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Method for preparing biocompatible graphene

A biocompatible and graphene technology, applied in the field of biocompatible graphene preparation, can solve the problems of high oxygen content in graphene, restriction of graphene, toxicity restriction promotion and application, etc.

Inactive Publication Date: 2011-04-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to the chemical exfoliation method is to find a suitable reducing agent. The currently used reducing agents mainly include hydrazine hydrate, p-phenylenediamine, etc. However, although these inorganic reducing agents can effectively reduce graphite oxide, their huge toxicity greatly limits promotion and application, and the graphene obtained at the same time cannot be stably dispersed in solvents such as water
In order to find a more effective and green reducing agent, Jiali Zhang et al. used ascorbic acid as a reducing agent to prepare graphene [JialiZhang et al., Chem.Commun., 2010, 46, 1112-1114], but the prepared graphene agglomerates Seriously, it will limit the superior characteristics of graphene itself. Subsequently, Chengzhou Zhu et al. prepared graphene with glucose reduction [Chengzhou Zhu et al., ACS Nano, 2010, 4(4), 2429], due to the poor reducibility of glucose , the prepared graphene has a higher oxygen content

Method used

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  • Method for preparing biocompatible graphene
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  • Method for preparing biocompatible graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 1g of natural graphite, 1g of sodium nitrate, and 46mL of concentrated sulfuric acid, mix them evenly and place them in an ice bath (0°C) and stir for 4 hours, then slowly add 6g of potassium permanganate to the reactant, Continue stirring for 2 hours at (25°C), slowly add 98mL of water to the reactant, then transfer the reactant to a 98°C water bath and stir for 15 minutes, add 200mL of warm water at 50°C and 20mL of hydrogen peroxide, and centrifuge with hydrochloric acid (8000°C) while hot RPM) washing once, water centrifugation (8000 RPM) washing three times, and finally the bright yellow precipitate was dried to obtain graphite oxide.

[0016] (2) 0.1g graphite oxide is put into 100mL water and ultrasonically dispersed to form a graphene oxide solution that is uniformly dispersed and the mass concentration is 1g / L. In the graphene oxide solution, dropwise adding mass concentration is 28% ammonia water to make the pH value Adjust to 10.0;

[0017] (3) Diss...

Embodiment 2

[0020] (1) prepare graphite oxide with the processing step identical with embodiment 1;

[0021] (2) 0.1g graphite oxide is put into 200mL water and ultrasonically dispersed to form a graphene oxide solution that is uniformly dispersed and the mass concentration is 0.5g / L. In the graphene oxide solution, dripping mass concentration is 28% ammonia water to make the pH Adjust the value to 10.0;

[0022] (3) Dissolving 0.1g glutathione in 50mL water to form an aqueous solution with a mass concentration of 2g / L;

[0023] (4) Mix the prepared graphene oxide solution and glutathione aqueous solution evenly, place the resulting mixed solution in an oil bath at 90°C and stir for 24 hours, after the reaction is complete, filter, wash and dry the mixture to obtain graphite alkene.

Embodiment 3

[0025] (1) prepare graphite oxide with the processing step identical with embodiment 1;

[0026] (2) 0.05g graphite oxide is put into 200mL water and ultrasonically dispersed to form a graphene oxide solution that is uniformly dispersed and the mass concentration is 0.25g / L. In the graphene oxide solution, dripping mass concentration is 28% ammoniacal liquor to make the pH Adjust the value to 10.0;

[0027] (3) Dissolving 0.05g glutathione in 25mL water to form an aqueous solution with a mass concentration of 2g / L;

[0028] (4) Mix the prepared graphene oxide solution and glutathione aqueous solution evenly, place the resulting mixed solution in an oil bath at 90°C and stir for 24 hours, after the reaction is complete, filter, wash and dry the mixture to obtain graphite alkene.

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Abstract

The invention discloses a method for preparing biocompatible graphite, comprising the steps of: ultrasonically dispersing prepared graphite oxide to obtain a graphene oxide solution, uniformly mixing the graphene oxide solution as well as sulfydryl-containing amino acid and a derivative thereof, placing the mixture in an oil bath for reaction for a certain time to obtain a graphene product, and carrying out vacuum filtration on the product to obtain the monolayer graphene with dispersion stability. The method has the advantages of simple technological conditions, no toxin and environmental-protection performance, and the prepared graphene can stably disperse in an aqueous solution, presents favorable biocompatibility, and has an excellent property when being used as a super capacitor electrode material.

Description

technical field [0001] The invention relates to a method for preparing biocompatible graphene, in particular to a method for obtaining graphene that can be stably dispersed in water by reducing graphite oxide with a biological reducing agent. Background technique [0002] Graphene is a new type of material in which carbon atoms are tightly packed into a hexagonal lattice structure in two-dimensional space, and is the basic unit of 1-dimensional carbon nanotubes, 0-dimensional fullerenes and graphite. Since Novoselov et al. used mechanical exfoliation of pyrolytic graphite to obtain independent graphene, due to its excellent mechanical and physical properties, it has quickly become a hot spot in material science research. At present, the research on graphene has been widely carried out in basic research, and there are further realizations. possibility of application. The methods for large-scale preparation of graphene include chemical exfoliation [D.Li et al., Nat Nanotech.,...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 张大成马衍伟张熊陈尧王长慧余鹏
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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