Preparation of Multi-walled Carbon Nanotubes by CVD over Transition Metal Catalyst Supported on Nanocrystallite CaCO3

Abstract

Abstract: Multi-walled carbon nanotubes(MWNTs) were synthesized by chemical vapor deposition(CVD) over transition metal catalyst supported on nanocrystalline CaCO₃. The compositions and the preparation conditions of the catalysts were studied and the nanotubes synthesized were characterized by field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), high transmission electron microscopy(HREM), XRD and Raman spectroscopy. The results show that the high specific surface area of nanocrystallite CaCO₃ has the advantage to load metal nanoparticles with a high density. The prepared Fe-Co bimetallic catalyst was the best catalyst for CNTs synthesis. An ideal condition for CNTs′ forming is 700 ℃ for 60～90 min with proper decomposition speed of nanocrystallite CaCO₃ at early stages of CNTs synthesis, and the yield of CNTs with the outer diameter of 15～25 nm is 11 g MWNTs/g catalyst. The purity can reach 97% by sonication in 30% nitric acid based on thermal gravimetric analysis results. The structures of the carbon nanotubes were not damaged proved by Raman spectroscopy.

Key words: Carbon nanotubes, Nanocrystalline calcium carbonate, Chemical vapor deposition(CVD)

CLC Number:

O613.71

TrendMD:

LUO Zhi-Qiang, ZHANG Xiao-Bin, CHENG Ji-Peng, LI Yu, LIU Fu, TAO Xin-Yong, YIN Wan-Zhong, HAN Yue-Xin . Preparation of Multi-walled Carbon Nanotubes by CVD over Transition Metal Catalyst Supported on Nanocrystallite CaCO₃[J]. Chem. J. Chinese Universities, 2004, 25(10): 1879.

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Preparation of Multi-walled Carbon Nanotubes by CVD over Transition Metal Catalyst Supported on Nanocrystallite CaCO₃

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