A method for preparing graphene based on thermal cracking of template-solid carbon source

Abstract

The invention relates to a method for preparing graphene on the basis of template agent-solid phase carbon source thermal cracking. The method comprises the following steps of (1) acid washing treatment: using sulfuric acid, nitric acid, hydrochloric acid or mixed acid of two acids from sulfuric acid, nitric acid, hydrochloric acid for performing acid washing treatment on template agent powder; (2) melting or solution mixing: performing melting or solution mixing on the template agent powder subjected to the acid washing treatment and the solid phase carbon source; (3) thermal cracking: underthe inert gas protection, raising the temperature to a thermal cracking temperature; performing heat insulation to obtain a composite material of the graphene / template agent; (4) template agent removal: performing acid washing and freeze drying treatment on the graphene / template agent composite material to obtain graphene. The layer number of the finally prepared graphene powder is 1 to 10; the electric conductivity is 1 to 1000S / cm. The preparation method is simple; the carbon source selection is wide; the low-cost preparation of the graphene can be realized; the prepared graphene and composite material thereof can be directly applied to the fields of functional paint, fiber and the like; wide application prospects are realized.

Description

technical field [0001] The invention belongs to the field of graphene preparation, in particular to a method for preparing graphene based on template agent-solid-phase carbon source thermal cracking. Background technique [0002] Since 2004, a professor of physics at the University of Manchester used a very simple mechanical exfoliation method to successfully separate and observe a single-layer two-dimensional graphene nanocrystal structure from graphite for the first time. Stable existence at non-absolute zero" conclusion, graphene as a new nanomaterial has attracted widespread attention worldwide, and set off a research boom in the fields of basic research and applied research. Single-layer graphene refers to a two-dimensional structure formed by the arrangement of carbon atoms on a layer of dense, wrapped honeycomb crystal lattices, that is, it presents a sp 2 The single-layer honeycomb lattice structure composed of hybridized carbon atoms has a thickness of only 0.335nm...

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Problems solved by technology

[0005] Invention patent CN 103663441 B discloses a method involving the preparation of nano-metal graphene materials using phthalocyanine compounds, phthalocyanine polymers and their derivatives as starting materials, although the final product is obtained under the action of a specific metal catalyst , the process is relatively simple, but the cracking time required by this method is longer and the selection range of its solid-phase carbon source is narrower, and the preparation efficiency is lower; the patent CN104370285A discloses a macro-preparation of high-quality graphene using biomineralized materials The method of the biomineralization material (such as diatomaceous earth) is calcined at a high temperature, and then the carbon source is deposited on it to obtain graphene. Although this method is efficient and environmentally friendly, it requires an additional supply of hydrogen when using a gas-phase carbon source. Atmosphere, the size and shape of the final product graphene are difficult to control

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