Single-shell nanotubes of carbon were produced by vapor-phase condensation on highly oriented pyrolytic graphite (HOPG). Atomic-resolution images were obtained using a scanning tunneling microscope (STM). The nanotubes are 1 nm wide and up to 20 nm long. The atomic structure of a zigzag configured tube is identified. A C60 hemisphere with threefold symmetry could be the nucleation seed for its growth.
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Ge et al. (1994) studied this question.
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