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Method for grafting polyvinylpyrrolidone onto surface of graphene

A polyvinylpyrrolidone and graphene surface technology, applied in the field of preparation of nanomaterials technology, can solve problems such as low yield of monolayer graphene, and achieve the effect of a rapid preparation method

Active Publication Date: 2010-09-15
上海碳源汇谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-quality graphene dispersions can be prepared using graphite as a starting material, but the yield of monolayer graphene is low

Method used

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  • Method for grafting polyvinylpyrrolidone onto surface of graphene
  • Method for grafting polyvinylpyrrolidone onto surface of graphene
  • Method for grafting polyvinylpyrrolidone onto surface of graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the preparation method described in this embodiment comprises the following steps:

[0024] 1. At room temperature, weigh 0.1g of laboratory-made graphite oxide and measure 200ml of H 2 O was added to a 250ml three-necked bottle, and the working frequency was 40kHz, and the ultrasonic power was 200w, and the ultrasonic treatment was performed for 30min to remove the graphite oxide and obtain a graphene oxide dispersion with a concentration of 0.5mg / ml.

[0025] 2. Weigh 1g of polyvinylpyrrolidone and add it into the graphene oxide dispersion, and then fully stir for 10 minutes to dissolve it.

[0026] 3. Weigh 0.4g of ascorbic acid and add it to the above system, stir it thoroughly for 5 minutes to dissolve it.

[0027] 4. Put the mixed system in an oil bath and heat it to 70°C. After fully reacting for 6 hours, a black uniform solution is obtained.

Embodiment 2

[0029] 1. At room temperature, weigh 0.2g of laboratory-made graphite oxide and measure 200ml of H 2 O was added to a 250ml three-necked bottle, and the working frequency was 40kHz, and the ultrasonic power was 200w, and the ultrasonic treatment was performed for 30min to remove the graphite oxide and obtain a graphene oxide dispersion with a concentration of 1mg / ml.

[0030] 2. Weigh 1g of polyvinylpyrrolidone and add it into the graphene oxide dispersion, and stir it fully for 10 minutes to dissolve it.

[0031] 3. Measure 1ml of hydrazine hydrate and add it to the above system, and stir thoroughly for 5 minutes to dissolve it.

[0032] 4. Put the mixed system in an oil bath and heat it to 80°C. After fully reacting for 4 hours, a black uniform solution is obtained.

Embodiment 3

[0034] 1. At room temperature, weigh 0.02g of laboratory-made graphite oxide and measure 200ml of H 2 O was added to a 250ml three-necked bottle, and the working frequency was 40kHz, and the ultrasonic power was 200w, and the ultrasonic treatment was performed for 1 hour to remove the graphite oxide and obtain a graphene oxide dispersion with a concentration of 0.1mg / ml.

[0035] 2. Weigh 0.04g of polyvinylpyrrolidone and add it into the graphene oxide dispersion, then fully stir for 5 minutes to dissolve it.

[0036] 3. Weigh 0.02g of ascorbic acid and add it to the above system, stir it thoroughly for 5 minutes to dissolve it.

[0037] 4. Put the mixed system in an oil bath and heat it to 90°C. After fully reacting for 2 hours, a black uniform solution is obtained.

[0038] In the preparation process of graphene grafted with polyvinylpyrrolidone on the surface, the optimal amount of polyvinylpyrrolidone was determined by adjusting the amount of polyvinylpyrrolidone to be 10...

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Abstract

The invention discloses a method for grafting polyvinylpyrrolidone onto the surface of graphene in the technical field of nanometer materials, which comprises the following steps: preparing tawny water solution of graphene oxide; and sequentially adding the polyvinylpyrrolidone and a reducer into the water solution of graphene oxide, fully stirring and dissolving the polyvinylpyrrolidone and the reducer, heating the mixed solution with oil bath for reaction, and after the reaction, obtaining the graphene of which the surface is grafted with the polyvinylpyrrolidone. The method comprises the simple steps and has the advantages of quickly realizing the preparation of graphene-based composite materials, obtaining the graphene-based composite materials mono-dispersed in the water solution by utilizing the high water-solubility of the polyvinylpyrrolidone, simultaneously realizing technology of spreading the graphene-based composite materials into films on substrates and laying the foundation for the application of the graphene-based composite materials in the fields of biomedicine and sensors and to research on the basic physical properties of the graphene.

Description

technical field [0001] The invention relates to a preparation method in the technical field of nanomaterials, in particular to a method for grafting polyvinylpyrrolidone on the surface of graphene. Background technique [0002] Graphene, a new single-layer two-dimensional nanomaterial, has unique electrical, thermal, and mechanical properties, and is the most ideal substrate for the preparation of polymer composites. For example, Stankovich et al. published an article entitled "Graphene-based composite materials" (graphene-based composite materials) in "Nature" (Nature) (2006, 442, 282-285). The author utilizes isocyanate and oxidation The oxygen-containing groups of graphite act to obtain chemically modified graphite oxide that is stably dispersed in organic solvents (N, N-dimethylformamide), blended with polyethylene, and chemically reduced to obtain a polymer matrix Uniformly dispersed single-layer graphene composites with good electrical conductivity. Yu et al publishe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L39/06C08K3/04C08F26/10C08F8/48C08F8/14
Inventor 郭守武张佳利沈广霞
Owner 上海碳源汇谷新材料科技有限公司
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