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Method for preparing three-dimensional graphene through doping of nanoparticles

A nanoparticle and graphene technology, which is applied in the field of nanomaterials, can solve the problems of insufficient connection force between lamellae, insignificant spatial network structure, weak electrical conductivity, etc., and achieve the effect of improving performance.

Active Publication Date: 2014-04-23
慧迈材料科技(广东)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The chemical bonds between the three-dimensional graphene sheets prepared by this kind of inorganic method are mainly connected by ionic bonds or van der Waals force, and the connection force between the sheets is not tight enough, resulting in weak mechanical properties of graphene, inconspicuous spatial network structure, and poor electrical conductivity. Not strong, etc., to a large extent limit the application of three-dimensional graphene

Method used

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  • Method for preparing three-dimensional graphene through doping of nanoparticles
  • Method for preparing three-dimensional graphene through doping of nanoparticles

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Embodiment 1

[0027] Weigh 5 g of single-walled carbon nanotubes, and mix H with a volume ratio of 6:1 2 SO 4 / HNO 3 The ratio is 400ml of concentrated acid, carbon nanotubes and concentrated acid are condensed and refluxed at 150 °C for 8 hours, and the solution is cooled to room temperature, and the acid is removed by vacuum filtration with a 0.45um polytetrafluoroethylene membrane, centrifuged and washed 4 times at 4000 pm, and the Dry in vacuum at 80°C for 12 h. Weigh 1000 mg of graphene oxide prepared by the Hummers method, dissolve it in 100 ml of distilled water, dissolve and sonicate for 30 minutes to prepare a 10 mg / ml GO solution, add 600 mg of CNT and sonicate for 30 minutes, stir for 12 hours, put the evenly stirred solution into A polytetrafluoroethylene reactor was heated to 180°C and reacted for 12 hours to obtain three-dimensional graphene cross-linked by graphene and carbon nanotubes. Its physical map and scanning electron microscope photos are as follows: figure 1 As ...

Embodiment 2

[0030] Weighed 800 mg of graphene oxide and dissolved it in 100 ml of distilled water for 30 min to prepare an 8 mg / ml GO solution. Added 800 mg of curdlan and stirred thoroughly to make the solution gel. Put the gel solution into a 10 ml reagent bottle and react at 200 °C for 12 h to obtain three-dimensional graphene cross-linked by curdlan gum and graphene oxide. Its physical map and SEM image are as follows figure 2 As shown, it can be seen from the figure that the curdlan particles are attached to the graphene sheet to form a three-dimensional network structure.

[0031] Example 3

Embodiment 3

[0033] Weigh 1.7g of AgNO 3 1M AgNO 3 Solution, weigh 0.56g of KOH to make 1M KOH solution, draw 10 ml of AgNO 3 React with 15 ml of KOH solution to form AgOH precipitate, add appropriate amount of ammonia water to dissolve AgOH and then make silver amine solution in a 100ml volumetric flask. Dissolve graphene oxide in deionized water and ultrasonically disperse for half an hour to prepare a GO dispersion with a concentration of 15 mg / ml. Take 6 ml of a well-proportioned silver amine solution and disperse it in the graphene oxide solution, and stir for 24 hours. Add an appropriate amount of starch solution to reduce silver amine to form silver nanoparticles, put the solution of reduced graphene oxide plus silver nanoparticles into a polytetrafluoroethylene reactor, and react at 190 ° C for 12 h to obtain silver nanoparticles doped 3D graphene. Its physical map and SEM image are as follows image 3As shown, it can be seen from the figure that the three-dimensional network s...

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Abstract

The present invention discloses a method for preparing three-dimensional graphene through doping of nanoparticles. The technical scheme comprises that: graphite is adopted as a base material to prepare graphene oxide lamella, nanoparticles are attached on the graphene oxide lamella, and the three-dimensional graphene is formed through self-assembly between the graphene oxide lamella. According to the present invention, the reaction temperature and the graphene oxide solution concentration are adjusted to form the opened-cell and closed-cell (different densities) three-dimensional graphene; and the prepared three-dimensional graphene can be widely used in the fields of supercapacitors, oil absorption, seawater desalination and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing net-like three-dimensional graphene. Background technique [0002] Graphene, a kind of SP 2 Hybrid planar two-dimensional structures. Since its discovery in 2004, it has become a new member of the carbon family (zero-dimensional fullerene, one-dimensional carbon nanotubes, two-dimensional graphene and three-dimensional graphite). Because of its unique two-dimensional structure, it has the advantages of light weight, high strength, high transparency, and good conductivity, and can be widely used in energy, environment, sensing, and biology. Known as "the new material of the 21st century", research on it has also emerged in an endless stream in recent years. [0003] In recent years, the doping of nanoscale molecules on the three-dimensional graphene spatial network structure has become a research hotspot, because the three-dimensio...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00C01B32/184
Inventor 闵永刚童宋照刘屹东杨文斌范天举宋建军
Owner 慧迈材料科技(广东)有限公司
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