CATALYTIC EFFECTS OF METAL CARBIDES, OXIDES AND NI SINGLE CRYSTAL ON THE VAPOR GROWTH OF MICRO-COILED CARBON FIBERS

摘要

Micro-coiled carbon fibers were prepared by the impurity-activated chemical vapor deposition using the powders of metal carbides, metal oxides, and a Ni single crystal. The catalytic effect of these impurities on the coil yield and morphology were examined, and the growth mechanism is discussed. The pre-oxidized Ti plate, Ti2O3 and TiC powders, and a Ni single crystal as well as various metal powders provided the micro-coiled carbon fibers. For the Ni single crystal, the Ni(100) crystal gave the highest coil yield followed by Ni(111) and then Ni(110). It is considered that the anisotropic deposition rate of a carbon among the Ni single crystal planes is the driving force of the coiling of carbon fibers to form the coiled fibers. [References: 30]