Method for transferring graphene on metal foil substrate

Abstract

The invention discloses a method for transferring graphene on a metal foil substrate. The method is characterized by comprising the following steps of: rotatably coating a protective colloid on the surface of the graphene to form a protective colloid layer on the surface of the graphene, wherein the protective colloid is a mixed solution of a photoresist and a polymethyl methacrylate solution; placing the graphene with the protective colloid layer on the surface into a metal foil etching solution, and forming a composite layer of a graphene / protective colloid layer after the metal foil is completely etched; taking out the composite layer of the graphene / protective colloid layer, placing the composite layer into deionized water to be soaked and cleaned, then, transferring the composite layer on a target substrate, next, centrifuging the target substrate on centrifuging equipment, immersing the target substrate into an acetone solvent after the centrifuging operation is ended, and etching the protective colloid layer. The protective colloid used in the method is simple in preparation and easy to remove, so that no protective colloid is remained on the graphene; the liquid remained on the surface of the graphene and between the graphene and the target substrate after being transferred on the target substrate is effectively removed in a centrifuging way.

Description

technical field [0001] The invention relates to a transfer method of graphene. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice. Graphene has the following excellent properties: such as: high transmittance, high thermal conductivity, high electron mobility, the world's smallest resistivity, thinnest thickness, and larger specific surface area. At present, the preparation methods of graphene mainly include: mechanical exfoliation method, epitaxy method, graphite oxide reduction method, epitaxial growth method, and chemical vapor deposition method. Among them, the chemical vapor deposition method can meet the requirements of large-scale preparation of high-quality and large-area graphene. The main transfer methods of graphene grown by chemical vapor deposition (CVD method) include: 1. "Wet etching" transfer method, 2. . "roll-to-roll" transfer method, 3. "electrochemical transfer" met...

AI Technical Summary

Problems solved by technology

Now the main method is to dry or dry naturally, such as figure 1 As shown, it is easy to leave liquid stains on the substrate, which affects the use, and the liquid remaining between the graphene and the target substrate is more difficult to remove

Another important aspect is that a layer of protective glue needs to be coated on the surface of the growing graphene substrate during wet transfer. How to perfectly remove the protective glue after transferring the etched graphene to the target substrate? a big challenge

Now most of the researchers are thinking about how to remove the glue. They study various methods and solvents that can remove the glue more cleanly. However, no one has changed the composition of the glue starting from the protective glue itself. Makes it easier to remove with common glue removal solvents or common glue removal methods

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