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Carbon Microfibers Grown on Graphite Electrode During Fullerene Generation Using Composite Graphite Rods

Using carbon/metal composite electrodes, silver-colored carbon deposits were obtained on the top edges of negative electrodes during electric arc vaporization for fullerene generation. Needle-shaped, rod-shaped, and winding carbon fibers 20–30 µm in length and 3–4 µm in diameter were observed on the surface of the deposits, using a scanning electron microscope (SEM). The results of energy-dispersive X-ray (EDX) microanalysis on the fibers showed that metal carbides exist at the top portions of these fibers. It was suggested that the growth of such fibers was induced by the catalytic activity of small clusters of metal carbides which act as seeds. The structures of the fibers were discussed based on these experimental results.