Abstract
Silver-colored carbon adducts were grown on a graphite electrode connected to the negative lead during fullerene preparation by an electric arc method, and hemispherical carbon adducts were observed with scanning electron microscopy. The carbon adducts were also observed with transmission electron microscopy, which showed spherical carbon particles of 50-300 Å in diameter having a graphitic layered structure. X-ray diffraction measurements suggest that the graphitic stacking of the spherical carbon particles has a turbostatic layered structure. The mechanism of the formation of these carbon adducts as well as fullerenes and nanotubes is discussed on the basis of these observations and by estimation of spin concentrations of each product.
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