A kind of conductive graphene and preparation method thereof

Abstract

The invention discloses conductive graphene and a preparation method thereof. The preparation method of the conductive grapheme comprises the following steps: S1, mixing a strong oxidant and hydrogen peroxide with graphite, heating to 60-80 DEG C, reacting for 3-5 hours, and performing ultrasonic reaction for 30-50min; S2, adding boron hydride and alkali, reacting for 2-4 hours, performing centrifugal separation by using a centrifuge, washing with anhydrous ethanol for 3-4 times, and then drying at 80-100DEG C to obtain the grapheme. The preparation method provided by the invention is fast, simple and convenient; by the preparation method, the production cost of the grapheme can be greatly reduced and the production efficiency can be improved; the square resistance of the prepared grapheme is smaller than 145 milliohms.

Description

technical field [0001] The invention relates to the field of conductive new materials, in particular, the invention relates to a conductive graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional sp 2 Hybrid carbon materials are the basic building blocks of allotropes of carbon in other dimensions. Affected by its special structure, graphene has a series of excellent physical and chemical properties: high fracture strength (125GPa); high-speed carrier mobility (2×10 5 cm 2 V -1 the s -1 ) and thermal conductivity (5000Wm -1 K -1 ); large specific surface area (2630m 2 / g). These outstanding features make graphene applicable to a variety of practical applications. Among them, the use of graphene as a conductive material and electrode material has become the focus of research in the field of clean energy. [0003] At present, a large number of domestic and foreign patents and literature reports on the preparation of graph...

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Problems solved by technology

However, most of the chemical redox methods disclosed in patents or documents use hydrazine hydrate to prepare graphene. Although hydrazine hydrate has strong reducibility, it has strong toxicity and carcinogenicity at the same time, which is not conducive to environmental protection. When oxidizing graphite, the absence of some carbon atoms in the ultrasonic process and the residue of oxygen-containing functional groups in the reduction process often make the prepared graphene contain more defects, which reduces the conductivity, thereby limiting its impact on the quality of graphene. Applications in demanding fields (such as touch screen conductive industry, OLED electrode conductive industry, transparent conductive industry)

[0005] There are also a small number of patents disclosing the method of preparing graphene using borohydride salt as a reducing agent, but the process of the existing preparation method is still relatively cumbersome and time-consuming. In addition, the conductivity of the prepared graphene is still poor, which is difficult to meet Requirements for touch screen conductive industry, OLED electrode conductive industry, transparent conductive industry and other fields

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