Preparation methods and applications of multilayer graphene and multilayer graphene modified electrode

A technology of multi-layer graphene and modified electrodes, applied in the direction of graphene, material electrochemical variables, nano-carbon, etc., can solve the problem of small specific surface area, achieve large specific surface area, high detection sensitivity, and high electron transfer rate.

Inactive Publication Date: 2013-02-06
SHANGHAI CHENGYING NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of graphene is mainly obtained by the graphite oxide method, but the obtained graphene is usually not a single-layer graphene, but is actually some graphite microchips with 10-100 layers, the specific surface area is small, and it is difficult to obtain it in the electric current. Playing the role of graphene's high specific surface area in chemical and biological detection
So far, no reports have been found on the direct use of multilayer graphene modified electrode materials made of multilayer carbon nanotubes and applied to biological detection.

Method used

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  • Preparation methods and applications of multilayer graphene and multilayer graphene modified electrode
  • Preparation methods and applications of multilayer graphene and multilayer graphene modified electrode
  • Preparation methods and applications of multilayer graphene and multilayer graphene modified electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put 50g of concentrated sulfuric acid, 10g of potassium permanganate and 1g of multi-walled carbon nanotubes (with a purity of more than 90%) between 20 and 30 layers into a 150ml three-necked bottle and place it in a constant temperature water bath at 80°C. The stirring rate is After stirring at 500rpm for 12h, pour the mixed solution into deionized water containing hydrogen peroxide (the content of hydrogen peroxide in the total weight is 2wt%), vacuum filter and wash until neutral, and dry in a vacuum oven at 60°C After 24 hours, the multi-layer graphene powder with layers between 20 and 30 can be obtained; since the distance between the walls of multi-walled carbon nanotubes is about 0.34nm, and as the number of layers increases, there are The greater the gravitational force, the more obvious the shielding effect and the less likely it is to be opened. Therefore, for carbon nanotubes with more layers, the higher the ratio of concentrated sulfuric acid and potassium p...

Embodiment 2

[0047] Put 50g of concentrated sulfuric acid, 5g of potassium permanganate and 2g of multi-walled carbon nanotubes (with a purity of more than 90%) between 10 and 20 layers into a 150ml three-necked bottle and place it in a constant temperature water bath at 50°C. The stirring rate is After stirring at 800rpm for 10h, pour the mixed solution into deionized water containing hydrogen peroxide (the content of hydrogen peroxide in the total weight is 5wt%), vacuum filter and wash until neutral, and dry in a vacuum oven at 60°C After 24 hours, multi-layer graphene powder with layers between 10 and 20 can be obtained;

[0048] Take 10 mg of the obtained multi-layer graphene powder and disperse it in 10 ml of dimethylformamide, place it in an ultrasonic instrument with a power of 30 W for 7 hours to obtain a uniformly dispersed dispersion, and use a micro-sampler to draw 5 μl of the dispersion and drop-coat it on Dry the surface of the glassy carbon electrode under an infrared lamp w...

Embodiment 3

[0052] Add 50g of concentrated sulfuric acid, 10g of potassium permanganate and 0.1g of multi-walled carbon nanotubes (with a purity of more than 90%) between 40 and 60 layers into a 150ml three-necked bottle and place it in a constant temperature water bath at 90°C. After stirring for 5 hours at 1200rpm, pour the mixed solution into deionized water containing hydrogen peroxide (the content of hydrogen peroxide in the total weight is 10wt%), vacuum filter and wash until neutral, and put it in a vacuum drying oven at 60°C After drying for 24 hours, a multilayer graphene powder with layers between 40 and 60 can be obtained;

[0053] Take 1mg of the obtained multi-layer graphene powder and disperse it in 10ml of ethanol, place it in an ultrasonic instrument with a power of 50W for 10h to obtain a uniformly dispersed dispersion, and use a micro-sampler to draw 5μl of the dispersion and drop-coat it on the glassy carbon electrode The surface is dried under an infrared lamp with a w...

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Abstract

The invention discloses preparation methods and applications of multilayer graphene and a multilayer graphene modified electrode. The preparation method of the multilayer graphene comprises the following steps of: uniformly mixing a multi-walled carbon nanotube, concentrated sulfuric acid and potassium permanganate, and placing the mixture into a constant-temperature water bath to uniformly stir, then, filtering in vacuum and cleaning with deionized water containing hydrogen peroxide to be neutral, and drying in vacuum at the temperature of 60-80 DEG C to obtain the multilayer graphene. The preparation method of the multilayer graphene modified electrode comprises the following steps of: adding the multilayer graphene into a dispersion liquid to carry out ultrasonic dispersion, dropwise coating the dispersion liquid of the dispersed multilayer grapheme on the surface of the electrode, and drying to obtain the multilayer graphene modified electrode. Compared with the prior art, the multilayer graphene modified electrode obtained by using the preparation method provided by the invention has high special surface area, multiple reaction active groups modified on the surface, high electron transfer speed and high-sensitivity detection performance for dopamine, tea polyphenols, threonine and tyrosine.

Description

technical field [0001] The invention relates to the field of electrochemical biological detection, in particular to a preparation method of multilayer graphene and a modified electrode thereof and an application in electrochemical biological detection. Background technique [0002] Electrochemical biomonitoring and detection, as a technical means with rapid response and timely feedback, is constantly being used in harmful gas monitoring, highly sensitive biomolecular detection, clinical medicine and genetic research, and with the development of nano-material technology It has been paid more and more attention to and researched by the majority of scientific researchers. In electrochemical biological detection, the conductivity, effective working specific surface area and working stability of the electrochemical working electrode determine its detection limit and detection sensitivity in the application. Ordinary glassy carbon electrode is a commonly used electrochemical work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04G01N27/30G01N27/48C01B32/19
Inventor 虞明东夏炳忠陈超吴小娟
Owner SHANGHAI CHENGYING NEW MATERIALS
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