Metallic carbon materials

Details Metallic carbon materials Metallic carbon materials

1996-05-14

1999-11-30

Langel, Wayne

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

423445B, 423445R, 4234472, H01B 104, C01B 3100

Patent

active

059936975

ABSTRACT:
Novel metallic forms of planar carbon are described, as well as methods of designing and making them. Nonhexagonal arrangements of carbon are introduced into a graphite carbon network essentially without destroying the planar structure. Specifically a form of carbon comprising primarily pentagons and heptagons, and having a large density of states at the Fermi level is described. Other arrangements of pentagons and heptagons that include some hexagons, and structures incorporating squares and octagons are additionally disclosed. Reducing the bond angle symmetry associated with a hexagonal arrangement of carbons increases the likelihood that the carbon material will have a metallic electron structure.

REFERENCES:
patent: 5110577 (1992-05-01), Tamor
patent: 5401975 (1995-03-01), Ihara
patent: 5626812 (1997-05-01), Ebbesen
Iijima, S. "Growth of Carbon Nanotubes," Materials Science and Engineering, B19 (1993), pp. 172-180.
Dunlap, B. I. "Connecting Carbon Tubules," Physical Review B, vol. 46, #3, pp. 1933-1936, Jul. 1992.
Ajayan, P. M. et al., "Distribution of Pentagons and Shapes in Carbon Nanotubes," Chem. Phys. Lett., vol. 202, No. 5, pp. 384-388, Jan. 1993.

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