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Preparation method of graphene-titanium dioxide composite material

A composite material, titanium dioxide technology, applied in the directions of titanium dioxide, graphene, titanium oxide/hydroxide, etc., can solve the problems of difficult control of product size, uneven thickness of graphene film, and inability to meet industrial production, and achieve excellent electrical properties. Chemical properties, scale up preparation, and ensure the effect of reuse

Active Publication Date: 2013-10-02
大正(江苏)微纳科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Micromechanical exfoliation method, but the size of the prepared product is not easy to control and cannot meet industrial production
[0005] 2) Orientation epitaxy method, but the thickness of the graphene film obtained by this method is not uniform, and there are big problems in the adhesion between it and the substrate
[0006] 3) Chemical vapor deposition method, complex process, high cost and other factors limit its development
[0007] 4) Epitaxial growth method, harsh growth conditions limit its large-scale preparation ([3] Chen Wenquan. Preparation and performance research based on graphite bee nano-photocatalytic composite materials [D]. Xinyang Normal University Theoretical Physics, 2011)

Method used

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  • Preparation method of graphene-titanium dioxide composite material

Examples

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Embodiment 1

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific steps. Embodiment 1 mainly describes the reduction of pure graphene oxide film by hydrothermal vapor phase method.

[0026] Step 1, the preparation of graphene oxide

[0027] First prepare graphene oxide according to prior art, and its preparation method is as follows:

[0028] Get 0.5g graphite powder (Bay carbon, SP-1), 0.5g sodium nitrate (NaNO 3 ), 23ml sulfuric acid (H 2 SO 4 ) Stir in an ice bath; slowly add 3g of potassium permanganate (KMnO 4 ), and mix thoroughly for 1.5h in an ice bath environment. After mixing completely, transfer to a 35±5°C environment and stir for about 1 hour. Transfer the sample to an environment of 90±5°C, add 40ml of water, and stir for 30min. Maintain ambient temperature, add 100ml of water, then slowly add 3ml of 30% hydrogen peroxide (H 2 o 2 ), the color of the solution changed from dark brown to yello...

Embodiment 2

[0038]This embodiment mainly describes the hydrothermal vapor phase preparation method of graphene oxide / titanium oxide composite material, including the following steps:

[0039] Step 1 is the same as in Example 1.

[0040] Step 2. Hydrothermal Vapor Phase Reduction of Graphene and Titanium Oxide Composite Films

[0041] 1. Dissolve 0.74ml of tetraisopropyl titanate in 30ml of absolute ethanol and stir for 5 minutes to make solution A; add 357μL of deionized water and 14.1μL of concentrated nitric acid to 30ml of absolute ethanol to make solution B; Stir solution B, drop solution A into it, and stir to form a uniform solution C.

[0042] 2. Take 3ml of the graphene oxide solution prepared in step 1 and pour it into solution C, and stir thoroughly for 12 hours to obtain a uniform solution D.

[0043] 3. Centrifuge solution D at 10,000 rpm for 15 minutes, scrape off the sediment and apply it on a glass slide ( figure 1 4) above.

[0044] 4. Put the glass sheet into a 40ml a...

Embodiment 3

[0046] The steps are the same as in Example 2, except that the volume of the graphene oxide solution added in the second small step in step two is changed to 12ml.

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Abstract

The invention discloses a preparation method of a graphene-titanium dioxide composite material, and relates to the graphene-titanium dioxide composite material. The preparation method of the graphene-titanium dioxide composite material is high-efficient and environment-friendly, and comprises following steps: 1) preparing a solution by dissolving a titanium iron-containing precursor into absolute ethyl alcohol, and adding oxidized graphene solution, so that titanium irons are adsorbed by the surface of oxidized grapheme, hydrolyzation is performed, and amorphous titanium hydroxide nano-particles are obtained; precipitating and drying an obtained oxidized graphene-titanium hydroxide composite material so as to obtain a oxidized graphene-amorphous titanium oxide composite material; 2) adding an aqueous solution into a sealed high-pressure hydrothermal reaction vessel, adding the oxidized graphene-amorphous titanium oxide composite material which is obtained in step 1) on the aqueous solution, and performing reduction reaction of oxidized graphene and crystallization reaction of amorphous titanium oxide so as to obtain the graphene-titanium dioxide composite material.

Description

technical field [0001] The invention relates to a composite material of graphene and titanium dioxide, in particular to a method for preparing the composite material of graphene and titanium dioxide. Background technique [0002] With the development of society and economy, the research and development of high-performance lithium-ion batteries has attracted more and more attention. In terms of lithium-ion battery anode materials, graphite-based carbon materials have the possibility of becoming an ideal charge-discharge platform with high cost performance due to their good cycle stability, but the charge-discharge specific capacity of carbon-based materials is low, which cannot meet high Therefore, there is an urgent need to develop new negative electrode materials. In the research of new negative electrode materials, graphene, as an ultra-thin two-dimensional nanomaterial, has attracted much attention due to its special planar structure, stable electrical cycle performance ...

Claims

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Application Information

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IPC IPC(8): H01M4/36C01G23/053C01B31/04C01B32/184
CPCY02E60/10
Inventor 李鑫周涵琦李洋陈宏宋站雨
Owner 大正(江苏)微纳科技有限公司
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