Electron-emitting source having carbon nanotubes

Details Electron-emitting source having carbon nanotubes Electron-emitting source having carbon nanotubes

2008-07-01

2008-07-01

Guharay, Karabi (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

C313S310000

Reexamination Certificate

active

07394192

ABSTRACT:
A method of manufacturing an electron-emitting source includes first to third steps. In the first step, a cathode structure made of a metal containing any one of ion, nickel, cobalt, and chromium is heated to a first temperature in a reaction furnace to which a carbon source gas has been introduced, to form a plurality of first carbon nanotubes on the cathode structure by chemical vapor deposition. In the second step, the metal serving as a material of the cathode structure is deposited on at least either one of the cathode structure and the plurality of first carbon nanotubes, to form a catalyst metal layer. In the third step, the cathode structure including the catalyst metal layer is heated to a second temperature higher than the first temperature in the reaction furnace to which the carbon source gas has been introduced, to form a plurality of second carbon nanotubes which are thinner than the first carbon nanotubes on the catalyst metal layer by chemical vapor deposition. An electron-emitting source is also disclosed.

REFERENCES:
patent: 2005/0032255 (2005-02-01), Kitamura et al.
patent: 2005/0275329 (2005-12-01), Hiraki et al.
patent: 2001-048512 (2001-02-01), None

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