Preparation method of graphene conductive paper with controllable conductivity

A technology of graphene and electrical conductivity, which is applied in the field of preparation of graphene conductive paper, can solve the problems that the conductivity of graphene has not been studied in depth, and achieve the effect of wide application prospects

Inactive Publication Date: 2014-01-29
QINGDAO HUAGAO GRAPHENE CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is well known that carbon materials such as graphene are modified with diazonium salts (J.R.Lomeda, C.D.Doyle, D.V.Kosynkin, W.-F.Hw...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pretreatment process

[0030] 1) Take 2g of graphite, 1g of phosphorus pentoxide, 3-5ml of concentrated sulfuric acid, and 1g of potassium persulfate, mix and heat to 80°C;

[0031] 2) Insulate at 75°C-80°C for 20-40min to oxidize the mixture;

[0032] 3) After the oxidation is finished, cool down to room temperature naturally, then dilute the mixture with 15-20ml of distilled water, filter with suction, and rinse the remaining filter cake with distilled water until neutral;

[0033] (2) Oxidation process

[0034] 1) Mix 2g of filter cake with 45-50ml of concentrated sulfuric acid at 0°C, and slowly add 5-6g of potassium permanganate powder into the mixture, stirring continuously, and controlling the temperature below 20°C during the stirring process;

[0035] 2) The mixture in step 1) was placed in an oil bath at 30-40°C and stirred for 2 hours;

[0036] 3) Add 90-100ml of distilled water to dilute after the reaction and continue the reaction for 15 minutes. Aft...

Embodiment 2

[0048] (1) Pretreatment process

[0049] 1) Take 2g of graphite, 1g of phosphorus pentoxide, 3-5ml of concentrated sulfuric acid, and 1g of potassium persulfate, mix and heat to 80°C;

[0050] 2) Insulate at 75°C-80°C for 20-40min to oxidize the mixture;

[0051] 3) After the oxidation is finished, cool down to room temperature naturally, then dilute the mixture with 15-20ml of distilled water, filter with suction, and rinse the remaining filter cake with distilled water until neutral;

[0052] (2) Oxidation process

[0053] 1) Mix 2g of filter cake with 45-50ml of concentrated sulfuric acid at 0°C, and slowly add 5-6g of potassium permanganate powder into the mixture, stirring continuously, and controlling the temperature below 20°C during the stirring process;

[0054] 2) The mixture in step 1) was placed in an oil bath at 30-40°C and stirred for 2 hours;

[0055] 3) After the reaction, add 90-100ml of distilled water to dilute and continue to react for 15 minutes. After ...

Embodiment 3

[0067] (1) Pretreatment process

[0068] 1) Take 2g of graphite, 1g of phosphorus pentoxide, 3-5ml of concentrated sulfuric acid, and 1g of potassium persulfate, mix and heat to 80°C;

[0069] 2) Insulate at 75°C-80°C for 20-40min to oxidize the mixture;

[0070] 3) After the oxidation is finished, cool down to room temperature naturally, then dilute the mixture with 15-20ml of distilled water, filter with suction, and rinse the remaining filter cake with distilled water until neutral;

[0071] (2) Oxidation process

[0072] 1) Mix 2g of filter cake with 45-50ml of concentrated sulfuric acid at 0°C, and slowly add 5-6g of potassium permanganate powder into the mixture, stirring continuously, and controlling the temperature below 20°C during the stirring process;

[0073] 2) The mixture in step 1) was placed in an oil bath at 30-40°C and stirred for 2 hours;

[0074] 3) After the reaction, add 90-100ml of distilled water to dilute and continue to react for 15 minutes. After ...

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Abstract

The invention relates to a preparation method of a graphene conductive paper with controllable conductivity. The preparation method comprises the following steps of: (1) a pretreatment process; (2) an oxidation process; (3) a reduction process: diluting oxidized graphene dispersion liquid by using distilled water, then regulating a pH value by using ammonia, and adding hydrazine hydrate to prepare graphene dispersion liquid; (4) a modifying process: dissolving phenylamine into a solution prepared from concentrated hydrochloric acid and distilled water, dropping a sodium nitrite solution, filtering to obtain filter liquor, adding sodium tetrafluoroborate to the filter liquor, successively flushing obtained diazonium salt by using ice water and cold ether, and mixing the graphene dispersion liquid and the diazonium salt for reaction; (5) a film preparation measuring process: carrying out suction filtration on a reacted mixed solution through a water-phase film, drying to obtain a graphene film, measuring the sheet resistance of the film by using a four-probe system, and converting conductivity. The preparation method disclosed by the invention achieves the purpose of controlling the graphene conductivity by quantificationally destroying the conjugated structure of graphene by utilizing the diazonium salt and has wide application prospect in the fields of electric devices, electrodes, and the like.

Description

technical field [0001] The invention belongs to the field of modification and application of carbon materials, in particular to a preparation method of graphene conductive paper with controllable conductivity. Background technique [0002] Graphene is a two-dimensional carbon atom crystal with sp2 hybrid orbitals, a single layer of atomically thick graphite, with a two-dimensional honeycomb grid structure, and is currently the thinnest material in the world. Graphene has excellent electrical, thermal and mechanical properties, and its electron mobility can reach 200,000 cm at room temperature. 2 V -1 S -1 , which is hundreds of times that of traditional semiconductor silicon materials, with a thermal conductivity of 5,000W m -1 K -1 , Young's modulus up to 1100Gpa, specific surface area up to 2,630m 2 g -1 , In addition, there are some special conduction phenomena, such as the quantum Hall effect. Among the many properties of graphene, conductivity is undoubtedly the ...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01B13/00C01B32/184C01B32/194
Inventor 刘敬权潘东晓崔亮
Owner QINGDAO HUAGAO GRAPHENE CORP LTD
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