Cvd Preparation Of Carbon Nanotube Catalyst Preparation Process

Carbon nanotubes as a novel form of carbon were discovered in 1991,which can be thought of as a rolled-up sheet of hexagonal ordered two-dimensionality graphite formed to give a seamless cylinder. They can be from several to l00nm in diameter with lengths up to l00mm.Carbon nanotubes can be divide into single-walled nanotubes(SWCNTs) and multi-walled carbon nanotubes(MWCNTs) .Recently, due to the variety of extraordinary properties ethibited by carbon nanotubes, a large of possible application have been proposed and attract people's eyes.The preparation method of carbon nanotubes including: graphite electric arc law, chemical vapor deposition law (CVD law), laser-ablation methods, support method etc. The CVD law is one preparation technology and instrument equipment relatively simple and suitable for the great large-scale production, the apt method to realize industrialization. The very key problem that the preparation of carbon nanotubes by CVD law is the catalyst. There's no function of catalyst, can't prepare out carbon nanotubes. So prepare high catalysis activation and high catalyst of alternative become the key of producing high pure carbon nanotubes.This paper studied the technologies for synthesis of carbon nanotubes catalyst, and it including the choice of technologies process, proportion of material, reagent of deposition, silicon choice of source, metal choice and that how to influence the catalysis activation and production. This thesis look for the better preparation technology through the experiment. In the technology, silicon sol as silicon source, nickel as metal source(the moles proportion is 1:12), NaOH as reagent of deposition. The precursor was prepare by sol-gel process, then using hydrothermal method preparing the nanometer catalysis of high activation and high dispersion and the reaction temperature is 200 癈, the reaction pressure is 1.5 MPa. The SEM shows that using the catalysis can prepare carbon nanotubes that of high producing rate and size of 8-15 nm. In the method material cost is low, expenditure of operation is compare to low, and the quality carbon nanotubes is good.