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Graphene powder with three-dimensional structure and preparation method thereof

A technology of graphene powder and three-dimensional structure, applied in the direction of graphene, nano-carbon, etc., can solve the problems of restricting the development and application of graphene, serious link pollution, and many graphene defects, so as to achieve easy removal by pickling and simple production management , a wide range of effects

Active Publication Date: 2019-07-05
崔云
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high process requirements, high cost, and serious link pollution of growing graphene on transition metals, the prepared two-dimensional graphene film; alumina has various structures, and the structure is not easy to control when preparing alumina templates. The structure is complex, resulting in graphene bending, folds, many defects, SP 2 Hybridized carbon has less bonds and a low carbon-to-oxygen ratio; magnesium oxide has octagonal crystal faces and regular triangular crystal faces, resulting in many graphene defects, SP 2 Hybridized carbon has less bonds and a lower carbon-to-oxygen ratio
[0005] It can be seen that the three-dimensional graphene prepared by the existing method has many defects, and the SP 2 Hybrid carbon has less bond formation and low carbon-to-oxygen ratio, which restricts the development and application of graphene to a certain extent.

Method used

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  • Graphene powder with three-dimensional structure and preparation method thereof
  • Graphene powder with three-dimensional structure and preparation method thereof
  • Graphene powder with three-dimensional structure and preparation method thereof

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preparation example Construction

[0033] The present invention has the preparation method of the graphene powder of three-dimensional structure, comprises the following operation steps:

[0034] (1) Feed CaO and deionized water according to the mass ratio of 1:3, and after full reaction, sort, purify, and dry to obtain Ca(OH) 2 Powder; Ca(OH) 2 The powder is placed in a calciner, kept at a temperature range of 500°C to 700°C, and calcined for 30 minutes to 5 hours, then passed through a dry inert gas, and cooled to room temperature to obtain a textured CaO template;

[0035] (2) Place the textured CaO template obtained in step (1) in a furnace with a predetermined mass, continuously feed an inert gas into the furnace, raise the temperature to 720°C-920°C, and keep it for 1-30 minutes;

[0036] (3) Inert gas and carbon source are continuously introduced into the furnace, and the mass ratio of the introduced carbon source to the textured CaO template is 1: (8-12). After passing through the carbon source, after...

Embodiment 1

[0044] (1) Feed CaO and deionized water according to the mass ratio of 1:3, sort, purify, and dry after full reaction to obtain white solid Ca(OH) 2 ; Will get Ca(OH) 2 In the calcination furnace, keep the temperature of 700°C for 30 minutes and then cool to room temperature under nitrogen atmosphere, and sort the 300 mesh or more to obtain the textured CaO template;

[0045](2) Get 200 grams of the textured CaO template obtained in step (1) and place it in a tubular rotary CVD furnace, continuously feed nitrogen into the furnace tube, make the oxygen content in the furnace tube less than 1ppm, and place the furnace tube under a nitrogen atmosphere Heating, the heating rate of the furnace tube is 10°C / min, the temperature is raised to 500°C, and then the temperature is raised to 850°C at 5°C / min, and the temperature is kept for 5 minutes;

[0046] (3) Continuously feed 20 grams of nitrogen and cyclohexane into the furnace tube by bubbling method. At this time, the white GaO p...

Embodiment 2

[0050] (1) Feed CaO and deionized water according to the mass ratio of 1:3, sort, purify and dry after full reaction to obtain white solid Ca(OH) 2 ; Will get Ca(OH) 2 In the calcination furnace, keep the temperature of 650°C for 1 hour and then cool to room temperature, and sort through 300 mesh or more to obtain the textured CaO template;

[0051] (2) Get 200 grams of the textured CaO template obtained in step (1) and place it in a tubular rotary CVD furnace, continuously feed nitrogen into the furnace tube, make the oxygen content in the furnace tube less than 1ppm, and place the furnace tube under a nitrogen atmosphere Heating, the heating rate of the furnace tube is 10°C / min, the temperature is raised to 500°C, and then the temperature is raised to 800°C at 5°C / min, and the temperature is kept for 15 minutes;

[0052] (3) Continuously feed 20 grams of nitrogen and n-hexane into the furnace tube by bubbling method. At this time, the white GaO powder in the furnace is grad...

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Abstract

Graphene powder with a three-dimensional structure and a preparation method thereof are provided. Textured CaO powder is adopted as a template, and the graphene powder with a three-dimensional structure is prepared through chemical vapor deposition. Because the textured CaO crystals have a regular hexahedron structure and the template is easy to remove, prepared graphene has few defects, the SP2 carbon bonding ratio is high, and the carbon-oxygen ratio is high. The carbon-oxygen ratio of the three-dimensional textured graphene powder is increased, and almost all carbon atoms are bonded in SP2carbon bonding manner, thus improving electrical conductivity, thermal conductivity and mechanical properties. The graphene powder and the method are safe, environmentally friendly and pollution-free,and can realize zero emission of 'three wastes'.

Description

technical field [0001] The invention belongs to the technical field of new materials and their preparation, and in particular relates to a graphene powder with a three-dimensional structure and a preparation method thereof. Background technique [0002] Graphene is a carbon sheet composed of C atoms with a hexagonal lattice structure, and the number of stacked layers is not more than 10. However, two-dimensional graphene is easy to stack and agglomerate to form graphite microflakes during storage and use, and its performance will be greatly reduced, which limits its application. Three-dimensional structured graphene refers to a three-dimensional material with a certain space frame structure formed by graphene sheets. On the one hand, it can avoid the stacking effect between graphenes. On the other hand, three-dimensional structured graphene has multi-layer channels, which not only retains the The main properties of alkene have also further expanded its application fields. ...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B32/184Y02E60/10
Inventor 崔云
Owner 崔云