Carbon Nanofibers Catalyzed By Carbide Nano-particles And Copper Coated TiO₂ Nanotube Arrays

SiC,TiC nanoparticles were prepared by arc plasma method,copper coated TiO2 nanotube arrays were prepared by anodic oxidation and magnetron sputtering,the growth of carbon fiber were catalyzed by SiC,TiC and copper coated TiO2 nanotube arrays in a chemical vapor deposition(CVD)reaction with with acetylene as carbon source.Specific research work is as follows.1.Silicon carbide nanoparticles were prepared by hydrogen arc plasma method.These nanoparticles were used to catalyze the growth of carbon fibers in tubular furnace with acetylene as carbon source.The morphology of silicon carbide nanoparticles and carbonfibers were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscope(TEM).The result shows that,the SiC nanoparticles were FCC P-SiC(3C-SiC)crystal,the CNFs were symmetrically grown with the catalyst particles as the center,the diameter of the CNFs were roughly similar to the diameter of the SiC particles;the CNFs were helical when the catalyst particles were single crystal,and were lineary when the catalyst particles were polycrystal.2.Titanium carbide nanoparticles were prepared by arc plasma method.Then these nanoparticles catalyzed the growth of carbon fibers with acetylene as carbon source.The reaction occurred in the tubular furnace.The morphology of titannium carbide nanoparticles and carbonfibers were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and high resolution transmission electron microscopy(HRTEM),the result shows that,the TiC nanoparticles are FCC crystal,with a diameter between 20 nm and 50 nm,the CNFs were lineary or helical grown symmetry with the catalyst particles as the center,the diameter of the CNFs was similar to the diameter of the TiC particles.3.Carbon nanofibers were prepared on TiO2 nanotube arrays templates via CVD method with acetylene as the carbon source and copper as the catalyst.The TiO2 nanotube arrays templates were prepared by anodic oxidation method and copper was deposited by a magnetron sputtering machine.The product was characterized by SEM,the result show that,the carbon nanofiber was well ordered in limited condition;all of the CNFs were linear.Futher research was focused on the voltage of the anodic oxidation step;the duration of copper plating;the duration of CVD step.The result show that,when the anodic oxidation voltage was 50 V the TiO2 nanotube arrays obtained were more suitable for follow-up experiments;the form of the carbon nanofiber obtained on the template on which the duration of copper plating was 30 min was better than the other two groups.