Field Emission Cathode Microchannel Plate Carbon Nanotube Anchoring
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Solution Overview
Problem
Carbon nanotube-based field emission cathodes have a short lifespan due to carbon nanotubes being pulled out from the cathode electrode by strong electric field forces, leading to instability and reduced performance.
Innovation Solution
A field emission cathode design featuring a microchannel plate with carbon nanotubes fixed inside its holes using van der Waals attractive forces, combined with conductive or insulative materials and secondary electron layers to enhance electron emission efficiency, and a method of filling and solidifying carbon nanotube slurry within the microchannel plate structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbon nanotubes are printed on the cathode electrode, then the field emission cathode can be manufactured, but the carbon nanotubes are not secured and tend to be pulled out by strong electric field forces
Solution Approach 1:
The invention introduces a microchannel plate structure that segments the cathode into multiple isolated channels. Each channel contains and anchors carbon nanotubes individually, preventing them from being pulled out by electric field forces. This segmentation approach maintains manufacturing simplicity while significantly improving cathode stability and reliability.
2Reliability
If carbon nanotubes are secured firmly on the cathode electrode, then cathode stability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The microchannel plate acts as an intermediary structure between the cathode electrode and the carbon nanotubes. It provides physical confinement and anchoring points for the nanotubes without requiring complex bonding processes. This intermediary approach achieves firm securing of carbon nanotubes while maintaining relatively simple manufacturing procedures.
3Ease of manufacture
If carbon nanotubes are held loosely on the cathode electrode, then manufacturing is simpler, but the cathode has short life due to nanotube pull-out
Solution Approach 1:
By segmenting the cathode into microchannel structures, each channel independently anchors carbon nanotubes, preventing pull-out during operation. This segmentation maintains ease of manufacture through simple slurry filling while dramatically extending cathode life by securing nanotubes against electric field forces throughout the device lifetime.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves the stability and electron emission efficiency of field emission cathodes by securely anchoring carbon nanotubes within the microchannel plate, reducing the impact of electric field forces and enhancing secondary electron generation, resulting in prolonged cathode life and consistent performance.
Implementation Method 1
carbon nanotubes fixed inside its holes using van der Waals attractive forces
Implementation Method 2
Field emission cathode is important element in FED. A field emission cathode based on carbon nanotubes
Implementation Method 3
combined with conductive or insulative materials and secondary electron layers to enhance electron emission efficiency, and a method of filling and solidifying carbon nanotube slurry within the microchannel plate structure
Data Source
AI summary
The disclosure relates to a method for making field emission cathode. A microchannel plate is provided. The microchannel plate includes a first surface and a second surface opposite to the first surface. The microchannel plate defines a number of holes extending through the microchannel plate from the first surface to the second surface. The plurality of holes are filled with a carbon nanotube slurry. The carbon nanotube slurry is adhered on inner walls of the plurality of holes. The carbon nanotube slurry in the plurality of holes is solidified.