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A kind of wrapped single-layer graphene oxide/carbon nanotube composite and its preparation method

A technology of graphene nanosheets and carbon nanotubes, applied in carbon compounds, chemical instruments and methods, nanotechnology, etc., can solve problems such as troublesome operation, difficult method conditions, uneven distribution of graphene oxide and carbon nanotubes, etc. Achieve the effect of simple method, uniform distribution and easy operation

Active Publication Date: 2018-08-17
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the method conditions for preparing wrapped single-layer graphene oxide / carbon nanotube composites are difficult, the operation is cumbersome, and the distribution of graphene oxide and carbon nanotubes in the prepared composite is not uniform. These objective problems Hinders the application of wrapped single-layer graphene oxide / carbon nanotube composites

Method used

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  • A kind of wrapped single-layer graphene oxide/carbon nanotube composite and its preparation method
  • A kind of wrapped single-layer graphene oxide/carbon nanotube composite and its preparation method
  • A kind of wrapped single-layer graphene oxide/carbon nanotube composite and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) Preparation of single-layer graphene oxide nanosheets: The modified Hummers method (Marcano, etc., ACSnano, 2010, 4(8): 4806) was used to prepare graphite oxide. Weigh 3g graphite powder into a 500mL three-necked flask, add 360mL concentrated H 2 SO 4 (98%) and 40mL H 3 PO 4 (85%), slowly add 18g KMnO under ice bath conditions 4 Keep the mixed solution at 50℃ and stir for 12h. After cooling the reaction mixture to room temperature, pour it on ice cubes made of 400mL deionized water, and slowly add about 3mL H under stirring. 2 O 2 (30%), after filtering the mixture, it was washed 5 times by centrifugation with HCl (10%) at 10,000 rpm. Then, the obtained product was put into a dialysis bag, dialyzed for 3 weeks, and then placed in a vacuum freeze dryer to dry for 48 hours to constant weight to obtain brown graphite oxide. Prepare 1mg / mL graphite oxide solution, ultrasonically peel for 4h, use a high-speed centrifuge to centrifuge at 8,000 rpm, take the centrifugal flui...

Embodiment 2

[0063] Repeat Example 1, except that the peeling described in step (1) uses ultrasonic peeling for 6 hours, and the separation uses centrifugal separation. The centrifuge is centrifuged at 6,000 rpm for 50 minutes, the centrifugal fluid is taken out, and the centrifuge is collected at 12,000 rpm for 20 minutes. The sedimentation A. The yield was 84%.

Embodiment 3

[0065] Repeat Example 1, except that the mass fraction of nitric acid in step (2) is 40%, the mass fraction of concentrated sulfuric acid is 80%, and the volume ratio of nitric acid and sulfuric acid is 1:2; the heating temperature of acidification treatment is 90°C, and the heating The time is 3h; the ultrasonic cutting time is 60min, the ultrasonic power is 200W; the separation adopts centrifugal separation, the centrifuge is centrifuged at 8,000 rpm for 20 min, the centrifugal liquid is taken out, and the sediment that is centrifuged at 12,000 rpm for 20 min is collected B. After separation and drying, vacuum drying at 80°C. The yield was 56%.

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Abstract

The invention discloses a wrapped monolayer graphene oxide / carbon nano tube compound and a preparation method thereof. The compound is in a particle type; the compound particle has a core-shell type wrapping structure by adopting a monolayer graphene oxide nanosheet as a shell and an acidized and cut carbon nano tube as a core, or a closed dumpling-shaped wrapping structure by adopting a single monolayer graphene oxide nanosheet as a dumpling-wrapper and the acidized and cut carbon nano tube as a dumpling-stuffing. The technical scheme provided by the invention has the characteristics of simplicity, convenience, and easiness in operation. Due to the bending of a graphene oxide sheet layer and the electric charge loaded on the surface of the graphene oxide sheet layer, the obtained compound material can be highly dispersed, not easy liable to agglomeratereunite and cake, and easy to store, and meanwhile, the compound material can be easily reduced to obtain the graphene / carbon nano tube compound material. The theoretical research proves that the wrapped novel special structure has strong electrical conductivity and mechanical performance.

Description

Technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials engineering, and specifically relates to a wrapped single-layer graphene oxide / carbon nanotube composite and a preparation method thereof. Background technique [0002] Graphite (stacked layer by layer of graphene) is the softest of minerals, but after it is separated into graphene with the thickness of one carbon atom, its performance changes suddenly. Its hardness is high and diamond is still very good. The toughness, and can bend. When the Royal Swedish Academy of Sciences issued the 2010 Nobel Prize in Physics, it once compared its strength like this: a hammock made of single-layer graphene can carry a 4kg rabbit. It can be estimated that if multiple layers of graphene are stacked together to make the thickness the same as the food wrap, it can carry a 2-ton car. [0003] Graphene and carbon nanotubes are both excellent one-dimensional and two-dimensional carbon materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198C01B32/168B82Y30/00B82Y40/00
CPCC01P2002/82C01P2004/04C01P2004/50C01P2004/61C01P2004/62C01P2004/80
Inventor 邓克勤周建红李春香
Owner HUNAN UNIV OF SCI & TECH
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