Graphene Composite Structure via CVD and Etching
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Solution Overview
Problem
Graphene composite films exhibit lower conductivity, ductility, and light transmittance due to disorderly distributed graphene fragments within a polymer matrix, lacking the excellent electrical and thermal properties of complete graphene layers.
Innovation Solution
A method involving chemical vapor deposition (CVD) to grow a graphene film on a metal substrate, followed by partial removal of the substrate to form a graphene composite structure with stripped electrodes, enhancing conductivity and ductility while maintaining high transmittance, or combining graphene with a polymer layer using a hot-pressing method to create a freestanding composite film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If graphene is dispersed in a polymer matrix to form composite film, then the composite structure is formed, but the conductivity and ductility are much lower than complete graphene layer
Solution Approach 1:
The patent combines graphene with polymer materials to form composite structures, leveraging the advantages of both materials. The graphene provides excellent electrical conductivity and mechanical strength, while the polymer matrix provides flexibility and processability, resolving the contradiction between maintaining graphene's intrinsic properties and achieving practical composite film performance.
Solution Approach 2:
The patent uses techniques to divide the graphene into controlled fragments or patterns rather than complete layers, allowing the composite to maintain adequate conductivity while achieving the desired film structure and optical properties through strategic segmentation of the graphene material.
2Strength
If graphene fragments are dispersed in polymer matrix, then composite film is formed, but light transmittance is relatively low
Solution Approach 1:
The patent creates regions with different graphene concentrations and distributions within the polymer matrix. By controlling the local density and arrangement of graphene fragments, the composite achieves adequate structural integrity in certain regions while maintaining high light transmittance in other regions, resolving the contradiction between strength and optical transparency.
3Reliability
If complete graphene layer is used, then excellent electrical and thermal properties are achieved, but the composite film structure and processing capability are reduced
Solution Approach 1:
The patent modifies key parameters including graphene fragment size, shape, concentration, and distribution within the polymer matrix. By optimizing these parameters, the composite film maintains excellent electrical and thermal properties while achieving improved processability, flexibility, and suitability for various manufacturing techniques.
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 method achieves improved conductivity, ductility, and light transmittance in graphene composite structures, leveraging the properties of graphene while maintaining structural integrity and optical transparency.
Implementation Method 1
growing a graphene film on the first surface of the metal substrate by a chemical vapor deposition (CVD) method
Implementation Method 2
combining graphene with a polymer layer using a hot-pressing method to create a freestanding composite film
Data Source
AI summary
A method for making a graphene composite structure includes providing a metal substrate including a first surface and a second surface opposite to the first surface, growing a graphene film on the first surface of the metal substrate by a CVD method, providing a polymer layer on the graphene film and combining the polymer layer with the graphene film, and forming a plurality of stripped electrodes by etching the metal substrate from the second surface.