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The preparation method of graphene
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A graphene and graphite technology, applied in the field of organic semiconductor materials, can solve the problems of long reaction time and low yield, and achieve the effects of few production steps, simple equipment and high purity
Active Publication Date: 2014-10-01
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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The graphene synthesized by this method has high purity, but the reaction time is relatively long, and the yield is only 1% to 5%.
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Embodiment 1
[0028] A kind of preparation method of high-purity graphene, its technological process is as follows:
[0029] (1) Provide expandable graphite with an expansion degree of 300ml / g;
[0030] (2) The expandable graphite is fed into an inert mixed gas (5%H 2 and 95% Ar), the temperature is rapidly raised to 1000°C, and after heating for 30s, the worm-like graphite is obtained by thermal exfoliation;
[0031] (3) adding the worm-like graphite in (2) into the NMP (N-methylpyrrolidone) solution to prepare a worm-like graphite suspension with a concentration of 0.1g / L;
[0032] (4) At first this worm-like graphite suspension is ultrasonically dispersed for 10min to obtain a uniformly dispersed solution, then centrifuged at a centrifugal speed of 900rpm for 60min, then washed three times with ethanol, washed three times with deionized water to make the solution neutral, and finally Dry at 100°C for 30 hours in a vacuum environment to obtain a high-purity single-layer or few-layer gra...
Embodiment 2
[0034] A kind of preparation method of high-purity graphene, its technological process is as follows:
[0035] (1) Provide expandable graphite with an expansion degree of 300ml / g;
[0036] (2) After the expandable graphite is heated for 15min by a microwave reactor with a power of 1500W, it is thermally peeled off to obtain worm-like graphite;
[0037] (3) the worm-like graphite in (2) is added in the DMF solution, is mixed with the worm-like graphite suspension that concentration is 100g / L;
[0038] (4) At first this worm-like graphite suspension is ultrasonically dispersed for 60min to obtain a uniformly dispersed solution, then centrifuged at a centrifugal speed of 900rpm for 10min, then washed three times with ethanol, and washed three times with deionized water to make the solution neutral, and finally Dry at 200°C for 20 hours in a vacuum environment to obtain a high-purity single-layer or few-layer graphene material.
[0039] see figure 2 , shown is the scanning ele...
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Abstract
A preparation method of graphene comprises the following steps: heating expandable graphite and peeling to form vermicular graphite; adding the vermicular graphite into a solvent to prepare a vermicular graphite suspension liquid; carrying out ultrasonic disperse and centrifugation on the vermicular graphite suspension liquid; washing and drying to obtain the graphene. Compared with a traditional preparation method, the preparation method of the invention has advantages of low cost and convenient operation, and is especially suitable for large-scale industrial production.
Description
【Technical field】 [0001] The invention belongs to the technical field of organic semiconductor materials, and in particular relates to a preparation method of graphene. 【Background technique】 [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, due to its unique structure and photoelectric properties, it has received widespread attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: ①High strength, Young's modulus, (1,100GPa), breaking strength: (125GPa); ②High thermal conductivity, (5,000W / mK); ③High electrical conductivity, carrier transport rate, (200,000cm 2 / V·s); ④ high specific surface area, (theoretical calculation value: 2,630m 2 / g). In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale s...
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