Preparation method for reduced graphene or graphene film

A graphene film, graphene technology, applied in the direction of graphene, nano carbon, etc., can solve the problems affecting the wide application of graphene, poor electrical performance, incomplete reduction, etc.

Active Publication Date: 2012-12-19
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, GO is deoxidized to achieve heavy graphitization to obtain graphene through reduction method, so that the conductivity of graphene oxide is significantly increased, but the reduction is not complete, the proportion of carbon and oxygen elements in graphene is small, and the electrical properties are relatively low. Poor, which greatly affects the application of graphene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Take the graphite oxide prepared by the Hummers method, then weigh 10 mg of graphene oxide and place it in 10 mL of deionized water for ultrasonic dispersion to prepare a uniformly dispersed graphene oxide suspension (ie, hydrosol); add 10 mL of ammonia water, and slowly add 0.1g of zinc powder with a particle size of 1μm; graphene oxide quickly turns black after 5s; after the reaction is completed, use dilute hydrochloric acid to neutralize and wash off excess zinc powder;

[0066] Wherein, in every milligram of hydrosol, the content of zinc powder is 5mg; Described ammoniacal liquor is the ammoniacal solution that commercially available concentration is 28wt%, after adding ammoniacal liquor, NH in hydrosol 3 ·H 2 The concentration of O is 9.3wt%; the concentration of the dilute hydrochloric acid is 0.5mol / L.

[0067] Performance Testing:

[0068] The carbon to oxygen molar ratio (C / O) of the graphene material obtained after graphene oxide reduction is 8.09.

Embodiment 2

[0070]First prepare graphite oxide according to the Staudenmaier method, then weigh 10 mg of graphene oxide and place it in 10 mL of deionized water for ultrasonic dispersion to prepare a uniformly dispersed graphene oxide suspension (i.e. hydrosol), add 10 mL of ammonia water, and slowly add in the state of rapid stirring 0.1g of zinc powder with a particle size of 1 μm; the graphene oxide quickly turns black and then continues to react for 2 hours; after the reaction, neutralize and wash with dilute hydrochloric acid to remove excess zinc powder;

[0071] Wherein, in every milligram of hydrosol, the content of zinc powder is 5mg; Described ammoniacal liquor is the ammoniacal solution that commercially available concentration is 28wt%, after adding ammoniacal liquor, NH in hydrosol 3 ·H 2 The concentration of O is 9.3wt%; the concentration of the dilute hydrochloric acid is 5mol / L.

[0072] Performance Testing

[0073] The carbon to oxygen molar ratio (C / O) of the graphene ...

Embodiment 3

[0075] First prepare graphite oxide according to the Brodie method, then weigh 1 mg of graphene oxide and place it in 10 mL of deionized water for ultrasonic dispersion to prepare a uniformly dispersed graphene oxide suspension (ie, hydrosol), add 5 mL of ammonia water, and slowly add 0.1g of zinc powder with a particle size of about 0.2μm; graphene oxide quickly turns black; after the reaction is completed, use dilute hydrochloric acid to neutralize and wash off excess zinc powder;

[0076] Wherein, in every milligram of hydrosol, the content of zinc powder is 9.1mg; Described ammonia water is the ammonia solution that commercially available concentration is 28wt%, after adding ammonia water, NH in hydrosol 3 ·H 2 The concentration of O is 12.7wt%; the concentration of the dilute hydrochloric acid is 1mol / L.

[0077] Performance Testing

[0078] The carbon to oxygen molar ratio (C / O) of the graphene material obtained after graphene oxide reduction is 8.63.

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Abstract

The invention relates to a preparation method for reduced graphene. According to the invention, elementary zinc is used for reduction of oxidized graphene in the presence of ammonia so as to prepare graphene. The method is not sensitive to temperature and can be carried out at a normal temperature, a high temperature or a low temperature; oxygen-containing functional groups in the oxidized graphene are well removed, structure defects in graphene are restored at the same time, so graphene with high quality is prepared; and the method avoids usage of a great number of chemical reagents, can be carried out at room temperature, saves energy, poses little pollution to the environment and is applicable to reduction of graphene aqueous solutions and graphene films prepared by using a variety of methods.

Description

technical field [0001] The invention relates to the technical field of preparation of graphene materials, in particular to a process for preparing high-quality graphene by electrochemically reducing graphene oxide. Background technique [0002] Graphene is a sp 2 Hexagonal honeycomb-shaped two-dimensional nanomaterials composed of hybrid carbon atoms. Compared with expensive fullerenes and carbon nanotubes, graphene oxide (GO, Graphene Oxide) is cheap and easy to get raw materials. It is expected to be widely used in electronics, optoelectronics, capacitors and sensors as super nanomaterials. [0003] Graphene is currently the hardest nanomaterial, its tensile modulus can reach 1.01TPa, and its ultimate strength can reach 116GPa. Graphene is almost completely transparent, absorbs only 2.3% of light, and has excellent electrical and thermal conductivity and mechanical properties. Graphene also has special electromagnetic properties, for example, high electron mobility (σh...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/182
Inventor 李永锋
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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