Large monocrystal graphene and preparation method thereof

Abstract

The invention relates to a large monocrystal graphene and a preparation method thereof. The preparation method comprises the following steps: 1) in a non-reducing gas atmosphere, carrying out annealing treatment on a copper base; 2) while introducing reducing gas into a reactor, carrying out annealing reduction on the copper base subjected to annealing treatment in the step 1); and 3) depositing graphene on the surface opposite the substrate on the gap formed by the two copper bases subjected to annealing reduction by a chemical vapor deposition process, thereby obtaining the isolated large monocrystal graphene. The preparation method can also further comprise the following steps: by using polymethyl methacrylate (PMMA) or polyethylene terephthalate (PET) as a medium, transferring the large monocrystal graphene onto the target base, and adjusting the growth time and gas flow rate in the graphene growth process to quickly prepare the isolated large monocrystal graphene sample. The method does not need longer preparation time or any expensive monocrystal base.

Description

Technical field

[0001] The invention belongs to the field of graphene preparation, and specifically relates to a large single crystal graphene and a preparation method thereof. Background technique

[0002] Graphene is a honeycomb-shaped two-dimensional atomic crystal composed of a single layer of carbon atoms closely arranged. Because of its excellent optical, electrical and mechanical properties, it has received extensive attention since its discovery. However, how to apply it to practical applications, the key lies in the need for efficient preparation methods. At present, a variety of graphene preparation methods have emerged, such as mechanical exfoliation, liquid exfoliation, graphene oxide reduction, silicon carbide epitaxy, chemical vapor deposition, and segregation growth. Among them, the chemical vapor deposition method has become one of the mainstream methods for preparing graphene due to its advantages of large area, high quality, regular shape, easy transfer, contr...

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