Graphene Ink Composition for Low Sheet Resistance
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Solution Overview
Problem
Current graphene production methods face challenges in achieving high-quality, large-area graphene with low sheet resistance and improved vertical thermal conductivity, making it difficult for graphene to be effectively applied in practical industrial products.
Innovation Solution
A graphene ink composition is developed, comprising charged chemically modified graphene, graphene flakes, a binder, and a solvent, where the charged chemically modified graphene has an absolute zeta potential of 25 mV or more, enhancing dispersibility and reducing sheet resistance while improving vertical thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If CVD method is used to produce large area graphene, then graphene quality and area are improved, but mass production difficulty increases
Solution Approach 1:
The patent uses chemically modified graphene flakes as a copy or alternative to CVD graphene, achieving similar electrical and thermal properties through chemical modification rather than direct CVD growth. This allows mass production via chemical processing while maintaining high performance.
Solution Approach 2:
The patent changes the production parameters from high-temperature CVD processes to chemical modification processes operating at lower temperatures. By modifying graphene flakes through chemical treatment and controlling oxidation levels, the patent achieves mass production capability while maintaining graphene quality.
2Productivity
If graphene flake mass production is implemented, then production cost decreases, but performance deteriorates
Solution Approach 1:
The patent changes key parameters including oxidation level control (keeping oxygen content below 10 atomic%), chemical modification treatments, and stacking configuration to maintain high performance while enabling mass production through chemical processing of graphene flakes.
Solution Approach 2:
The patent creates a composite structure by stacking multiple graphene flakes with controlled oxidation levels and chemical modifications. This composite approach maintains high electrical and thermal conductivity while enabling mass production through chemical processing methods.
3Ease of manufacture
If conventional graphene ink is used, then manufacturing is simple, but dispersibility is poor
Solution Approach 1:
The patent changes the chemical parameters of graphene by controlling oxidation levels and applying chemical modifications that introduce functional groups. This improves dispersibility in solvents while maintaining electrical conductivity, resolving the contradiction between simple manufacturing and poor dispersibility.
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 ink composition achieves excellent dispersibility, significantly reduces sheet resistance, and enhances vertical thermal conductivity, making it suitable for practical industrial applications.
Implementation Method 1
an absolute value of zeta potential of the charged chemically modified graphene is 25 mV or more
Data Source
AI summary
The present invention relates to a graphene ink composition including charged chemically modified graphene, a graphene flake, a binder and a solvent, wherein an absolute value of the zeta potential of the charged chemically modified graphene is 25 mV or more.