Lead: The society is constantly developing, and the pace of science and technology has never stopped. Everything in the world we live in is developing in a faster and more convenient direction. Scientists make different materials through some physical reactions or chemical synthesis to build thinner and faster products. Graphene is widely used in the manufacture of electronic products, and its preparation methods are also varied. This paper introduces its physical preparation methods and chemical preparation methods for you.

1. Preparation of Graphene by Physical Method

Physical methods usually use cheap graphite or expanded graphite as raw materials to prepare single-layer or multi-layer graphene by mechanical stripping method, oriented epiphytic method and direct stripping method in liquid or gas phase. The raw materials of these methods are easily available. The operation is relatively simple, and the synthesized graphene has high purity and few defects.

oriented epiphytic method-crystal film growth

Peter? W.Sutter and others used rare metal ruthenium as the growth substrate, and "planted" graphene by using the atomic structure of the substrate. Firstly, C atoms were infiltrated into ruthenium at 115°C, and then cooled to 85 C. A large number of carbon atoms absorbed before would float to the surface of ruthenium, forming a lens-shaped single-layer carbon atom "island" on the whole substrate surface. The "island" gradually grew up and eventually grew into a complete layer of graphene. The coverage rate of the first floor is 8? %, the second layer began to grow, and there was a strong interaction between the graphene at the bottom and the matrix. After the second layer was formed, the previous layer was almost completely separated from the matrix, leaving only weak coupling, thus making a single-layer graphene sheet. However, the thickness of graphene sheets produced by this method is often uneven, and the adhesion between graphene and matrix will affect the characteristics of graphene sheets.

II. Preparation of Graphene by Chemical Method

At present, graphene used in the laboratory is mainly prepared by chemical method. In this method, benzene ring or other aromatic systems were used as the core at first, and six C's on benzene ring or macroaromatic ring were replaced by multi-step coupling reaction, and the aromatic system was enlarged, so that graphene with a certain size was obtained. On this basis, people continue to improve it, making graphite oxide reduction method the most potential and promising method to synthesize graphene and its materials. In addition, chemical vapor deposition and crystal epitaxial growth can also be used to prepare high-purity graphene on a large scale.

Many products we use are made of synthetic materials, and these synthetic materials are made by scientists through physical preparation or chemical preparation, which are used in life and provide convenience for people's lives. Graphene is extracted from graphite, and its preparation methods are various. This paper introduces the physical preparation methods and chemical preparation methods of graphene for you, hoping you can know more about the preparation methods of this material.

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