A technique to synthesize thin-walled carbon nanotubes (CNTs) was developed by catalytically pyrolysising of ferrocene/dichlorobenzene solution. The ratio of inner diameter of CNT to thickness of CNT wall, δ, was defined as a criterion to evaluate the extent of CNT cavity. The effects of flowing rate of hydrogen, reaction temperature, and concentration of catalyst on δ were studied. The optimized parameters for synthesizing thin-walled CNTs were obtained. The thin-walled CNTs with δ=5. 6 were synthesized at temperature of 850℃, Ar/H2 flowing rate of 500/200ml/min, ferrocene concentration of 0. 06g/ml, and feeding rate of solution of 0. 012ml/min.
carbon nanotubesthin-walled carbon nanotubesthin-walled index
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