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A technology of graphene film and graphite, which is applied in the field of graphene film preparation, can solve the problems of reduced electrical conductivity, etc., and achieve the effects of good conductivity, good reduction effect, and good transparency
Inactive Publication Date: 2011-04-13
SOUTHEAST UNIV
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The graphene film thickness that this method gained is relatively speaking, still a bit thick, and electrical conductivity obviously reduces simultaneously (Eda G, Fanchini G, et al . Nature Nanotec. 2008, 3, 270)
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Embodiment 1
[0021] In the first step, add 46mL of concentrated sulfuric acid to the Erlenmeyer flask and place it in an ice bath at 0±1°C, then slowly add 2g of expandable graphite and 1g of sodium nitrate, and then add 6g of potassium permanganate in four times (time interval After completion, move the Erlenmeyer flask to room temperature and place it for 16 hours (with constant stirring), then slowly and continuously add 92 mL of water with a syringe and raise the temperature to 98°C for 15 minutes; after the end, use warm water Dilute to 280mL, and add 6mL 30%wt hydrogen peroxide; the next step is to wash while hot, first wash 7 times with 5%wt dilute hydrochloric acid to remove sulfate ions, and then wash 7 times with deionized water to remove chloride ions And check with silver nitrate; finally, dry at 60°C for 15h;
[0022] In the second step, put the dry graphite oxide on the quartz boat and send it into the quartz tube, open the nitrogen valve, pass nitrogen gas into the quartz tu...
Embodiment 2
[0026] The preparation method is basically the same as in Example 1, except that graphite oxide is replaced by expanded graphite, and the reduced graphene obtained can be sprinkled on the water surface to obtain a similar figure 1 The results shown.
[0027]
Embodiment 3
[0029] The preparation method is basically the same as in Example 1, except that the quartz tube is not filled with nitrogen, but is evacuated to obtain graphene.
[0030]
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Abstract
The invention discloses a method for preparing a graphene film, which comprises the following steps of: putting oxidized graphite or expandable graphite into a heating furnace, then quickly heating the graphite to the temperature of between 700 and 1,500 DEG C, maintaining the temperature for 0.5 to 30 minutes, naturally cooling to obtain flocculent graphite, directly grinding a certain amount of flocculent graphite into powder, putting the powder into a beaker filled with liquid, standing or stirring or ultrasonically treating the solution, and then standing the solution for certain time to form the graphene film on the liquid level. In the method, the graphene obtained by high-temperature reduction and oxidation of the graphite is used as a film forming raw material and has the advantages of good reduction effect and good film electrical conductivity; and meanwhile, the very thin film is obtained by using mutual effect between the graphene and the surface tension of the liquid, and has very good transparency.
Description
[0001] Technical field [0002] The present invention is a graphite scarce preparation technology, which involves a method of preparation of a graphene film. [0003] Background technique [0004] With the discovery of graphene, its excellent electrical properties, mechanical properties, thermal nature, and magnetic properties have aroused widespread attention.At the same time, the method of preparing graphene is also endless. There are mainly micro -mechanical stripping methods (Novoselov KS, Geim Ak, Morozov SV, Jiang D, ZHANG Y, Dubonos SV et al . Science 2004, 306, 666), chemistry (Stankovich S, Dikin DA, et al . Carbon 2007, 45, 1558) and extension growth (Kim KS, zhao y, et al . Nature 2009, 457, 706).The graphene film has many excellent properties, which is precisely because of many methods to prepare film.Among them, the outer extension and CVD method (Hofrichter J, et al . Nano lett. 2010, 10, 36; lee yb, bae sk, et al NANO Lett. 2010, 10, 490), can obtain a thin film wi...
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