Method for preparing graphene by rotationally shearing in electric field environment

Abstract

The invention discloses a method for preparing graphene by rotationally shearing in an electric field environment. Adopted experimental devices are a reaction container filled with electrolyte, high-purity graphite as a cathode, an inert electrode as an anode and a stirrer. The method comprises the following steps: switching on the cathode and the anode with a direct-current power supply, and stirring the electrolyte by using the stirrer; polarizing the cathode to strip the high-purity graphite under constant voltage, and simultaneously, stirring the electrolyte at a certain speed under the action of the stirrer, so that multi-layer graphene striped from the cathode is subjected to a shearing force again so as to prepare a solution containing graphene; cleaning the solution containing graphene for at least 5 times, ultrasonically dispersing, and centrifuging at a low speed; then, centrifuging a supernatant liquid of a prepared product at a high speed; and finally, drying to obtain graphene. The method disclosed by the invention is simple, convenient, rapid, safe, green and lower in cost; furthermore, natural graphene can be directly striped; due to the method, the traditional technology for preparing graphene by electrochemically striping is improved; and the yield and the quality for preparing a graphene film are increased.

Description

technical field [0001] The invention belongs to the field of graphene preparation, and in particular relates to a device and a method for preparing graphene by rotating and shearing in an electric field environment. Background technique [0002] Graphene is a new carbon-based nanomaterial in which a single layer of carbon atoms is tightly packed into a two-dimensional honeycomb structure, with a thickness of only 0.335nm. In 2004, Andre Κ. Geim (Andre.K.Geim) of the University of Manchester in the United Kingdom prepared and observed a single-layer graphene crystal with a very simple hand-tearing method, so he won the 2010 Physics Nobel Prize. prize. [0003] As a unique two-dimensional crystal, graphene has excellent mechanical properties, ultra-high thermal conductivity and carrier mobility, and relatively high carrier saturation drift velocity. It has been used in sensing devices, optoelectronics, energy conversion and Storage has received a lot of attention. Compared ...

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Problems solved by technology

[0005] In order to solve technical problems such as high growth cost, use of highly toxic chemical reagents, low yield, harsh requirements for equipment and instruments, non-environmental protection, many oxygen-containing functional groups or more structural defects in the existing graphene preparation technology, the present invention Provided is a device and method for preparing graphene by rotational shearing in an electric field environment

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