Method for transferring graphene through low liquid level tension wet process

Abstract

The invention discloses a method for transferring graphene through a low liquid level tension wet process. The method comprises the following steps: washing a copper foil with the graphene and dryingby blowing; preparing a corrosion solution; adding the corrosion solution into a container, and generating a bulge on a liquid level of the corrosion solution to form a convex liquid level; dropwise adding heptane on a graphene-copper foil and completely covering the surface of the graphene with the heptane; enabling the graphene-copper foil with a heptane layer to float on the convex liquid levelof the corrosion solution, wherein the copper foil and the corrosion solution are located on the liquid level and the graphene is located on the copper foil; dropwise adding the heptane into the corrosion solution; after the copper foil is completely dissolved, horizontally an oxidization layer of a substrate above the graphene; slowly pressing the substrate to the graphene until the graphene isin sufficient contact with the substrate; attaching the graphene on the substrate to form a graphene-substrate; obtaining the graphene-substrate and washing; drying to obtain the clean graphene-substrate. According to the method disclosed by the invention, the graphene can be completely transferred and impurities are not introduced.

Description

technical field [0001] The invention belongs to the field of graphene transfer, in particular to a method for wet transfer of graphene without polymer protection. Background technique [0002] Graphene, a new type of two-dimensional thin-film carbon material, has rapidly set off a wave of graphene research in the world because of its excellent properties beyond many materials. So far, the preparation methods of graphene and the research on its mechanical, electrical, chemical and other aspects have made very good progress. However, if graphene is to be applied to other devices, it is necessary to use the CVD method to grow large-scale continuous graphene films, but the graphene grown by the CVD method cannot be used directly on the copper substrate, so a corresponding transfer method is required to transfer the graphene onto the target substrate. [0003] The traditional transfer method is also called liquid-phase corrosion method, and its specific transfer process is: 1. ...

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Problems solved by technology

[0004] The liquid phase corrosion method mainly has the following problems: serious impurities remain, and PMMA will react with the corrosion solution, causing PMMA in some areas to be difficult to be dissolved by organic solvents, resulting in incomplete removal of PMMA and more residues, which seriously affect the electronic properties of graphene. Mobility, which reduces the electrical performance of devices made of graphene

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