Synthesis Of Carbon Nanotubes Using A Novel Catalyst Derived From Layered Double Hydroxide Precursor

Carbon nanotubes are a kind of novel function materials with a 2-D sheet of tubular structure. Due to their special structure, nanotubes offer strong quantum effect and unique physics chemical properties and thus are looked upon as promising candidates in a lot of applications, such as catalysis, multi materials, deposited materials, miniaturized electronic and etc. Nowadays, Various methods, such as arc-discharge, laser ablation, hydrocarbon pyrolysis, catalytic chemical vapor deposition (CCVD) and etc, have been successful in producing CNTs materials, but low yield and production in miniature are the main disadvantages for the former three methods; and then CCVD method becomes the mainly production method of CNTs for it's simple reactor, low cost, controlled reaction and high yield.Layered double hydroxides (LDHs), are a class of layered function materials. Based on the fact, in this thesis we put forward the substitution by Co, Ni, Fe in hydrotalcite layers to synthesize M²⁺-M³⁺-LDHs,which are potential precursors of catalysts for CNTs growth. Then, CNTs were synthesized via the catalytic chemical vapor deposition (CCVD) method over these catalysts in quartz reactor.This thesis compares the novel catalyst's capability advantages over the traditional catalyst; study the effects of composition, ration, calcined temperature of the precursor and growth temperature on the CNTs growth,...