Preparation and properties of cosmo-mimetic carbon micro-coils and ceramicmicro-solenoids/micro-tubes by CVD process

Cosmo-mimetic carbon micro-coils were obtained by the catalytic pyrolysis o f acetylene with a small amount of thiophene, and the preparation condition s were examined. The oxidation of a metal catalyst strongly affects the gro wth of carbon coils. Light emission and a temperature increase of 20-25 deg rees C were observed during the reaction, and these have some relationships with the reaction of growing carbon coils. Application of a bias voltage t o the substrate was very effective for obtaining a high coil yield. The car bon coils could be graphitized by a heat treatment at 3000 degrees C for 6 hrs in a CO/CO2 atmosphere. TaC microsolenoids/micro-tubes and other cerami c micro-tubes, such as TiC, TiN, NbC, and NbN, were prepared by the vapor p hase metallizing and metallizing/nitriding of the regular and densely coile d carbon coils.