Synthesis of Diamond, Carbon Nanotubes and Carbides

Diamonds were first synthesized through a high-temperature and high-pressure process [50]. Using diamond seeds, micrometer-sized diamonds have been grown in a hydrothermal process at 800 °C and 1.4 kbar [51]. Chemical vapor deposition (CVD) is a low-pressure technique for the preparation of polycrystalline diamonds films using CH4 or C2H2 as a carbon source [52]. 

In the reaction, the freshly formed free Cg species can assemble into hexagonal carbon clusters, which can grow into nanotubes at the surface of the catalyst par- 

Cubic- or jS-SiC nanorods are very attractive semiconductors with potential ap- 

SiCU + CCI4 + 8Na SiC + 8NaCl C + SiCU + 4Na SiC + 4NaCl Si + CCI4 + 4Na SiC + 4NaCl 

When carbon was used instead of CCI4, 8-12 nm nanocrystalline TiC was also obtained at 650 °C [69]. 

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