THE MICRO-MORPHOLOGIES OF MICRO-HELIX CARBON FIBERS PREPARED IN A VAPOR PHASE

Carbon fibers with micro helix forms were grown by metal catalyzed pyrolysis of acetylene in a chemical vapor deposition process with high reproducibility. They are double helical fibers, similar to DNA, two sub fibers coil in the same direction around the coil axis, forming coils with a diameter of about 5 μm. The reaction temperature and ratio of gas flow rates of acetylene and hydrogen have important influence on the yield and morphology of the product.