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Method for reduction of graphene oxide by metal/tea polyphenol as reducing agent

A technology of tea polyphenols and reducing agents, which is applied in the field of metal/tea polyphenols as reducing agents to reduce graphene oxide, can solve the problems of long preparation period, complex process, high toxicity of reducing agents, etc., achieve good reducibility and improve electrical conductivity Performance, the effect of improving the reduction effect

Active Publication Date: 2014-10-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of high toxicity of the reducing agent, long preparation period and complicated process, and provides a method for reducing graphene oxide with metal / tea polyphenol as the reducing agent. The preparation process of the present invention is simple and has no special requirements for equipment, and Has a good restoration effect

Method used

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  • Method for reduction of graphene oxide by metal/tea polyphenol as reducing agent
  • Method for reduction of graphene oxide by metal/tea polyphenol as reducing agent

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Embodiment 1

[0022] Graphite oxide was prepared by the Hummers method, and 230ml of concentrated sulfuric acid with a mass fraction of 98% was slowly added to a 1000ml three-necked flask, and 10g of original graphite and 5g of NaNO 3 Slowly add concentrated sulfuric acid, stir at a low temperature of 5°C to ensure thorough mixing, and slowly add 30g KMnO in batches after 30 minutes 4 , reacted for 2 hours; then moved the three-necked flask into a 35°C water bath for medium-temperature reaction, and continued to stir for 30 minutes; slowly added 460ml of deionized water to the three-necked flask for dilution, and then moved the three-necked flask into a 95°C water bath for high-temperature reaction, and continued to stir for 30 minutes ; the reaction ends, the mixture is moved into the beaker and continues to add deionized water for dilution, adding 25ml mass fraction is 30% H 2 o 2 Solution, after washing several times with deionized water, add a little HCl solution with a mass fraction o...

Embodiment 2

[0025] Adopt the method for embodiment 1 to prepare 100ml concentration and be the graphene oxide dispersion liquid of 3mg / ml, add this solution into 250ml there-necked flask, then add 0.3g tea polyphenols and 1.2g aluminum sheet to the there-necked flask, the size of aluminum sheet is 0.5cm ×0.5cm×1mm, that is, the mass ratio of graphene oxide to tea polyphenols and aluminum is 1:1:4, put the three-neck flask in a water bath at 80°C for 2 hours; after the reaction is completed, the product is centrifugally washed and removed from the dispersion For excess tea polyphenols, remove the precipitate and place it in an oven at 105°C to dry to obtain graphene.

[0026] figure 2 Curve c in middle shows the XRD spectrum of graphene. After the reduction of tea polyphenols / aluminum flakes, the interlayer spacing of graphene is reduced from 0.834nm to 0.353nm, which is close to the original graphite interlayer spacing, indicating the removal of oxygen-containing groups. This proves the...

Embodiment 3

[0029] Adopt the method for embodiment 2 to prepare graphene, the difference is that the quality of aluminum sheet is changed from 1.2g to 0.3g, that is, the mass ratio of graphene oxide, tea polyphenols and aluminum is 1:1:1; As shown in Table 1, the square resistance of the graphene film has reached 279.67Ω / sq, which is 30.2% lower than that of Comparative Example 1, indicating that the addition of reducing aluminum flakes in the reducing system can improve the conductivity of graphene.

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Abstract

The invention discloses a method for reduction of graphene oxide by metal / tea polyphenol as a reducing agent. The method comprises the steps of: preparing graphite oxide by a Hummers method, placing the graphite oxide in water and dispersing a graphite oxide film and water uniformly by ultrasonic dispersion so as to obtain a dark brown graphene oxide dispersion solution; using tea polyphenol and metal as the reducing agent, and the reducing agent into the graphene oxide dispersion solution to undergo reduction reaction so as to obtain a stable graphene dispersion solution, and subjecting the product to centrifugal washing and drying, thus obtaining graphene. According to the invention, the reducing agent is green and pollution-free and has wide sources, and the preparation process is simple, safe and fast, and has a good reduction effect on graphene oxide. The prepared graphene has good electrical conductivity, is easy to popularize and use, and has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method in which metal / tea polyphenols are used as a reducing agent to reduce graphene oxide. Background technique [0002] Graphene refers to a single-layer graphite sheet, which is a single-atom-layer two-dimensional crystal material with a honeycomb structure formed by sp2 hybridization of carbon atoms. Due to its thermal conductivity, high optical transparency, electrical conductivity, mechanical properties, and high specific surface area In the past few years, graphene has received extensive attention from researchers around the world, and it is also known as one of the most amazing materials in the 21st century; since it was first discovered by Novoselov and Geim in 2004 through micromechanical exfoliation Since graphene, various methods such as chemical vapor deposition, epitaxial growth, cutting carbon nanotubes, liquid phase exfoliation and reduced graphene oxide have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 张宏伟南松楠
Owner SOUTH CHINA UNIV OF TECH
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