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Preparation method for graphene-containing nanopaper

A technology of graphene and nano paper, which is applied in the field of material science, can solve the problems of low degree of graphitization, achieve the effects of improving wave absorption characteristics, increasing loss rate, and reducing surface reflection ability

Inactive Publication Date: 2012-01-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of crystal structure, some carbon nanofibers have a high degree of crystallization and few defects; but some carbon nanofibers have a very low degree of graphitization, even close to an amorphous state.

Method used

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  • Preparation method for graphene-containing nanopaper
  • Preparation method for graphene-containing nanopaper
  • Preparation method for graphene-containing nanopaper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Combining figure 1 , a method for preparing nano paper containing graphene in the present invention,

[0022] Proceed as follows:

[0023] Step 1: Weigh 30g of natural flake graphite with a particle size of ≤45μm as raw material, dry it in an oven at 80°C for 24 hours, and prepare 30ml of concentrated H 2 SO 4 , 10g K 2 S 2 o 8 , 10g P 2 o 5 After mixing evenly, place it in a flask, add 30g of dried graphite into the flask, and heat to 80°C for oxidation reaction;

[0024] Step 2: oxidizing the natural flake graphite treated in step 1 by the Humers method to obtain graphite oxide;

[0025] Step 3: Add the graphite oxide obtained in Step 2 into the mixed solution of N, N-dimethylformamide and water, then treat it at 100W ultrasonic power for 3h, centrifuge at a speed of 4000r.p.m. for 40min, and transfer Remove the centrifuged precipitate to obtain a graphene oxide dispersion;

[0026] Step 4: After the graphene oxide dispersion obtained in step 3 is...

Embodiment 2

[0031] Example 2: Combining figure 2 , the preparation of reduced graphene oxide:

[0032] Weigh 30 g of natural flake graphite with a particle size of ≤45 μm as a raw material, and dry it in an oven at 80° C. for 24 hours before use. 30mL H 2 SO 4 , 10gK 2 S 2 o 8 , 10gP 2 o 5 The mixture is placed in a flask, and 30g of the above-mentioned dried natural graphite is added. Heat to 80°C, stop heating when the reactant completely turns blue-black, cool to room temperature and let stand for 6h. Rinse thoroughly with water and filter the reactant until the filtrate is neutral. Drying at room temperature, the product after drying in the previous step was mixed with concentrated H 2 SO 4 Slowly add KMnO in a water bath at 0°C 4 , control the temperature and slowly add distilled water to the flask to maintain the reaction for a period of time. Finally, add distilled water and H 2 o 2, the mixture turned from tan to bright yellow. Wash and filter the above reaction p...

Embodiment 3

[0033] Embodiment 3: the preparation that contains graphene nano paper:

[0034] Weigh 1.8g of carbon nanofibers, add deionized water, and the mass ratio of deionized water to carbon nanofibers is 100:1 to obtain a suspension. The suspension is mechanically stirred for 15 minutes, and then mixed under the condition of an ultrasonic frequency of 30Hz. Ultrasonic dispersion of the liquid for 40 minutes to form a uniformly distributed suspension, then arrange the pressure vessel, lay the ultra-fine filter membrane flat on the filter sieve, add a small amount of water to moisten, seal the pressure vessel, and put the suspension after ultrasonic treatment Transfer to a pressure vessel, and pressurize the suspension in the solution through an air compressor. When there is no large amount of water in the vessel, take out the wet filter membrane and the nano-paper on it, and carefully transfer it to a drying box. The drying temperature is From 100°C to 1300°C, the initial heating rate...

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Abstract

The invention provides a preparation method for graphene-containing nanopaper. The preparation method comprises the following steps of: taking 30g of natural crystalline flake graphite with particle diameter of less than or equal to 45 mum as a raw material; uniformly mixing 30ml of H2SO4, 10g of K2S2O8 and 10g of P2O5 and then filling in a flask; heating to 80 DEG C; then adding 20g of dried natural flake graphite with particle diameter of less than or equal to 45 mum into the flask; heating to 80 DEG C to perform oxidation reaction; oxidizing the graphite by using a humers method to obtain oxidized graphite; mixing the graphite and carbon nanofiber in mass fraction ratio of 1:2; pressurizing suspension to obtain a wet thin film; and drying to obtain dry and complete nanopaper. The conductivity of the nanopaper is about three times improved than that of the original normal nanopaper; the loss rate of the nanopaper material can be increased due to the addition of the graphene; the maximum loss of the pure carbon nanofiber nanopaper is 94.1 percent, and the wave absorption peak value reaches 12dB; and the maximum loss rate of the nanopaper after the addition of the graphene is 96.5 percent, and the wave absorption peak value reaches 13dB.

Description

(1) Technical field [0001] The invention relates to material science, in particular to a method for preparing nanometer paper containing graphene. (2) Background technology [0002] "Graphene", also known as "single-layer graphite sheet", refers to a dense layer of carbon atoms wrapped in a honeycomb crystal lattice. The carbon atoms are arranged in a two-dimensional structure, similar to the single atomic layer of graphite. Geim, a professor of physics at the University of Manchester in the United Kingdom, used a nano-sized gold "scaffold" to first manufacture a single-layer graphene film suspended on it, and found that the suspended graphene film was not a "two-dimensional flat structure", but It has a "microwave-like single-layer structure", and attributes the stability of the graphene single-layer structure to its "microscopic distortion at the nanoscale". Graphene can be decomposed into zero-dimensional fullerene, curled to form one-dimensional carbon nanotubes, and su...

Claims

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Application Information

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IPC IPC(8): D21H13/50
Inventor 刘彦菊刘忠羽吴春霞冷劲松
Owner HARBIN INST OF TECH
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