Cold cathodes made of carbon materials

Details Cold cathodes made of carbon materials Cold cathodes made of carbon materials

H - Electricity

01

J

H01J 1/30 (2006.01) H01J 9/12 (2006.01) H01J 19/24 (2006.01)

Patent

CA 2553597

The invention relates to electronic engineering, in particular to producing autoemission cathodes which are used in the form of an electrode source for different-purpose electrovacuum devices. The use of different materials for producing cold cathodes is one of investigation directions with respect of the use of different materials, including a hydrocarbon material based on a linear- chaining sp1-carbon. Said hydrocarbon material can be embodied in the form of carbon fibres or carbon film based on a linear-chaining sp1-carbon, including films produced by applying a carbon-powder suspension to a substrate. Said substrate can be made of a flexible material. In addition, the cathode can be made of a carbon film obtainable by the deposition thereof from carbon plasma. The inventive method for producing carbon fibres consists in carrying out the reaction of dehydrohalogenation of polymeric fibres from polyvinylidene- halogenides or polyvinyl-halogenides associated with successive heat treatment at a temperature ranging from 400 to 900 ~C in vacuum in the order of 10 4Pa. The use of the inventive cold cathodes makes it possible to produce electronic devices and light sources.

L'invention appartient au domaine de l'électronique et notamment de la fabrication de cathodes à auto-émission. Les cathodes à froid sont destinées à être utilisées dans des dispositifs électroniques à vide en tant que source d'électrons. L'un des développements des cathodes à froid est la recherche des possibilités d'utilisation de divers matériaux de fabrication, y compris d'un matériau de carbone à base d'un carbone sp?1-¿ à chaîne linéaire, notamment d'un film formé par l'application à un substrat d'une suspension de poudre de carbone. Le substrat peut être souple. En outre, la cathode peut être faite d'un film de carbone formé par dépôt de plasma de carbone. Le procédé de fabrication de fibres de carbone consiste à réaliser une réaction de deshydrohalogénation de fibres polymères à partir de polyvinylidénhalogénures ou de polyvinylhalogénures suivie d'un traitement thermique à une température entre 400 et 900 ·C dans un vide à environ 10?-4¿ Pa. Les cathodes à froid de l'invention permettent de fabriquer des sources lumineuses et des instruments électroniques.

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