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Method of improving chemical activity of carbon nano-tube

A technology of carbon nanotubes and chemical activity, applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of limited improvement in the chemical activity of carbon nanotubes, complicated operation, and inflexible control, etc., to achieve the complete removal of metal particles , Strong oxidation selectivity, good purification effect

Inactive Publication Date: 2008-01-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the processing method of carbon nanotubes is mainly chemical oxidation method, the most commonly used is high concentration strong acid oxidation method (such as Chinese patent CN1613755, CN1733602), cyano substitution method (such as Chinese patent CN1587031) and high temperature calcination method (such as Chinese patent CN1436722, CN1277148), high-concentration strong acid oxidation method can significantly improve the chemical activity of carbon nanotubes, but high-concentration strong acid generally has very strong corrosiveness, operation has certain danger, and needs to consume a large amount of strong acid, expensive and easy Cause environmental pollution; although the cyano group substitution method can control the number of carboxyl groups on the surface of carbon nanotubes, the operation is more complicated, the control is not flexible enough, and it needs to use azo substances containing cyano groups, which is easy to pollute the environment; the high temperature calcination method requires higher temperature, the improvement of the chemical activity of carbon nanotubes is also relatively limited
[0005] In conclusion, the chemical oxidation method relies on the oxidant to spontaneously oxidize carbon nanotubes, and its process control is not flexible enough, which is not conducive to mass production of purified carbon nanotubes for different purposes, the yield is low, and the production cost is high

Method used

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  • Method of improving chemical activity of carbon nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use cellulose membrane as the carbon nanotube support membrane, cut it into a rectangle of 1cm×3cm, wear a 50mm×0.1mm platinum wire on it, one end is in direct contact with the carbon nanotube, and the other end sticks out of the cellulose membrane , as a wire; take 0.2g of single-walled carbon nanotubes, mix them into a paste with 0.5mL of ultrapure water, and evenly spread it on the surface of the cellulose membrane, cover it with platinum wires, and the thickness of the carbon nanotube layer is about 0.5mm. (25°C) and dried for 3 hours to make anode I.

[0025] Add 1.0mol / L KCl solution into the constant potential electrolytic cell as the electrolyte, place the anode I in the constant potential electrolytic cell, and the carbon nanotube film is completely submerged below the liquid surface. The platinum sheet electrode was used as the cathode, the saturated calomel electrode was used as the reference electrode, the anode potential was set to 2.00V, and the constant p...

Embodiment 2

[0027] Use polyethylene film as the carbon nanotube support film, cut it into a rectangle of 2cm×10cm, wear a 150mm×0.1mm platinum wire on it, one end is in direct contact with the carbon nanotube, and the other end extends out of the polyethylene film , as a wire; take 3.0g of double-walled carbon nanotubes, mix them into a paste with 3.0mL N,N-dimethylformamide, apply it evenly on the surface of polyethylene film, cover the bottom with platinum wire, and the thickness of the carbon nanotube layer is About 1.2mm, dried in an oven at 60°C for 2 hours to make anode II.

[0028] Add 2.0mol / LNH to the constant potential electrolytic cell 4 Cl solution is used as the electrolyte, and the anode II is placed in the constant potential electrolytic cell, and the carbon nanotube film is completely submerged below the liquid surface. The platinum sheet electrode was used as the cathode, the saturated calomel electrode was used as the reference electrode, the anode potential was set to ...

Embodiment 3

[0030] Teflon film is used as the carbon nanotube support film, which is cut into a square of 10cm×10cm, and a 150mm×0.1mm platinum wire is passed through the middle of the film, one end is in direct contact with the carbon nanotube, and the other end extends out of the Teflon film as Wire: take 5.0g of multi-walled carbon nanotubes, mix them with 3.0mL of carbon tetrachloride to form a paste, evenly spread it on the surface of the Teflon film, cover it with platinum wire, the thickness of the carbon nanotube layer is about 2.0mm, and put it in an oven at 80°C Dry in medium for 2h to make anode III.

[0031] Add 2.5mol / L NaCl solution into the constant potential electrolytic cell as the electrolyte, place 10 anodes III in parallel in the constant potential electrolytic cell, and the carbon nanotube film is completely submerged below the liquid surface. The platinum sheet electrode was used as the cathode, the saturated calomel electrode was used as the reference electrode, the...

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Abstract

The invention designs a method which can change the appearance of the carbon nanotubes and the surface functional groups through electrooxidation to improve the chemical activity. By adopting the organic supporting membrane, the carbon nanotubes are prepared into membrane with thickness of 0.2mm to 5mm, which is connected with platinum wire as anode; a platinum sheet is used as cathode; chloride solution is used as electrolytic solution; a potentiostat is used to control the open potential in 1.50V to 2.5V (relative to saturated calomel electrode) to carry out constant potential electrolysis in three-electrode electrolytic cell. The electrolytic oxidation treatment process is controllable with low cost and light pollution. The invention has good purification effect on the carbon nanotubes and the chemical activity of the carbon nanotubes after oxidation treatment is obviously improved.

Description

field of invention [0001] The invention relates to a method for purifying and surface modifying carbon nanotubes, in particular to a method for changing the morphology and surface functional groups of carbon nanotubes through constant potential electrolysis to improve their chemical activity. Background technique [0002] Carbon nanotubes are one-dimensional quantum materials whose radial dimensions are on the order of nanometers, and whose axial dimensions are on the order of micrometers. Both ends of the tube are basically sealed. It is mainly composed of carbon atoms arranged in hexagons to form one or more layers of coaxial tubes, with a diameter of no more than 100nm. Due to its unique structure, the study of carbon nanotubes has great theoretical significance and potential application value, such as: electrochemical catalysis, molecular wires, nano-semiconductor materials, catalyst supports, molecular absorbers, micro-molds and near-field emission materials, etc. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00
Inventor 刘晨明曹宏斌李玉平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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