Volatile Binding Agent for Residue-Free Graphene Film Transfer
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Solution Overview
Problem
Current graphene transfer methods are costly, difficult to operate, prone to damage, and result in residual glue affecting light transmittance and electrical conductivity, unsuitable for large-area or multi-layer transfers.
Innovation Solution
A two-component volatile organic solvent binding agent, insoluble or slightly soluble in water, is used to form a liquid film between the graphene and target substrate, ensuring non-destructive transfer and complete volatilization post-etching, maintaining graphene integrity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional transition substrate methods are used for graphene transfer, then the transfer process can be completed, but the cost increases and the operation becomes difficult
Solution Approach 1:
The patent extracts and eliminates the transition substrate from the transfer process, using only a binding agent instead. This removes the complex multi-step process involving transition substrate attachment, graphene transfer, and transition substrate removal, simplifying the overall procedure while maintaining transfer effectiveness.
Solution Approach 2:
The patent introduces a binding agent as a simplified intermediary between the graphene and target substrate. This binding agent performs the essential function of enabling transfer without requiring the complex transition substrate system, making the process easier to operate while still achieving the transfer objective.
2Ease of manufacture
If multiple transfer processes are used to achieve graphene transfer, then the transfer can be completed, but the graphene integrity deteriorates
Solution Approach 1:
The patent removes the intermediate transition substrate step that causes repeated handling and potential damage. By going directly from graphene to target substrate using only a binding agent, the number of transfer processes is reduced, minimizing opportunities for damage while still achieving complete transfer.
3Ease of manufacture
If conventional binding agents are used for graphene transfer, then the transfer can be achieved, but the light transmittance and electrical conductivity deteriorate
Solution Approach 1:
The patent changes the key parameter of the binding agent by selecting materials with appropriate volatility characteristics. The binding agent is chosen to be volatile at processing temperatures, allowing it to evaporate completely after transfer, leaving no residue that would affect light transmittance or electrical conductivity, while still providing sufficient adhesion during the transfer process.
4Ease of manufacture
If conventional binding agents are used for multi-layer graphene transfer, then the transfer process can be performed, but the transfer quality deteriorates due to binding agent residue
Solution Approach 1:
The patent changes the volatility parameter of the binding agent to enable complete evaporation. This allows multi-layer graphene transfer to be performed with high quality, as each layer can be transferred and the binding agent can fully evaporate without leaving residues that would compromise the quality of subsequent layers or the overall structure.
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
Enables low-cost, high-quality graphene transfer with high light transmittance and reduced sheet resistance, suitable for large-scale production and multi-layer applications.
Implementation Method 1
Because of the capillary force, the liquid film is able to attach the metal substrate/graphene and the target substrate together
Implementation Method 2
the binding agent is volatile. After the metal substrate is etched, due to the volatility of the binding agent, the graphene can be firmly attached to the target substrate
Data Source
AI summary
The present disclosure provides a binding agent for graphene film transfer, comprising 5-95 parts by weight of a volatile organic solvent A and 95-5 parts by weight of a volatile organic solvent B. The present disclosure does not use a transition substrate, which greatly reduces the cost, and realizes low-cost transfer. Moreover, the binding agent can be completely volatilized, so that the transferred graphene has no residual glue. The graphene is pure and pollution-free, and a high-quality graphene film can be obtained after the transfer of the graphene. Furthermore, high-quality multi-layer transfer can be achieved and the quality of multi-layer graphene can be guaranteed. Moreover, the graphene can be transferred to any different target substrates. The transfer method provided by the present disclosure has simple operation, good controllability and high repeatability, which can not only realize single-piece transfer, but also can realize roll-to-roll large-area transfer, and can maintain the high quality of graphene after the transfer, so that it is especially suitable for promotion and application of large-scale preparation and production.