Preparation method and application of large size and shape ratio graphene microsheet

Abstract

The invention relates to a preparation method and application of a large size and shape ratio graphene microsheet. The method comprises the following steps: arranging oxidized graphene paper or a mixed material containing partial impurities in a quartz tube, introducing H2 at a certain air pressure, and focusing a sample for performing scanning heating by using high-speed laser, wherein a complete graphene microsheet with less than ten atomic layers and high electric conductivity and high uniformity can be prepared in a room temperature environment under certain conditions, and the impurities in the material can be finely processed. The average atomic layer number of the prepared graphene is 6-8, the particle size is between 2.0 and 3.0nm, and the shape ratio of the microsheet can be close to 10,000. The optical and conductive performances are obviously superior to those of the graphene microsheet prepared by the traditional chemical reducing method; according to fine regulation of the laser scanning parameters, the method has the advantages of repeatedly performing sample treatment and pattern processing, along with high target processability, controllable layer number and size of the microsheet, simple equipment, cleanliness, high efficiency and flexible operation, and has excellent industrial application value.

Description

technical field [0001] The invention relates to a preparation method of graphene microchips, in particular to a preparation method of graphene microchips with large size and shape ratio and its application. Background technique [0002] Graphene microflakes generally refer to ultra-thin graphene layered stacks with more than 10 carbon layers and a thickness in the range of 5-100 nanometers. In some literatures, it is also called GrapheneNanosheets. Graphene microsheets maintain the original planar carbon six-membered ring conjugated crystal structure of graphite, and have excellent mechanical strength, electrical conductivity, and thermal conductivity, as well as good lubrication and high temperature resistance. and anti-corrosion properties. Compared with ordinary graphite, the thickness of graphene microsheets is in the nanoscale range, but its radial width can reach several to tens of microns, and it has a large shape ratio (diameter / thickness ratio). Graphene microshee...

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Problems solved by technology

[0005] The use of laser heating to reduce graphene oxide solution (or spin-coating solution) and the patterning preparation on this basis have been reported many times, but the method used before requires the laser to directly irradiate the graphene oxide dispersed in the solvent, not only the reduced Graphene is easy to agglomerate, and its own impurities or weak acid substances in the solution may prevent partial reduction of carboxyl groups on the edge of graphene oxide, so that larger-sized graphene microplates cannot be obtained

In fact, it is quite difficult to precisely control the number of atomic layers or the size of the product by using the traditional solution irradiation method to reduce graphene oxide.

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