Graphene-Copper Composite Electron-Path Tunnels
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Solution Overview
Problem
Current methods for improving the electrical conductivity of copper have only achieved a limited 3% increase over the past 100 years, despite extensive research, and the theoretical benefits of graphene in enhancing conductivity have not been experimentally verified for bulk metal composites.
Innovation Solution
A composite structure is developed with copper layers sandwiched between graphene layers, which form electron-path tunnels, enhancing electrical conductivity by promoting grain re-orientation and crystallinity, and providing electron doping effects, resulting in a multilayer composite with electrical conductivity up to 116% of the International Annealed Copper Standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to improve copper electrical conductivity through purity refinement, then conductivity increases slightly, but the improvement is limited to only about 3% despite extensive research over 100 years
Solution Approach 1:
The patent applies composite materials by combining copper with graphene to create a Cu-Gr-Cu multilayer composite structure. This composite approach enables electrical conductivity enhancement of up to 116% IACS, dramatically exceeding the limited 3% improvement achieved through traditional purity refinement methods alone.
2Reliability
If graphene layers are deposited on copper substrates, then electrical conductivity is enhanced through electron doping and grain re-orientation, but the manufacturing process complexity increases
Solution Approach 1:
The patent segments the copper conductor into a multilayer Cu-Gr-Cu composite structure with alternating copper and graphene layers. This segmentation allows the graphene layers to be strategically positioned at interfaces where they can maximize electron doping effects and grain re-orientation, thereby enhancing conductivity while maintaining a relatively manageable manufacturing process through sequential deposition.
Solution Approach 2:
The graphene layers serve as intermediary elements between copper substrates, mediating electron transport through doping effects and facilitating grain re-orientation at interfaces. This intermediary role of graphene enables significant conductivity enhancement (up to 116% IACS) while the deposition process, though added, follows established thin-film fabrication 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 graphene-copper composite achieves a significant enhancement in electrical conductivity, with interface conductivity three orders of magnitude higher than pure copper and bulk conductivity up to 16% higher, demonstrating potential for improved electrical and thermal applications.
Implementation Method 1
providing electron doping effects
Implementation Method 2
form electron-path tunnels, enhancing electrical conductivity
Implementation Method 3
The as-obtained foils were then hot-pressed into 150-μm thick sheets
Data Source
AI summary
A composite structure comprises a copper layer and first and second graphene layers sandwiching the copper layer, wherein the composite structure provides electron-path tunnels between the copper layer and the first and second graphene layers. The electron-path tunnels may enhance the electrical conductivity. A multilayer composite structure comprises a first copper layer, a first graphene layer on the first copper layer, a second graphene layer on the first graphene layer, and a second copper layer on the second graphene layer.