Carbon Nanotube Field Emission Wire with Protective Coating
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Solution Overview
Problem
Existing field emission elements using carbon nanotubes face issues with poor mechanical and electrical connections between the carbon nanotubes and the conductive cathode electrode, leading to unsatisfactory field emission characteristics, high production costs, and low controllability in the in-situ synthesis method, while mechanical methods lack precision and efficiency.
Innovation Solution
A field emission element featuring a carbon nanotube field emission wire coated with a supporting protective layer, such as a CNT-polymer or CNT-glass composite, which enhances both mechanical and electrical connections, allowing for improved field emission performance and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical methods are used to form carbon nanotubes on conductive cathode electrodes, then the method is relatively easy and straightforward, but the precision and efficiency are relatively low and the electrical connection is poor
Solution Approach 1:
The patent introduces a supporting protective layer as an intermediary between the carbon nanotube and the conductive cathode electrode. This layer serves as a mediator that simultaneously provides mechanical support, protects the carbon nanotube from damage, and ensures good electrical connection, thereby resolving the contradiction between ease of manufacture and manufacturing precision.
2Reliability
If in-situ synthesis methods are used to form carbon nanotubes on conductive cathode electrodes, then the electrical connection is typically good, but the mechanical connection is relatively weak and unreliable
Solution Approach 1:
The patent employs a composite structure consisting of the carbon nanotube, the supporting protective layer, and the conductive cathode electrode. This composite material approach allows combining the electrical conductivity of the carbon nanotube with the mechanical strength and protective properties of the supporting layer, thereby achieving both good electrical connection and strong mechanical connection.
3Ease of manufacture
If in-situ synthesis methods are used to form carbon nanotubes on conductive cathode electrodes, then the method is relatively easy, but the production efficiency is relatively low and the controllability is less than desired
Solution Approach 1:
The patent applies preliminary action by pre-coating the conductive cathode electrode with a supporting protective layer before synthesizing the carbon nanotubes. This preliminary preparation enables better control over the carbon nanotube growth process, improves production efficiency, and enhances the overall manufacturability of the field emission element.
4Ease of manufacture
If in-situ synthesis methods are used to form carbon nanotubes on conductive cathode electrodes, then the method is relatively easy, but the cost is relatively high
Solution Approach 1:
The patent utilizes parameter changes by optimizing the coating parameters and synthesis conditions of the supporting protective layer. By adjusting parameters such as coating thickness, material composition, and synthesis temperature, the patent achieves cost-effective production while maintaining high manufacturing ease and performance.
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 solution provides a robust and efficient field emission element with enhanced mechanical stability and electrical connectivity, improving electron emission performance and reducing production costs while increasing controllability and production efficiency.
Implementation Method 1
The carbon nanotube acts as an emitter of the field emission element
Data Source
AI summary
A given field emission element includes a carbon nanotube field emission wire and at least one supporting protective layer coating an outer surface of the carbon nanotube field emission wire. The carbon nanotube field emission wire is selected from a group consisting of a carbon nanotube yarn, a wire-shaped CNT-polymer composite, and a wire-shaped CNT-glass composite. A method for manufacturing the described field emission element includes the steps of: (a) providing one carbon nanotube field emission wire; (b) forming one supporting protective layer on an outer surface of the carbon nanotube field emission wire; and (c) cutting the carbon nanotube field emission wire to a predetermined length and treating the carbon nanotube emission wire to form the field emission element.