FIELD-EMISSION CATHODE Russian patent published in 2014 - IPC H01J1/30 H01J9/02 B82B3/00 

FIELD: electricity.

SUBSTANCE: result is obtained by using composite material for field-emission cathode that contains particles of metal surrounded by nanostructured carbon material (carbon or carbon-nitrogen nanotubes, carbon nanofibres, fullerene and similar materials). In order to increase efficiency of field emission the following activities are performed during fabrication of field-emission cathode: additional mechanical treatment with removal of cathode surface layer and subsequent polishing, chemical and plasma etching of operating surface. The resultant cathode provides density of field-emission current of about 10-20 mA/cm² with high stability and homogeneity.

EFFECT: obtaining stable field-emission cathode with high specific density; metal ensures low specific resistance, high thermal conductivity and mechanical strength while nanocarbon material ensures high emission properties of cathode.

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