Methods of forming a field emission cathode
AssigneeNCX Corporation
InventorCheng Qian
Life of this patent
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Abstract
A method for fabricating a field emission cathode, the field emission cathode including a substrate having a field emission layer engaged therewith, where the field emission layer includes a plurality of purified carbon nanotubes. The carbon nanotubes are purified via a graphitization or annealing process.
Claims25
A method of forming a field emission cathode, comprising:
- depositing a field emission material on to a substrate, the field emission material comprising a plurality of purified carbon nanotubes, wherein the purified carbon nanotubes are obtained via a graphitization process, the graphitization process comprising exposing a plurality of carbon nanotubes to a temperature of at least 1500° C. under a vacuum for a predetermined length of time ranging from about 12 hours to about 72 hours to purify the plurality of carbon nanotubes.
A method of forming a field emission cathode, comprising:
- purifying a plurality of carbon nanotubes via a graphitization process, the graphitization process comprising exposing a plurality of carbon nanotubes to a temperature of at least 1500° C. under a vacuum for a predetermined length of time ranging from about 12 hours to about 72 hours to purify the plurality of carbon nanotubes, to obtain a plurality of purified carbon nanotubes;
- and
- depositing a field emission material comprising the plurality of purified carbon nanotubes on to a substrate to form the cathode.
A method of forming a field emission cathode, comprising:
- depositing a field emission material comprising a plurality of carbon nanotubes on to a substrate to form the cathode;
- and
- exposing the cathode to a graphitization process, the graphitization process comprising exposing a plurality of carbon nanotubes to a temperature of at least 1500° C. under a vacuum for a predetermined length of time ranging from about 12 hours to about 72 hours, to purify the plurality of carbon nanotubes.
A method of forming a field emission cathode, comprising:
- depositing a field emission material on to a substrate, the field emission material comprising a plurality of purified carbon nanotubes, wherein the purified carbon nanotubes are obtained via a graphitization process, the graphitization process comprising exposing the plurality of carbon nanotubes to a temperature of about 1500° C. to about 3000° C. under a vacuum of about 1×10−3 torr to about 1×10−8 torr for a length of time of about 12 hours to about 72 hours.
A method of forming a field emission cathode, comprising:
- purifying a plurality of carbon nanotubes via a graphitization process, the graphitization process comprising exposing the plurality of carbon nanotubes to a temperature of about 1500° C. to about 3000° C. under a vacuum of about 1×10−3 torr to about 1×10−8 torr for a length of time of about 12 hours to about 72 hours, to obtain a plurality of purified carbon nanotubes;
- and
- depositing a field emission material comprising the plurality of purified carbon nanotubes on to a substrate to form the cathode.
A method of forming a field emission cathode, comprising:
- depositing a field emission material comprising a plurality of carbon nanotubes on to a substrate to form the cathode;
- and
- exposing the cathode to a graphitization process, the graphitization process comprising exposing the plurality of carbon nanotubes to a temperature of about 1500° C. to about 3000°° C. under a vacuum of about 1×10−3 torr to about 1×10−8 torr for a length of time of about 12 hours to about 72 hours, to purify the plurality of carbon nanotubes.
Dependencies are inferred from the claim text.