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Preparation method of graphene for heater

A graphene and heater technology, applied in the field of graphene, can solve the problems of graphene's electrical conductivity and specific surface area reduction, graphene crystal structure defects, affecting applications, etc., to achieve large-scale production, good conductivity and specific surface area , The effect of controllable production process

Inactive Publication Date: 2017-01-04
ANHUI NINGGUO TIANCHENG ELECTRICAL APPLIANCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art discloses a variety of graphene preparation methods, including graphite oxide reduction method, micromechanical exfoliation method, chemical vapor deposition method, SiC epitaxial growth method and electrochemical method, etc., wherein micromechanical exfoliation method, chemical vapor deposition method , SiC epitaxial growth method and electrochemical method all have the disadvantages of complicated process and high cost, while the graphite oxide reduction method with the advantages of low cost, quantifiable preparation, and simple method has become a research hotspot
When preparing by redox method, because single-layer graphene is very thin, it is easy to agglomerate, resulting in the reduction of graphene's electrical conductivity and specific surface area, which further affects its application in optoelectronic devices. Defects in the crystal structure of alkenes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of heater graphene specifically comprises the following steps:

[0023] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in the reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 25 minutes, keep warm for 4 hours, and cool to room temperature naturally , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;

[0024] (2) Oxidation of graphite:

[0025] A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;

[0026] B. Medium-temperature reacti...

Embodiment 2

[0033] A kind of preparation method of heater graphene specifically comprises the following steps:

[0034] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in a reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 20 minutes, keep warm for 5 hours, and cool naturally to room temperature , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;

[0035] (2) Oxidation of graphite:

[0036] A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;

[0037] B. Medium-temperature reaction...

Embodiment 3

[0044] A kind of preparation method of heater graphene specifically comprises the following steps:

[0045] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in the reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 22 minutes, keep warm for 5 hours, and cool to room temperature naturally , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;

[0046] (2) Oxidation of graphite:

[0047]A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;

[0048] B. Medium-temperature reactio...

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Abstract

The invention relates to the technical field of graphene, in particular to a preparation method of graphene for a heater. The method is characterized in that the graphene is prepared by adopting an oxidation-reduction method and specifically comprises the following steps: firstly, peroxidation of the graphene; secondly, oxidization of graphite, wherein oxidation treatment comprises four stages, namely low-temperature reaction, medium-temperature reaction, high-temperature reaction and after treatment; in the low-temperature reaction and the medium-temperature reaction, an ultrasonic and mechanical stirring combined action is adopted, and hydrogen is introduced into a reaction system; thirdly, preparation of the graphene, wherein a drying mode in the preparation process adopts freeze drying. According to the preparation method of the graphene for the heater, provided by the invention, a production process is controllable, and large-scale production can be realized; nano ions are not easy to agglomerate in the preparation process; a prepared graphene crystal is complete in structure and excellent in conductivity.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene for a heater. Background technique [0002] Graphene, which suddenly came into public view due to the Nobel Prize, as a new type of two-dimensional nano-carbon material, has attracted widespread attention and in-depth research in the scientific community. Graphene is a new type of carbonaceous material with the thickness of a single layer of carbon atoms, which is arranged in a two-dimensional honeycomb lattice structure. It is considered to be the basic unit of all other dimensional carbonaceous materials. Zero-dimensional fullerenes, curled into one-dimensional carbon nanotubes, stacked into three-dimensional graphite, etc. Graphene is made of carbon atoms with sp 2 The monoatomic carbon layer formed by hybridization has a very stable structure and has excellent mechanical properties, peculiar electrical properties and good thermal properties....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/02C01B2204/22
Inventor 汪洋陈启志江盈肖美玲
Owner ANHUI NINGGUO TIANCHENG ELECTRICAL APPLIANCES
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