Graphene Transfer via Electrolysis Bubble Separation
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Solution Overview
Problem
Current graphene transfer methods are either costly and damaging to the substrate or fail to achieve damage-free transfer, especially for high-quality graphene, due to the consumption of substrates and environmental pollution in etching methods, and the risk of damage in direct transfer methods.
Innovation Solution
A method utilizing electrolysis to generate gas bubbles for non-destructive transfer of graphene from an initial substrate to a target substrate, employing a transfer medium like PMMA to protect graphene during the process, which involves coating, separation, binding, and removal steps, allowing for low-cost and pollution-free transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical etching method is used to transfer graphene, then graphene can be separated from substrate, but substrate materials are consumed and cost increases significantly
Solution Approach 1:
The patent introduces a transfer medium as an intermediary substance between the graphene and the substrate. This transfer medium enables the separation and transfer of graphene without directly consuming the substrate material, thus resolving the contradiction between achieving graphene separation and preventing substrate consumption
Solution Approach 2:
The patent replaces the chemical etching mechanism with an electrochemical approach using electrolysis-generated gas bubbles. This substitution eliminates the need for corrosive chemicals that consume substrate material, while still achieving effective graphene separation through the mechanical action of gas bubbles
2Manufacturing precision
If chemical etching method is used to transfer graphene, then graphene can be separated from substrate, but environmental pollution is caused
Solution Approach 1:
The patent replaces chemical etching with electrochemical electrolysis that generates gas bubbles. This substitution eliminates the use of corrosive chemicals and their associated environmental pollution, while maintaining effective graphene separation through the physical action of gas bubble movement and intercalation
Solution Approach 2:
The patent converts the potentially harmful effect of gas bubble formation (which could cause defects) into a beneficial separation mechanism. The gas bubbles generated by electrolysis are used constructively to push and separate graphene from the substrate, transforming what could be a harmful byproduct into the primary transfer mechanism
3Loss of substance
If direct transfer method is used to transfer graphene, then substrate materials are not consumed, but graphene is easily damaged
Solution Approach 1:
The patent introduces a transfer medium as a protective intermediary between the graphene and the external environment during the transfer process. This medium supports the graphene and prevents damage while enabling separation from the substrate without consuming substrate materials
Solution Approach 2:
The patent applies the transfer medium to the substrate before the graphene separation process. This preliminary action prepares a protective layer that will safeguard the graphene during subsequent electrolysis and transfer operations, preventing damage while maintaining substrate integrity
4Loss of substance
If electrolysis method is used to transfer graphene, then substrate can be reused and cost reduced, but process complexity is introduced
Solution Approach 1:
The patent makes the substrate serve multiple functions: as the growth substrate for graphene, as the electrode for electrolysis, and as a reusable platform for multiple transfer cycles. This multi-functionality reduces overall process complexity by eliminating the need for separate components for each function
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 damage-free and cost-effective transfer of high-quality graphene across substrates, with the ability to reuse initial substrates and reduce material loss, suitable for large-scale implementation and various substrate types, including precious metals and complex structures.
Implementation Method 1
generating gaseous substances on a surface of the initial substrate by electrolysis
Data Source
Figure 1a~1d
Figure 2a~2c
Figure 3a~3d
AI summary
A method for transferring graphene nondestructively and at a low cost. In the method, a graphene is used whose surface is coated with transferring media and whose original substrate is an electrode, the electrode is placed into an electrolyte, and the graphene is separated from the original substrate by means of the driving force of bubbles and the gas intercalation produced on the graphene electrode surface during electrolysis. Then, the graphene coated with transferring media is nondestructively combined with a target substrate. The transferring media is removed so as to transfer the graphene to the target substrate nondestructively. The transferring method results in no damage or loss with respect to the graphene and the original substrate, and the original substrate can be re-used. Furthermore, the method is easy to perform, works quickly, is easy to control, and is pollution-free.