Patent ID: 11929249
Assignee: NCX CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming a field emission cathode, comprising:
mixing a plurality of carbon nanotubes and a solution at a particular ratio to form a base mixture, the solution comprising a water stable conducting polymer in a liquid medium;
exposing the base mixture to an ultrasonic dispersion process at a power of greater than 1 W/cm2 and at a frequency of 20-50 kHz;
introducing a metal oxide sol solution to the base mixture to form a field emission material precursor;
exposing the field emission material precursor to an ultrasonic dispersion process at a power of less than 1 W/cm2 and at a frequency of greater than 50 kHz to form a stable solution of the field emission material precursor;
introducing a polar additive into the stable solution of the field emission material precursor to form a final sol solution as a final field emission material precursor;
depositing a layer of the final field emission material precursor on at least a portion of a substrate;
drying the layer of the final field emission material precursor and the substrate at a temperature of 30° C. to 150° C. at atmosphere or under a vacuum such that the layer of the final field emission material precursor forms a uniform gel layer on the substrate;
annealing the gel layer and the substrate at a temperature of 500° C. to 1000° C. under a vacuum such that the gel layer forms a field emission material; and
activating the field emission material to form the field emission cathode.