Vertically Aligned Graphene Film for Thermal Management
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Solution Overview
Problem
Existing thermal interface materials (TIMs) have limited thermal conductivity in the vertical direction, making it difficult to efficiently manage heat dissipation in modern electronics, and high graphene content is impractical for fabrication.
Innovation Solution
A method for manufacturing a vertically aligned laminated graphene based thermally conductive film by alternating layers of graphene and nanoparticles, with an adhesive in between, and cutting the laminate at an angle to achieve tilted graphene layers for enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high graphene content is used to increase thermal conductivity, then thermal performance is improved, but fabrication becomes impractical
Solution Approach 1:
The patent creates a composite structure combining graphene films with nanoparticle layers and adhesive materials. This composite approach achieves high thermal conductivity through the vertically aligned graphene layers while maintaining fabrication practicality by using thin individual graphene layers that can be handled and assembled using conventional manufacturing techniques.
Solution Approach 2:
Instead of using a single thick graphene layer or excessively high graphene content, the patent segments the graphene into multiple thin films that are vertically stacked. This segmentation maintains high thermal conductivity performance while making each individual layer manageable for fabrication processes.
2Temperature
If vertically aligned graphite structure is created to improve heat dissipation, then thermal conductivity is improved, but the material becomes brittle and difficult to manufacture
Solution Approach 1:
The patent combines vertically aligned graphene films with adhesive layers and nanoparticle coatings to create a composite structure. This composite approach maintains the vertical alignment needed for thermal conductivity while the adhesive and nanoparticle components provide flexibility and reduce brittleness.
Solution Approach 2:
The patent applies different materials with different properties to different parts of the structure: graphene films provide thermal conductivity, adhesive layers provide flexibility and bonding, and nanoparticle coatings enhance adhesion. This local differentiation of material properties resolves the contradiction between vertical alignment and brittleness.
3Temperature
If vertically aligned graphene structure is used to enhance thermal conductivity, then heat dissipation is improved, but adhesion strength between layers is insufficient
Solution Approach 1:
The patent introduces adhesive layers and nanoparticle intermediaries between the graphene films. These intermediary materials facilitate strong bonding between the vertically aligned graphene layers, resolving the adhesion strength issue while preserving the vertical alignment structure needed for thermal conductivity.
Solution Approach 2:
The patent creates a composite structure where adhesive materials and nanoparticle coatings are integrated with the graphene films. This composite approach ensures strong interlayer adhesion while maintaining the vertical alignment of graphene for optimal thermal conductivity.
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 film exhibits improved thermal conductivity both in the vertical and horizontal directions, increased flexibility and tensile strength, and reduced crack formation during deformation, making it suitable for efficient heat dissipation in electronic devices.
Implementation Method 1
arranging an adhesive on the first graphene film; attaching a second graphene film to the first graphene film by means of the adhesive
Implementation Method 2
arranging a layer of nanoparticles on a surface of the first graphene film, wherein the nanoparticles are configured to improve an adhesion strength between the first and second graphene films
Implementation Method 3
laminating the layered film by applying pressure and heat to cure the adhesive
Implementation Method 4
laminating the layered film by applying pressure and heat to cure the adhesive
Data Source
AI summary
Method of manufacturing a vertically aligned laminated graphene based thermally conductive film. The method comprising: attaching first and second graphene film using a layer of nanoparticles and an adhesive; forming a layered film comprising a predetermined number of graphene film layers by repeating the steps of arranging a layer of nanoparticles, arranging an adhesive and attaching a graphene film; and laminating the layered film by applying pressure and heat to cure the adhesive, thereby forming a laminate film; cutting the laminate film at an angle in relation to a surface plane of the film to form the vertically aligned laminated graphene based thermally conductive film.