Graphite Polyhedral Crystals
Polyhedral nano- and microstructures with shapes of faceted needles, rods,
rings, barrels, and double-tipped pyramids, which we call graphite polyhedral
crystals (GPCs), have been discovered. They were found in pores of glassy
carbon. They have nanotube cores and graphite faces, and they can exhibit
unusual sevenfold, ninefold, or more complex axial symmetry. Although some
are giant radially extended nanotubes, Raman spectroscopy and transmission
electron microscopy suggest GPCs have a degree of perfection higher than in
multiwall nanotubes of similar size. The crystals are up to 1 micrometer in cross
section and 5 micrometers in length, and they can probably be grown in much
larger sizes. Preliminary results suggest a high electrical conductivity, strength,
and chemical stability of GPC.
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