Carbon nanotubes have good dispersion and high specific surface area.Meanwhile,the hollow structure can effectively slow down the volume growth,improve the stability of the system,and can provide particle transport channels,effectively reduce the electrode impedance and improve the electrode conductance.At the same time,carbon nanotube modified carbon fiber electrode(CNTs-CFE)showed excellent sensitivity for detecting dopamine(DA)in the simulated real body fluid environment of uric acid(UA)and ascorbic acid(AA).The experimental preset concentration range was 0.02?0.8mm.The detection limits of AA,DA and UA were 10.0?M,0.03?M and 0.6?M,respectively,which showed a strong anti-interference ability and a specific ability to detect dopamine.2.Using graphite fiber(GF)instead of carbon fiber(CF)as the matrix electrode material,a composite graphite fiber electrode(GOD-GO/Au NPs/GFE)modified with GO and gold nanoparticles(Au NPs)and equipped with GOD(glucose oxidase)was designed.At the same time,the introduction of GO increases the specific surface area and improves the electrochemical performance.The uniform grafting of gold nanoparticles on the surface of GO/graphite fiber electrode can improve the electrode conductivity,prevent agglomeration,and expand the transport channel of electrons and conductive particles.Under the synergistic action of GO,Au NPs and GFE,the electrode material showed good catalytic performance.The enzymatic activity of GOD on the surface of GFE was measured by cyclic voltammetry at a scanning rate of 50 m V·s-1 in 0.1 m M PBS solution with different concentrations of glucose.The C-V images of GOD/Au NPs/GO/GFE showed clear oxidation peaks.3.Carbon nanofibers(CNFs)were grown on the surface of carbon fibers(CF)by chemical vapor deposition(CVD),and copper nanoparticles were electrodeposited on the surface by electrochemical deposition.The growth of carbon nanoparticles on the surface of carbon nanofibers can not only increase the specific surface area and improve the stability,but also broaden the transport path of charged particles.Carbon nanofibers and form a three-dimensional conductive network can improve the electrical conductivity of the material.The introduction of nanometer copper is a selective reinforcement of the electrode.The high sensitivity of copper to nitrate makes the electrode have a strong ability to detect nitrate.In the actual detection simulation,the lower limit of nitrate detection can be reached at 0.8?m,showing its super sensitivity. |
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