1. Preparation and properties of cosmo-mimetic carbon micro-coils and ceramic micro-solenoids/micro-tubes by CVD process
- Author
-
Mitsuhiro Fujii, T. Kuzuya, Hiroshi Iwanaga, Seiji Motojima, Xiuqin Chen, and W.-I. Hwang
- Subjects
Materials science ,General Physics and Astronomy ,chemistry.chemical_element ,Chemical vapor deposition ,chemistry.chemical_compound ,Acetylene ,chemistry ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Light emission ,Ceramic ,Metallizing ,Tin ,Pyrolysis ,Nitriding - Abstract
Cosmo-mimetic carbon micro-coils were obtained by the catalytic pyrolysis of acetylene with a small amount of thiophene, and the preparation conditions were examined. The oxidation of a metal catalyst strongly affects the growth of carbon coils. Light emission and a temperature increase of 20-25°C were observed during the reaction, and these have some relationships with the reaction of growing carbon coils. Application of a bias voltage to the substrate was very effective for obtaining a high coil yield. The carbon coils could be graphitized by a heat treatment at 3000°C for 6 hrs in a CO/CO 2 atmosphere. TaC microsolenoids/micro-tubes and other ceramic micro-tubes, such as TiC, TiN, NbC, and NbN, were prepared by the vapor phase metallizing and metallizing/nitriding of the regular and densely coiled carbon coils.
- Published
- 1999