Method for producing graphene belts in controllable macroscopic quantity by chemically cutting grapheme

A graphene ribbon and ene macro-quantity technology, which is applied in the field of chemically tailoring graphene macro-controllable graphene ribbons, graphene ribbons with controllable boundaries, macro-preparation layers, and width, can solve the problem of low yield, The number of layers and width of graphene ribbons are difficult to control, etc., to achieve the effects of high product yield, low cost and good controllability

Active Publication Date: 2011-04-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the lack of in-depth understanding of the control mechanism for the preparation of graphene ribbons by this method, the yield is very low (<0.5%), and the product is a mixture of graphene and graphene ribbons, and the number of layers and width of graphene ribbons are also difficult. control

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  • Method for producing graphene belts in controllable macroscopic quantity by chemically cutting grapheme
  • Method for producing graphene belts in controllable macroscopic quantity by chemically cutting grapheme
  • Method for producing graphene belts in controllable macroscopic quantity by chemically cutting grapheme

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Embodiment 1

[0027]Adopt Hummers method ["Hummers method " please refer to literature: Hummers W, Offman R.Jumal of The American Chemical Society 1958,80:1339.], take the artificial graphite powder of size<30 μ m as raw material (in this embodiment, be 20 μ m) Graphite oxide was prepared by oxidation at 35°C for 2h; the tube furnace was heated to 1050°C at a heating rate of 35°C / s, and the graphite oxide sample was quickly pushed to the tube under the protection of argon (flow rate 200ml / min) atmosphere. The rapid expansion and peeling was carried out in the high temperature zone of the type furnace, and the holding time was 30s; then, the sample was transferred to the low temperature zone, and reduced for 2 hours in a reducing atmosphere of hydrogen (100 ml / min) + argon (100 ml / min) at 450 ° C; 40 Ultrasonic dispersion in a water bath in N-methylpyrrolidone for 2 hours at ℃, with an ultrasonic power of 300W; use high-speed centrifugation at 10,000 rpm to remove graphite and thick graphite ...

Embodiment 2

[0030] Using the Hummers method, the artificial graphite powder with a size of <30 μm is used as a raw material (20 μm in this example), and is oxidized at 30° C. for 5 h to obtain graphite oxide; the tube furnace is heated to 1100° C. at a heating rate of 50° C. / s. Under the protection of a gas (flow rate of 200 ml / min) atmosphere, the graphite oxide sample was quickly moved to the high temperature zone of the tube furnace for rapid heating and expansion stripping, and the holding time was 30s, and then the sample was transferred to the low temperature zone; at 450 ° C, hydrogen (100 ml / min min) + argon (100 ml / min) in a reducing atmosphere for 2 hours; ultrasonically disperse in a water bath in N-methylpyrrolidone for 2 hours at room temperature, with an ultrasonic power of 300W; use 10,000 rpm high-speed centrifugation to remove the incompletely stripped Graphite and thick graphite flakes, obtained graphene after suction filtration; Graphene containing line defect is dispers...

Embodiment 3

[0033] Using the Hummers method, flake graphite powder with a size of <30 μm is used as raw material (20 μm in this example), and oxidized at 40° C. for 10 h to prepare graphite oxide; the tube furnace is heated to 1000° C. at a heating rate of 50° C. / s. (flow velocity 200 milliliters / min) under the protection of atmosphere, the graphite oxide sample is quickly pushed to the high temperature zone of the tube furnace for rapid heating and expansion stripping, and the holding time is 30s, and then the sample is transferred to the low temperature zone; ) + argon (150 ml / min) in a reducing atmosphere for 3 hours; ultrasonically disperse in a water bath in N-methylpyrrolidone for 2 hours at 40°C, with an ultrasonic power of 200W; use 12,000 rpm high-speed centrifugation to remove the incompletely stripped Graphite and thick graphite flakes obtain graphene after suction filtration; Graphene containing line defects is dispersed in polyvinylpyrrolidone (PVP) containing 0.1wt% and sodiu...

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Abstract

The invention relates to a technology for producing graphene belts, in particular to a method for producing graphene belts in controllable macroscopic quantity by chemically cutting grapheme. The method comprises the following steps of: firstly obtaining oxidized graphite in a Hummers method, selectively finishing line defects on the surface of the oxidized graphite by utilizing the oxygen-containing functional group in the process of oxidizing the graphite, and producing grapheme with surface line defects by combining high-temperature rapid expansion and peeling, thermal reduction, solvent dispersion and centrifugal separation; then cutting the graphene and recovering the structure of the graphene by utilizing ultrasonic shearing and chemical reduction; and finally removing large pieces of incompletely cut grapheme in a high-speed centrifuging method to further produce the graphene belt with controllable layer number and width. The method can be used for producing the graphene belt with controllable layer number, width and boundary by controlling the key cutting process parameters, such as graphite raw material variety, oxidization process, peeling process, reduction process, dispersion process and centrifugal treatment process, and the method is easy to operate and has low cost.

Description

Technical field: [0001] The invention relates to a preparation technology of graphene ribbons, in particular to a method for chemically cutting graphene to prepare graphene ribbons in a macro-controllable manner, which is suitable for the macro-scale preparation of graphene ribbons with controllable layers, widths, and boundaries. Background technique: [0002] Graphene refers to a single layer of carbon atoms tightly packed into a two-dimensional honeycomb structure. It is the basic unit for constructing other dimensional carbon materials (such as zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite). Graphene-based electronic devices are considered to be one of the most important potential applications of graphene due to the ultra-high carrier mobility, room-temperature submicron-scale ballistic transport properties, and THz frequency operation characteristics, which are expected to be the basis for carbon-based electric field effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 成会明任文才吴忠帅高力波刘碧录赵金平
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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