Method for preparing graphene material based on chemical deposition

Abstract

The invention aims at providing a method for preparing a graphene material based on chemical deposition. The method comprises the following steps of: (1) uniformly mixing a soluble salt of a graphite catalyst, a polymer and an organic solvent; (2) adding a substrate in a reactor, heating the reactor to 450-1000 DEG C under the protection of inert gas; (3) introducing the mixture obtained by the step (1) into the reactor under the protection of inert gas to be subjected to chemical deposition; and (4) cooling and taking out the substrate, and removing catalyst particles by ultrasonic processing and acid pickling, thus the graphene material is obtained. In the invention, an organic solvent and a soluble polymer are adopted as the carbon sources, and a floating catalyst is used for cracking the carbon sources under the protective gas atmosphere, thus a single-layer or multi-layer graphene material is grown on the substrate, the graphene material is prepared in batch by chemical deposition, and the graphene material prepared by the method has the advantages of complete crystal form, low oxygen content and less defects.

Description

technical field [0001] The invention relates to a method for preparing nanomaterials, in particular to a method for preparing graphene in batches. Background technique [0002] Graphene material is a nano-scale graphite material composed of single-layer graphite. Due to its excellent electrical conductivity, thermal conductivity and mechanical properties, it has great potential application value in the fields of nano-devices, heat conduction, electrical conduction and energy storage. The theoretical specific surface area is as high as 2600m 2 / g, with outstanding thermal conductivity (3000W / (m K)) and mechanical properties (1060GPa), as well as high-speed electron mobility at room temperature (15000cm 2 / (V·s)). Graphene's special structure makes it have a series of properties such as perfect quantum tunneling effect, half-integer quantum Hall effect, and never-disappearing electrical conductivity, which has aroused great interest in the scientific community. However, alt...

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Problems solved by technology

However, although graphene has many of the above advantages, it has not yet achieved mass production, and the current preparation methods are limited to laboratory preparations, including mechanical exfoliation, redox and chemical vapor deposition.

For example, Geim et al. (Novoselov K S, Geim A K, Morozov S V, et al.Science, 2004, 306: 666), professors of physics at the University of Manchester, have prepared graphene using the tape stripping method, but this method cannot achieve batch production

Patent application numbers 200910070735.0; 200910054919.8; 200910184202.5 and other patent documents disclose the preparation of graphene materials from graphite oxide through chemical reduction, heat treatment or electrochemical reduction. When graphite is used, strong acid and strong oxidant will be used to cause pollution. On the other hand, the graphene material prepared by graphite oxide method has many surface defects.

In addition, the patent application No. 200810113596.0 discloses a method of using a substrate, depositing a catalyst on the substrate, and then preparing a graphene material through vapor phase chemical deposition. Uniform deposition, the preparation method is more complicated, and the cost is higher

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