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Method for grafting polyvinylpyrrolidone onto surface of graphene
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A polyvinylpyrrolidone and graphene surface technology, applied in the field of preparation in the field of nanomaterial technology, can solve the problem of low yield of single-layer graphene, and achieve the effect of a rapid preparation method
Active Publication Date: 2012-04-25
上海碳源汇谷新材料科技有限公司
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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
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Embodiment 1
[0023] Such as figure 1 As shown, the preparation method described in this embodiment includes the following steps:
[0024] 1. At room temperature, weigh out 0.1g of laboratory-made graphite oxide and weigh out 200mlH 2 O was added to a 250ml three-necked flask, the working frequency was 40kHz, the ultrasonic power was 200w ultrasonic treatment for 30min, the graphite oxide was peeled off, and the graphene oxide dispersion liquid with a concentration of 0.5mg / ml was obtained.
[0025] 2. Weigh 1g of polyvinylpyrrolidone and add it to the graphene oxide dispersion, stir it fully for 10 minutes to dissolve it.
[0026] 3. Weigh 0.4g of ascorbic acid and add it to the above system, fully stir for 5min to dissolve it.
[0027] 4. Place 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 200mlH 2 O was added to a 250ml three-necked flask, and ultrasonic treatment was performed at a working frequency of 40kHz and an ultrasonic power of 200w 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 to the graphene oxide dispersion, stir it fully for 10 minutes to dissolve it.
[0031] 3. Measure 1ml of hydrazine hydrate and add it to the above system, stir it thoroughly for 5min to dissolve it.
[0032] 4. Place 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 200mlH 2 O was added to a 250ml three-necked flask, and the working frequency was 40kHz, the ultrasonic power was 200w ultrasonic treatment for 1h, the graphite oxide was peeled off, and the graphene oxide dispersion liquid with the concentration of 0.1mg / ml was obtained.
[0035] 2. Weigh out 0.04g of polyvinylpyrrolidone and add it to the graphene oxide dispersion, and stir it for 5 minutes to dissolve it.
[0036] 3. Weigh 0.02g ascorbic acid and add it to the above system, fully stir for 5min to dissolve it.
[0037] 4. Place 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] During the preparation process of graphene grafted with polyvinylpyrrolidone on the surface, the optimal dosage of polyvinylpyrrolidone was determined by adjusting the dosage of polyvinylpyrrolidone 10 to 1 / 10 times that of graphite oxide; i...
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Abstract
The invention discloses a method for graftingpolyvinylpyrrolidone onto the surface of graphene in the technical field of nanometer materials, which comprises the following steps: preparing tawny water solution of grapheneoxide; and sequentially adding the polyvinylpyrrolidone and a reducer into the water solution of grapheneoxide, 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 onto the surface of graphene. Background technique [0002] Graphene, a new type of single-layer two-dimensional nanomaterial with unique electrical, thermal and mechanical properties, is the most ideal substrate for preparing polymer composites. For example, Stankovich et al. published an article entitled "Graphene-based composite materials" in "Nature" (2006, 442, 282-285). The author uses isocyanate and oxidation The oxygen-containing groups of graphite can obtain chemically modified graphiteoxide which is stably dispersed in an organic solvent (N,N-dimethylformamide). After being blended with polyethylene, it is chemically reduced to obtain a polymer matrix A single-layer graphene composite uniformly dispersed in the medium, and has good electrical conductivity. Yu et al. published the title "Graphite nano...
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