Graphene film and transfer method thereof

Abstract

The invention discloses a graphene film transfer method which comprises the following steps: forming an auxiliary transfer layer on the surface of a graphene film directly growing on a metal substrate to obtain an auxiliary transfer layer / graphene film / metal substrate complex; removing the metal substrate to obtain an auxiliary transfer layer / graphene film complex; the side face of the graphene film of the auxiliary transfer layer / graphene film composite body is attached to a target substrate; and removing the auxiliary transfer layer with an organic solvent; wherein the auxiliary transfer layer is a poly (propylene carbonate) layer or a poly (epsilon-caprolactone) layer. According to the method, the graphene film is transferred by utilizing the polypropylene carbonate layer or the poly epsilon-caprolactone layer, and PPC or PCL has weak interaction with the graphene surface and is easily dissolved in various organic solvents, so that the PPC or PCL can be easily removed from the film surface without leaving residues, and the cleanliness of the film surface can be improved. Meanwhile, the multi-fold graphene film can be obtained through transfer, and the fold density can reach 50-60 pieces per 100 mu m < 2 >.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a graphene film and a transfer method thereof. Background technique [0002] Graphene is a promising material, especially in next-generation flexible thin-film electronic and optoelectronic devices, such as touchscreens, solar cells, organic light-emitting diodes, sensors, and other fields. However, unlike flat graphene, wrinkled graphene overcomes the unique property of flat graphene's inherent ductility, enhancing the surface area and porosity, which can improve the tensile properties of the material. Taking advantage of these superior properties, wrinkled graphene plays an important role in stretchable flexible devices and nanofluidic devices, greatly enriching the application fields of 2D materials. At present, chemical vapor deposition (CVD)-grown graphene films can be prepared with controllable layers, domains, and morphology. But in order to apply graphene to ...

AI Technical Summary

Problems solved by technology

The graphene transferred by these methods has problems such as low integrity and poor cleanliness, which seriously restrict the excellent performance of graphene films.

Polymer-assisted transfer can transfer graphene to the target metal substrate relatively completely, but polymers such as polymethyl methacrylate (PMMA) have a strong interaction with graphene and are not easy to dissolve in solvents, and the surface of graphene still remains A large number of residues, greatly increasing the surface roughness of graphene

Moreover, the wrinkle density of graphene films formed by traditional transfer methods cannot meet the requirements of flexible devices.

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