Carbon Nanotube Polymer Composite Cathode Manufacturing
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Solution Overview
Problem
Existing methods for manufacturing field emission cathodes with carbon nanotube arrays are complex, unsuitable for mass production, and lack the toughness and pliability needed for flexible display devices.
Innovation Solution
A method involving a carbon nanotube array on a substrate, coated with a prepolymer of polymethyl methacrylate (PMMA) that is settled, rotated to form a film, polymerized, and then separated from the substrate to be attached to an electrode, creating a carbon nanotube/polymer composite with improved toughness and conductive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a typical method for manufacturing insulative layer is used, then electromagnetic shielding among carbon nanotubes can be avoided, but the manufacturing process becomes complex and unsuitable for mass production
Solution Approach 1:
The patent combines the insulative layer formation with the carbon nanotube array structure by using the polymer matrix as both structural support and insulating medium. The carbon nanotube array is embedded within the polymer insulative layer, merging two separate manufacturing steps into an integrated structure that avoids electromagnetic shielding while simplifying the manufacturing process.
Solution Approach 2:
The patent creates a composite material structure where carbon nanotubes are embedded in a polymer matrix (polymethyl methacrylate). This composite provides both the electrical insulation needed to prevent electromagnetic shielding and a simplified manufacturing process, as the polymer matrix serves dual purposes of structural support and electrical insulation.
2Reliability
If traditional field emission cathode structure is used, then field emission function is achieved, but toughness and pliability are poor and not fit for flexible display devices
Solution Approach 1:
The patent uses a composite material structure where carbon nanotubes (providing field emission function) are embedded in a polymer matrix (providing toughness and pliability). The polymer matrix, specifically polymethyl methacrylate, gives the cathode flexible mechanical properties suitable for flexible display devices while maintaining the electrical field emission capability of the carbon nanotubes.
Solution Approach 2:
The patent employs a polymer film structure that inherently provides flexibility and pliability. The thin film nature of the polymer matrix allows the field emission cathode to be bent and flexed without damage, making it suitable for flexible display applications while maintaining functional integrity.
3Object-affected harmful factors
If complex manufacturing method is used to achieve insulative layer, then electromagnetic shielding is avoided, but ease of manufacture decreases
Solution Approach 1:
The patent merges the insulative layer formation with the carbon nanotube array structure by embedding the nanotubes within the polymer matrix. This eliminates the need for separate insulative layer deposition steps, simplifying the manufacturing process and improving ease of manufacture while still preventing electromagnetic shielding.
Solution Approach 2:
The polymer matrix serves multiple functions simultaneously: it provides structural support, electrical insulation to prevent electromagnetic shielding, and mechanical flexibility. This multi-functionality reduces the need for additional manufacturing steps and materials, improving ease of manufacture.
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 resulting field emission cathode is flexible, resistant to electromagnetic shielding, and suitable for mass production, with enhanced toughness and double-faced conductive performance, making it suitable for flexible display devices.
Implementation Method 1
putting the prepolymer into the container and permitting the prepolymer to settle for a period of over 30 minutes to fill in clearances of the carbon nanotube array
Implementation Method 2
securing the container onto a rotator and rotating the rotator at a speed of about 200 r/min to 600 r/min, thereby removing the part of the prepolymer covered on a top end of the carbon nanotube array
Implementation Method 3
polymerizing the prepolymer film by first heating the prepolymer film at a temperature of about 50° C. to 60° C. for a period of about 1 hour to 4 hours and then heating the prepolymer film to about 90° C. to 100° C. to form a polymer film
Implementation Method 4
immerging the polymer film into water for a period of over 5 minutes to separate the polymer film from the substrate
Data Source
AI summary
A method for manufacturing a carbon nanotube/polymer composite includes the steps of: (a) providing a carbon nanotube array formed on a substrate in a container; (b) providing a prepolymer of polymethyl methacrylate (PMMA); (c) putting the prepolymer into the container for a period of over 30 minutes to fill in clearances of the carbon nanotube array; and (d) polymerizing the prepolymer film at a temperature of about 50° C. to 60° C. for a period of about 1 hour to 4 hours and then heating the prepolymer film to about 90° C. to 100° C. to form a polymer film, the carbon nanotube array thereby being embedded within the polymer film.