Automated Graphene Transfer via Liquid Flow Dynamics
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Solution Overview
Problem
Current graphene transfer methods are manual, leading to low production yields, reliability issues, and limited scalability, particularly for large area monolayer graphene films, and often result in damage to the graphene layer due to chemical modification or unsuitable substrate compatibility.
Innovation Solution
An automated equipment and method for transferring graphene monolayers, protected with a polymer layer, using a controlled process involving etching, neutralizing, and acidic solutions, with computer-controlled valves and sensors to ensure precise handling and deposition onto various substrates, including flexible and rigid materials, enabling efficient and high-quality transfer of graphene monolayers up to wafer scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual transfer methods are used, then flexibility in handling small samples is maintained, but production yield and reliability deteriorate due to operator errors and difficulty in manipulating atomically thin films
Solution Approach 1:
The system uses automated liquid handling where the liquid flow automatically carries the graphene film from the source substrate to the target substrate without manual intervention. The equipment serves itself by using the liquid medium to perform the transfer action, eliminating operator errors while maintaining simplicity through the natural flow dynamics of the liquid
Solution Approach 2:
The patent replaces manual mechanical manipulation with an automated liquid-based transport system. Instead of physically handling the fragile graphene film with tools or hands, the system uses liquid flow to carry the film, substituting mechanical manipulation with fluid dynamics control
2Ease of operation
If chemical modification of the receiving substrate is used for direct transfer, then transfer capability is improved, but graphene properties deteriorate due to homogeneous chemical modification difficulties and negative impact on final graphene properties
Solution Approach 1:
The patent introduces a liquid medium as an intermediary carrier that temporarily holds and transports the graphene film. This liquid intermediary enables transfer without direct chemical modification of the target substrate, preserving graphene properties while achieving transfer capability through the mediating liquid phase
Solution Approach 2:
The system changes the physical state and flow parameters of the liquid medium to control the transfer process. By adjusting liquid flow rate, volume, and dynamics, the system achieves reliable transfer without chemical modification, maintaining graphene integrity through physical rather than chemical interaction
3Adaptability or versatility
If wet transfer methods are used, then transfer capability for various substrates is improved, but graphene integrity deteriorates due to damage from being atomically thin during manual manipulation
Solution Approach 1:
The liquid flow system automatically performs the transfer without manual manipulation steps. The graphene film is carried by the liquid from source to target in a continuous flow, eliminating the need for picking, placing, or handling that would damage the atomically thin structure
Solution Approach 2:
The patent uses a liquid film or flow as a flexible carrier medium that can adapt to different substrate geometries while providing continuous support to the graphene layer. This liquid film approach maintains graphene integrity by keeping it suspended and supported throughout the transfer process
4Device complexity
If manual manipulation methods are used, then equipment simplicity is maintained, but production yield deteriorates due to operator related errors and difficulty in manipulating one atom thick films
Solution Approach 1:
The system achieves automation through self-service liquid handling where the liquid flow automatically performs transfer, positioning, and deposition functions. This self-service approach increases production yield by eliminating operator errors while keeping equipment relatively simple through the use of basic liquid handling components
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 method and equipment significantly increase production yield and reproducibility, maintain graphene integrity, and allow for rapid transfer times, achieving high-quality graphene deposition on large substrates while minimizing damage and impurities, and enabling the augmentation of graphene layers for improved conductivity.
Implementation Method 1
etching the metal layer (2) by pouring a metal etching solution into an equipment according to claim 1
Implementation Method 2
a stirring element (11) to homogenise the liquid mixture
Implementation Method 3
at least one sensor (6) to control the level and pH of the liquids
Data Source
AI summary
Equipment to automatically transfer a graphene monolayer deposited on a metal layer and protected with a polymer layer to a substrate, comprising at least one liquid inlet, at least one sensor to control the level and pH of the liquids, at least one liquid outlet to drain the liquids, a stirring element to homogenise the liquid mixture and a ramp to feed in the substrate and method to automatically transfer a graphene monolayer to a substrate, which uses said equipment.