Preparation And Properties Of Doped Carbon Nanotube Composite Films

Due to their mechanical,chemical and electrical properties,carbon nanotubes(CNTs)are widely used in the development of micro-nanoelectronic devices.Doping CNTs with transition metals can reduce the contact resistance of CNTs and improve the service life of the device.In this work,transition metals were doped on the surface of CNTs,then doped CNT composite films and doped CNT modified glassy carbon electrodes were prepared respectively,and related performance tests were carried out.Pd doped CNTs were prepared by using the electroless deposition method,and Ni doped CNTs were prepared with metal organic framework as a medium.The effect of transition metal doping on the electrical contact properties of CNTs was studied.Nidoped CNTs/polyaniline obtained by in-situ polymerization was mixed with nylon 6 to prepare Ni-doped CNTs/polyaniline/nylon 6 fiber films by electrospinning.Glassy carbon electrodes and carbon cloth were modified by Pd-doped and Ni-doped CNTs/polyvinyl alcohol,and the modified carbon cloth was used as electrode material to assemble supercapacitors.And cyclic voltammetry tests and AC impedance tests on the fiber films,glassy carbon electrodes and supercapacitors were performed.The results show that the contact resistances of Ni-doped and Pd-doped CNTs are respectively 55.34% and 54.48% lower than that of pristine CNTs.Doping can improve the electrical contact performance of CNTs effectively.The specific surface area of the Ni-doped CNT fiber films is 20.97 m~2/g,and the specific capacitance is 3.51 F/g.The specific capacitances of glassy carbon electrodes modified by Ni-and Pd-doped CNTs are respectively 5.99 F/g and 9.89 F/g.The specific capacitances of supercapacitors assembled using carbon cloth modified by Ni-and Pd-doped CNTs are respectively 61.92 m F/g and 175.77 m F/g.Hence,Ni doping increases the specific surface area and specific capacitance of the fiber films,and Pd doping reduces the conducting resistance of CNT modified glassy carbon electrodes and supercapacitors,improving the electrochemical performance of supercapacitors effectively.The results can serve as a reference for the application of CNT composite films in supercapacitors and other fields.Figure 48;Table 7;Reference 83...