Graphene Transfer via Hot Press and Thermal-Releasable Sheet
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Solution Overview
Problem
Current methods for transferring large-area graphene are inefficient and costly, and conventional roll-to-roll processes often damage graphene when applied to rigid substrates due to pressure and friction.
Innovation Solution
A method using a hot press with a thermal-releasable sheet to attach and separate graphene from a substrate, allowing for pressurization and heating to transfer graphene efficiently onto both flexible and rigid substrates, minimizing damage through controlled temperature and pressure settings and vacuum lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If roll-to-roll process is used to transfer graphene, then transfer speed and productivity are improved, but rigid substrates cannot resist pressure and friction resulting in damage to graphene
Solution Approach 1:
The patent replaces the mechanical roll-to-roll transfer system with a hot press system that uses controlled thermal and pressure conditions. Instead of continuous mechanical rolling that causes friction and damage, the invention uses a hot press to apply uniform pressure and heat to transfer graphene, substituting mechanical friction-based transfer with thermally-assisted pressure transfer that preserves graphene integrity while maintaining efficiency.
Solution Approach 2:
The invention changes the transfer parameters by controlling temperature and pressure independently through upper and lower presses with separate heating systems. By optimizing these parameters, the process achieves high transfer efficiency without the mechanical damage caused by conventional roll-to-roll methods, allowing rigid substrates to withstand the transfer process.
2Device complexity
If conventional transfer methods are used, then process simplicity is maintained, but time efficiency is poor and cost is high for mass production
Solution Approach 1:
The hot press system is divided into independent upper and lower presses, each with separate heating and control systems. This segmentation allows simultaneous control of temperature and pressure parameters, enabling optimized transfer conditions that improve mass production efficiency while maintaining process clarity and simplicity.
Solution Approach 2:
The hot press system serves multiple functions: it applies pressure for transfer, provides controlled heating, and can process multiple substrates simultaneously. This multi-functionality enables the system to achieve mass production efficiency while keeping the overall process relatively simple and versatile for different substrate types.
3Manufacturing precision
If high pressure is applied during transfer, then transfer completeness is improved, but friction causes damage to graphene on rigid substrates
Solution Approach 1:
The invention replaces friction-based mechanical pressure transfer with thermally-assisted pressure transfer. The hot press applies pressure through controlled heating that softens the adhesive layer, allowing graphene to transfer completely without relying on high friction that would damage the graphene on rigid substrates.
Solution Approach 2:
The process utilizes phase transition of the adhesive layer through controlled heating. The heat causes the adhesive to transition to a softer state that facilitates complete graphene transfer under pressure, then cools to solidify and hold the transferred graphene in place, achieving complete transfer without friction damage.
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 efficient, cost-effective transfer of large-area graphene onto various substrates with reduced damage, allowing for continuous batch processing and maintaining optimal transfer conditions.
Implementation Method 1
separating the thermal-releasable sheet from the graphene and transferring the separated graphene onto the target substrate at the same time by pressurizing and heating
Implementation Method 2
providing vacuum lines on the upper/lower presses so as to fix a position of a target substrate
Data Source
AI summary
The present invention relates to a method for transferring graphene using a hot press, comprising: a step of contacting graphene, having a thermal-releasable sheet attached thereto, with a target substrate; and a step of pressing and heating the graphene having the thermal-releasable sheet attached thereto and the target substrate using the upper press and lower press of a hot press so as to separate the thermal-releasable sheet and the graphene and transfer the separated graphene to the target substrate. The present invention also relates to a graphene-transfer hot press apparatus for said transfer process.