Few-Layer Graphene Ink Formulation With Tunable Atomic Defects
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Solution Overview
Problem
Existing methods struggle to produce graphene inks with controlled thickness and structural quality for large-scale, scalable electronic device fabrication due to inter-atomic layer resistance and inhomogeneity in flake size and distribution.
Innovation Solution
A method involving the exfoliation of graphite powder with an exfoliating agent in a liquid dispersant, followed by energy addition to form few-layered graphene particles, which are then encapsulated and separated to create a stable graphene ink suitable for printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce graphene inks, then large-scale production is achieved, but control over thickness and structural quality deteriorates
Solution Approach 1:
The invention segments the graphene structure into few-layered graphene particles with controlled layer numbers (2-20 layers). By controlling the exfoliation process to produce discrete few-layered particles rather than bulk graphene, the method achieves both scalable production and precise thickness control, resolving the contradiction between large-scale production and thickness control
Solution Approach 2:
The invention changes the structural parameter of graphene from bulk multi-layer to few-layered particles with specific layer counts (2-20 layers). This parameter change enables control over inter-atomic layer resistance and structural quality while maintaining scalability through controlled exfoliation processes, addressing both productivity and manufacturing precision requirements
2Productivity
If graphene production is scaled up, then productivity increases, but inter-atomic layer resistance increases
Solution Approach 1:
The invention segments graphene into few-layered particles (2-20 layers) rather than producing bulk graphene. This segmentation reduces the number of atomic layers and inter-layer interfaces, thereby reducing inter-atomic layer resistance and improving electrical conductivity while maintaining scalable production through controlled exfoliation
Solution Approach 2:
The invention changes the layer number parameter to few-layered (2-20 layers), which optimizes the balance between production scale and electrical conductivity. This parameter change reduces inter-atomic layer resistance compared to bulk graphene while enabling large-scale production through scalable exfoliation methods
3Ease of manufacture
If conventional exfoliation methods are used, then graphene production is achieved, but inhomogeneity in flake size and distribution increases
Solution Approach 1:
The invention segments graphite into few-layered graphene particles with controlled size and layer number. By using controlled exfoliation to produce discrete particles rather than random flakes, the method achieves both ease of manufacture and uniformity in flake size and distribution
Solution Approach 2:
The invention changes the product form from random flake sizes to controlled few-layered particles with specific size ranges and layer counts (2-20 layers). This parameter change enables uniform flake size and distribution while maintaining ease of manufacture through scalable exfoliation processes
Data Source
AI summary
Electrically conductive graphene inks and processes for exfoliating graphite to form few-layered graphene, especially graphene with average thickness of (20) atomic layers or less, or in some embodiments (10) atomic layers or less, that can be used in manufacture of graphene inks are provided. The few-layered graphene ink can be used to fabricate electronic and electrochemical devices, such as sensors.