Effects of Ni Coated Cordierite Catalyst on Flame Synthesis of Carbon Nanotubes
堇青石载镍催化剂对燃烧合成碳纳米管的影响

Catalyst particles coated uniformly on cordierite surface through dipping-method in nickel nitrate solution, were used to synthesize carbon nanotubes via methane diffusion flame method. Well-graphitized carbon nanotubes were synthesized with outer diameters of 30--50nm and length of tens of micron meter. The results show that diameters of carbon nanotubes are not affected by the size of particles on substrate surface, which increase with the concentration of dipping solution. When catalyst particles become denser with dipping time extending, the density of carbon nanotubes increases obviously with bound morphology. The catalytic mechanism is discussed in detail to propose the growth of carbon nanotubes and suggests the possible changes of particles during this process.