A kind of method for preparing graphene

Abstract

The invention discloses a graphene preparation method. The method comprises the processes of liquid phase expansion treatment, ultrasonic peeling and drying, and the ultrasonic peeling process comprises the following steps: adding a peeling solution and wormlike graphene aggregation obtained after the liquid phase expansion treatment into a tank body provided with a plurality of ultrasonic vibration rods in proportion, introducing compressed air into the tank body to bubble and stir in order to make the wormlike graphene aggregation dispersed and suspending in the peeling solution, and controlling the ultrasonic vibration rods to carry out ultrasonic vibration treatment for 0.5-20h in order to obtain a flocculent graphene suspension. The method allows the wormlike graphene aggregation to be uniformly dispersed in the peeling solution, so the peeling effect is improved, and the peeling time is shortened.

Description

Technical field [0001] The invention relates to the field of graphene, in particular to a method for preparing graphene. Background technique [0002] Since its discovery in 2004, graphene has attracted much attention as a new type of carbon material. It is a completely sp 2 The thickness of hybrid carbon atoms is only a single-atom layer or a quasi-two-dimensional crystal material with several single-atom layers. It has excellent properties such as high light transmittance and conductivity, high specific surface area, high strength and flexibility. It is expected to be widely used in high-performance nanoelectronic devices, optoelectronic devices, gas sensors, composite materials, field emission materials and energy storage. [0003] At present, there are many methods for preparing graphene. Among them, the "liquid phase expansion exfoliation method" is a low-cost, quality-controllable, and easy-to-industrial preparation method. This method mainly uses graphite intercalation comp...

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Problems solved by technology

However, the existing technology represented by this patent document still has the following defects in the actual use process: 1. The ultrasonic transducers are installed on the outer wall of the tank body with a hexahedral structure, and the distance between each transducer and the center of the tank body Different, resulting in uneven cavitation effect in each area of ​​the tank, which not only affects the stripping effect of graphene, but also reduces the utilization rate of graphene raw materials and the quality of graphene products

2. The ultrasonic transducer is installed on the outer wall of the tank. Due to the limited radiation area of ​​the ultrasonic wave, this structure limits the size of the tank. As a result, the ultrasonic stripping device using this structure is bound to be unable to prepare graphene products on a large scale

3. The transducers in this patent are bonded to the outer wall of the tank to form a vibrating plate. When graphene needs to be prepared on a large scale, dozens or even hundreds of transducers need to be glued on each side of the tank. The radiation area of ​​each transducer is small. This method not only increases the volume of the equipment, but also has the disadvantages of poor peeling effect, poor stability and inconvenient use, which is difficult to meet the requirements of industrial production.

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