Process for fabricating high current field emission cathode containing nanomaterials
AssigneeA&M Consulting, LLC
InventorBo Gao
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Abstract
High current field emission cathodes containing nanomaterials, and methods for their production, are provided. An exemplary method comprises forming an electrically resistive layer on a cathode substrate, forming an adhesion promoting layer on the electrically resistive layer, and forming an electron emissive layer including nanomaterials on the adhesion promoting layer. Forming each layer can include depositing a suitable mixture followed by a heating process including three firing cycles. Deposition can be performed by electrophoretic deposition or a printing technique. The layers can be patterned to form islands separated by well-defined gaps on the substrate.
Claims19
A high current field emission cathode comprising:
- a substrate;
- an electrically resistive layer disposed on the substrate, the electrically resistive layer including a mixture of a nonconductive matrix material and a conductive filler material;
- an adhesion promoting layer disposed on the electrically resistive layer;
- and
- an electron emissive layer including a nanomaterial and disposed on the adhesion promoting layer.
A method for manufacturing a high current field emission cathode comprising:
- forming an electrically resistive layer on a cathode substrate by
- forming a first mixture of a nonconductive matrix material and a conductive filler material,
- depositing the first mixture on the cathode substrate, and
- heating the deposited first mixture;
- forming an adhesion promoting layer on the electrically resistive layer by
- forming a second mixture of a nonconductive matrix material and a nanomaterial,
- depositing the second mixture on the electrically resistive layer, and
- heating the deposited second mixture;
- forming an electron emissive layer on the adhesion promoting layer by
- forming a third mixture of a nonconductive matrix material and a nanomaterial,
- depositing the third mixture on the adhesion promoting layer, and
- heating the deposited third mixture.
Dependencies are inferred from the claim text.