Graphene preparation method

Abstract

The invention belongs to the technical field of graphene and particularly relates to a graphene preparation method. The graphene preparation method mainly includes the steps of firstly, preparing quasi-graphite oxide from quasi-graphite substances for standby use; secondly, enabling the quasi-graphite oxide prepared by the first step to enter from an A end and flow out of a B end of a pipeline, wherein the pipeline is divided into n segments from the A end to B end, equivalent pipe radiuses of the pipeline segments are R1,......,Rn in sequence, and Ri+1>Ri; temperatures in the pipeline segments are T1,......,Tn in sequence and Ti+1>Ti, and n is an integer not less than 2; thirdly, collecting materials obtained from the B end in the second step so as to obtain graphene. The graphene preparation method has the advantages that through the optimized pipeline design (suddenly enlarged pipe diameter), the quasi-graphite oxide can move more sufficiently during flowing, uniformity in heating is achieved, state consistency of cleaved instant graphite oxide is better, and accordingly a prepared graphene product is excellent in performance consistency.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a preparation method of graphene. Background technique [0002] In 2004, Andre K. Geim of the University of Manchester in the United Kingdom prepared graphene for the first time by mechanical exfoliation, which opened the prelude to the preparation and application of this material. The so-called graphene refers to a sheet-like body in which carbon atoms are arranged in a hexagonal ring, usually consisting of a single layer or multiple layers of graphite sheets, which can be infinitely extended in a two-dimensional space. Structural materials. It has outstanding advantages such as large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Specifically, its advantages include at least: high specific surface area (theoretical calculation value: 2630m 2 / g); high conductivity, carrier transport rate (200000cm 2 / V•s); high ...

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Problems solved by technology

[0004] However, when graphene is prepared by the redox method, in the reduction stage, in order to fully peel off the graphene oxide sheet and remove the oxygen-containing functional groups on the sheet, it is often necessary to apply a high-temperature, high-vacuum atmosphere during the reaction process. , at high temperature and high vacuum, the required equipment cost is high, and the production cost in the reaction process is also relatively high, so that the cost of preparing graphene by this method is relatively high, which limits the wider use of graphene

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