Graphene Release via Electrowetting Infiltration
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Solution Overview
Problem
Existing methods for removing graphene from its growth substrate are often damaging, costly, and produce waste, as they can mechanically or chemically damage the graphene and do not allow for efficient reuse of the substrate.
Innovation Solution
The method involves applying an electrical potential to a graphene-coated metal substrate in a liquid medium, utilizing electrowetting to infiltrate the liquid between the substrate and graphene, allowing for controlled release without hydrogen gas production and substrate damage, and potentially using a dielectric layer for support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dissolution processes are used to remove graphene from the growth substrate, then graphene can be released from the substrate, but the graphene becomes mechanically or chemically damaged and the process produces significant waste
Solution Approach 1:
The patent replaces chemical dissolution processes with an electrowetting-based method that uses electrical fields to manipulate liquid infiltration. By applying voltage to control liquid penetration between the graphene and substrate, the process achieves graphene release without chemical damage or substrate destruction, enabling substrate reuse
Solution Approach 2:
The patent changes the physical state and properties of the liquid medium through electrical field application. By controlling voltage parameters, the liquid's infiltration behavior is modified to enable selective penetration and graphene release while preserving both graphene integrity and substrate reusability
2Productivity
If electrolytic production of hydrogen gas is used to release graphene from the growth substrate, then graphene can be removed from the substrate, but mechanical damage occurs within the graphene due to stress from hydrogen bubble formation
Solution Approach 1:
The patent replaces electrolytic hydrogen generation with direct electrowetting control. By using electrical fields to manipulate liquid infiltration directly, the process eliminates hydrogen bubble formation and associated mechanical stress, achieving graphene release without structural damage
Solution Approach 2:
The patent introduces a controlled liquid medium as an intermediary between the electrical field and the graphene-substrate interface. This liquid mediator enables force transmission through electrowetting effects without generating harmful hydrogen gas, protecting graphene integrity during release
3Stability of the object's composition
If the graphene is firmly adhered to the growth substrate, then stable growth can be achieved, but removal and transfer of the graphene becomes difficult
Solution Approach 1:
The patent transforms the static adhesion relationship into a dynamic, controllable state. By applying electrical fields that manipulate liquid infiltration, the system can switch between strong adhesion (during growth) and controlled release (during transfer), optimizing both stability and ease of operation at different process stages
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
This process reduces mechanical and chemical damage to graphene, allows for efficient substrate reuse, and lowers energy costs by avoiding electrolytic processes, enabling the production of high-quality graphene for various applications.
Implementation Method 1
establishing an electrical potential between the metal substrate and a conductor disposed proximate to at least a portion of the dielectric layer, and releasing the graphene from the metal substrate in the presence of an infiltrated liquid medium. The electrical potential induces infiltration of the liquid medium between at least a portion of the metal substrate and the graphene.
Data Source
AI summary
It is often desirable to release graphene from its growth substrate. Present graphene release techniques can damage the graphene and produce significant quantities of hazardous waste. Electrowetting techniques can be used in alternative approaches for releasing graphene from its growth substrate. Methods for releasing graphene by electrowetting can include providing a metal substrate having graphene adhered thereto, applying a dielectric layer to the graphene to form a coated structure, placing the coated structure in a liquid medium, establishing an electrical potential between the metal substrate and a conductor disposed proximate to at least a portion of the dielectric layer such that the electrical potential induces infiltration of the liquid medium between at least a portion of the metal substrate and the graphene, and releasing the graphene from the metal substrate in the presence of the infiltrated liquid medium. The electrical potential can be maintained until the graphene is released.