Oxidized graphite flake layer/polyaniline composite material and method for preparing the same

A composite material and graphite sheet technology, which is applied in the field of graphite oxide sheet/polyaniline composite material and its preparation, can solve the performance gap of graphite oxide/polystyrene composite material, the comprehensive performance of the composite material is not high, and the weak bonding interface low cost, high yield, and short production cycle

Inactive Publication Date: 2009-07-29

NANJING UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

However, the performance of the graphite oxide/polystyrene composite material prepared by this method is still far from the requirements of the actual energy storage system.

In the existing method of preparing graphite oxide/polymer composite materials, the measures taken by researchers are to synthesize polymer materials under certain conditions first, and then add them to graphite oxide sheets. However, this method The disadvantage is that the weak bonding interface between the graphite oxide sheet and ...

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Method used

The transmission electron microscope figure of gained composite material is shown in Fig. 2 (A), as shown in the figure, the spherical polyaniline in composite material is wrapped by...

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Abstract

The invention relates to oxidized graphite sheet layer/polyaniline composite material and a preparation method thereof. The composite material is prepared by the following steps: the oxidized graphite is added into a dispersant for ultrasonic dispersion so as to form homodispersed single-sheet layer oxidized graphite mixed liquor; at the room temperature, aniline is added into the mixed liquor obtained in the first step drop by drop, and the ultrasonic dispersion is carried out to form the mixed liquor; a solution obtained by adding an oxidant into doping acid is dropwise added into the mixed liquor obtained in the second step for stirring and polymerization; the mixed liquor obtained in the third step is centrifugated, washed and dried in vacuum so as to obtain the oxidized graphite sheet layer/polyaniline composite material. The invention takes full advantages of big specific area of the oxidized graphite and surface oxygroup group to form binding sites and is organically combined with polyaniline skeleton by the chemical doping function of carboxylic acid group on the single-sheet layer of the oxidized graphite so as to form oxidized graphite/polyaniline complex; the operation process of preparing the product is simple, the production period thereof is short, the yield is high and the requirements on devices are low.

Technology Topic

Polyaniline compositeGraphite oxide +6

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Examples

Experimental program(5)

Example Embodiment

[0026] Embodiment 1: the method for preparing graphite oxide flake/polyaniline composite material of the present invention comprises the following steps:

[0027] The first step is the preparation of graphite oxide flakes. Add 10g of phosphorus pentoxide and 10g of potassium persulfate into 30mL of concentrated sulfuric acid at 80°C and stir for 30 minutes, take it out, react at room temperature for 6 hours, filter the product, wash to neutral and dry at room temperature to constant weight. Add the above product into 460mL of concentrated sulfuric acid at 0°C, stir and slowly add potassium permanganate, while controlling the temperature of the system not to exceed 15°C, stir evenly and raise the temperature to 35±3°C, continue stirring for a certain period of time, and then pour into the system Slowly add 1L of deionized water, control the temperature not to exceed 100°C, and continue stirring for 15min. Add 2.8L of deionized water and 50mL of 30% hydrogen peroxide. After stirring for 5 min, the resulting brown suspension was suction-filtered and dialyzed until there was no sulfate ion in the filtrate. Dry the product under vacuum at 60°C;

[0028] In the second step, 10 mg of graphite oxide is added to 50 mL of water or ethanol, and ultrasonicated for 20 to 120 min.

[0029] In the third step, the aniline monomer is added dropwise to the product of the second step, and ultrasonically dispersed for 10-60 minutes to form a mixed solution of 0.1 mol/L aniline.

[0030] The fourth step is to add 0.1 mol/L ammonium persulfate 0.5 mol/L hydrochloric acid solution 10mL dropwise to the system obtained in the third step at 0-5°C, and continue stirring for 2 hours, then raise the temperature to room temperature, and continue stirring for 2 hours .

[0031] The fifth step is to centrifuge and wash the above mixed solution, repeatedly wash with water and ethanol, and then vacuum-dry at 40° C. to obtain a graphite oxide single-sheet layer/nano-polyaniline composite material.

[0032] The transmission electron microscope image of the obtained composite material is shown in figure 2 (A), as shown in the figure, the spherical polyaniline in the composite material is wrapped by graphite oxide sheets, the particle size of polyaniline is uniform, and the average diameter is about 200nm, forming a polyaniline composite with well-attached graphite oxide sheet base things.

Example Embodiment

[0033] Embodiment 2: the method for preparing graphite oxide flake/polyaniline composite material of the present invention comprises the following steps:

[0034] The first step is the same as Step 1 in Example 1.

[0035] In the second step, add 1mg of graphite oxide into 50mL of water or ethanol, and sonicate for 20-120min.

[0036] In the third step, the aniline monomer is added dropwise to the product of the second step, and ultrasonically dispersed for 10-60 minutes to form a mixed solution of 0.2 mol/L aniline.

[0037] In the fourth step, add 10 mL of 0.1 mol/L sulfuric acid solution of 0.05 mol/L ammonium persulfate dropwise to the system obtained in the third step at 0-5°C, and continue stirring for 2 hours, then raise the temperature to room temperature, and continue stirring for 6 hours .

[0038] The fifth step is the same as step five in Example 1.

[0039] The transmission electron microscope image of the obtained composite material is shown in figure 2 (B), as shown in the figure, the nanofiber-shaped polyaniline in the composite material grows in the graphite oxide sheet, and the average diameter of the polyaniline fiber is about 100-200nm, forming a graphite oxide sheet base with good adhesion Polyaniline composite.

Example Embodiment

[0040] Embodiment 3: the method for preparing graphite oxide flake/polyaniline composite material of the present invention comprises the following steps:

[0041] The first step is the same as Step 1 in Example 1.

[0042] In the second step, add 1 mg of graphite oxide into 100 mL of water or ethanol, and sonicate for 20 to 120 min.

[0043]In the third step, the aniline monomer is added dropwise to the product of the second step, and ultrasonically dispersed for 10-60 minutes to form a mixed solution of 0.1 mol/L aniline.

[0044] In the fourth step, add 0.15mol/L FeCl dropwise to the system obtained in the third step at 0-5°C 3 Add 10 mL of 0.6 mol/L p-toluenesulfonic acid solution, and continue to stir for 4 h, warm up to room temperature, and continue to stir for 2 h.

[0045] The fifth step is the same as step five in Example 1.

[0046] The transmission electron microscope image of the obtained composite material is shown in figure 2 (C), as shown in the figure, the polyaniline in the composite material is in the form of sea cucumber, and the nanofibers on the surface grow closely with the graphite oxide sheets, forming a composite of graphite oxide sheets with a well-attached polyaniline nanofiber base thing.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Increase profit
Reduce agglomeration

Oxidized graphite flake layer/polyaniline composite material and method for preparing the same

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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