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US 7,018,602 B2Granted
Carbon fiber for field electron emitter and method for manufacturing field electron emitter
AssigneesGSI Creos Corporation, Morinobu Endo
InventorsTakashi Yanagisawa, Morinobu Endo
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Abstract
A carbon fiber for a field electron emitter has a coaxial stacking morphology of truncated conical tubular graphene layers, each of which includes a hexagonal carbon layer and has a large ring end and a small ring end at opposite ends in the axial direction. The edges of the hexagonal carbon layers are exposed on at least part of the large ring ends. Since all the exposed edges function as electron emission tips, a large amount of emission current can be obtained.
Claims8
A stacked cup carbon nanofiber for a field electron emitter comprising:
- a coaxial stacking morphology of vapor grown truncated conical tubular graphene layers, each of which includes a hexagonal carbon layer in the shape of a hollow cup not having a bottom, and has a large ring end and a small ring end at opposite ends in an axial direction,
- wherein edges of the hexagonal carbon layers are exposed on at least a portion of the large ring ends by removing a deposited film of an excess amount of pyrolytic carbon formed during vapor growth,
- wherein the exposed edges function as electron emission tips, and
- wherein the stacked cup carbon nanofiber has a round cross-section.
1 more element
Dependencies are inferred from the claim text.