Abstract
Carbon micro-coils, which is a kind of novel carbon material with a 3D double-helix/spiral structure similar to DNA, were obtained by the Ni-catalyzed pyrolysis of acetylene at 750 °C. The morphology and microstructure of these carbon coils were examined in detail. The growth mechanisms of the flat coils with slender-shaped cross-sections as well as circular coils with circular-shaped cross-sections are discussed. It is considered that the circular coils are predominantly formed during the initial growth stage and then change to flat coils with increasing reaction time because of the change in the catalyst shape from a cubic-form to a slender-form. A change in the catalyst form may be effected by the electromagnetic (EM) field (force) emitted from the outer electric heater.
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