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Nanocellulose-assisted preparation method of high-content graphene flexible conductive composite membrane

A nanocellulose and ene flexible technology, applied in the field of graphene and nanocellulose, can solve the problems of low conductivity and low graphene content, and achieve the effect of high conductivity, good strength and controllable size

Inactive Publication Date: 2015-09-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only used for the purpose of obtaining a flexible transparent film, and its mechanical properties are high, but its graphene content is low, so its electrical conductivity is relatively low.

Method used

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  • Nanocellulose-assisted preparation method of high-content graphene flexible conductive composite membrane
  • Nanocellulose-assisted preparation method of high-content graphene flexible conductive composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 2 The graphene / nanocellulose composite film prepared in this embodiment is shown, wherein the nanocellulose is obtained by chemically hydrolyzing flax fibers. Add 0.02g of nanocellulose powder to an Erlenmeyer flask containing 20g of water, stir for 0.5h, and then ultrasonically treat it at 800W for 0.5h to obtain a dispersion of nanocellulose (such as figure 1 (Shown), then add 0.98g graphene powder, the mixed solution is ultrasonically treated at 100W power for 12h until the dispersion is uniform, then the mixed solution is slowly poured into a petri dish, and placed in a drying box at a temperature of 80 ℃ to dry When all the water is evaporated, the film is removed from the petri dish to obtain a composite film with a graphene content of 98 wt.%, and the electrical conductivity of the composite film is 198 S / cm.

Embodiment 2

[0027] In the graphene / nanocellulose composite film prepared in this embodiment, the nanocellulose is obtained by chemically hydrolyzing wood pulp fibers. Add 0.05g of nanocellulose powder into an Erlenmeyer flask containing 50g of water, stir for 0.5h and then ultrasonically treat for 0.5h at 800W power to obtain a dispersion of nanocellulose, then add 0.95g of graphene powder and stir. The mixed solution was subjected to ultrasonic treatment under 100W power for 10 hours, then slowly poured the mixed solution into a petri dish, and dried it in a drying box at a temperature of 60℃ until all the water was evaporated, and then peeled off the membrane from the petri dish to obtain The conductivity of the composite film with a graphene content of 95wt.% is 185S / cm.

Embodiment 3

[0029] In the graphene / nanocellulose composite film prepared in this embodiment, the nanocellulose is obtained by chemically hydrolyzing the husk fibers of Astragalus glabra. Add 0.1g of nano-cellulose powder into an Erlenmeyer flask containing 100g of water, stir for 12h and then ultrasonically treat for 12h at a power of 100W to obtain a dispersion of nanocellulose, then add 0.9g of graphene powder and stir the mixture After ultrasonic treatment at 800W power for 2h, then slowly pour the mixed solution into a petri dish, and place it in a drying oven at 40℃ to dry until all the water is evaporated, then peel off the film from the petri dish to obtain graphene The conductivity of the composite membrane with a content of 90wt.% is 169S / cm.

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Abstract

The invention aims to provide a nanocellulose-assisted preparation method of a high-content graphene flexible conductive composite membrane. The preparation method is characterized in that a low-content nanocellulose waterborne suspension is used to help disperse a graphene powder so as to obtain a uniform stable graphene / nanocellulose dispersion, and a flexible graphene composite membrane with graphene content up to 98 wt% and controllable mechanical property and conductivity can be prepared by a solvent evaporation method. The method is simple and low-cost, requires no complex equipment and is environmentally friendly. By the method, problems such as poor film-forming property of graphene, low strength, environmental pollution and the like existing in the prior art can be solved. In comparison with the prior art, the graphene membrane obtained by the method has advantages of good strength, controllable size and high conductivity.

Description

Technical field [0001] The invention relates to the field of graphene and nano cellulose, in particular to a conductive composite film with high mechanical strength and good flexibility by dispersing nano cellulose and assisting high-content graphene powder to form a conductive composite film. Background technique [0002] Graphene is a two-dimensional material with a hexagonal honeycomb lattice composed of carbon atoms and sp2 hybrid orbitals. Because of its excellent electrical, thermal and mechanical properties, it is expected to be used in nanoelectronic devices, transparent conductive films, composite materials, antistatic materials, energy storage materials, and inductors, etc., making it attract attention after carbon nanotubes New carbon materials. [0003] The unique properties of graphene make it very promising in the field of new flexible electronic components. Recently, graphene has been produced on a large scale in a few countries, hoping to develop its application a...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/02C08K3/04
Inventor 刘冬艳隋国鑫马娜林国明刘月月
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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