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Conversion method for converting single-walled carbon nano tube into double-walled carbon nano tube

A single-walled carbon nanotube, double-walled carbon nanotube technology, applied in the directions of carbon nanotubes, nanocarbons, chemical instruments and methods, can solve the problems of low yield, narrow diameter distribution, small yield, etc., to achieve high yield, The effect of narrow diameter distribution

Inactive Publication Date: 2020-07-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to obtain high-purity double-walled carbon nanotubes with narrow diameter distribution, fullerene / ferrocene-filled single-walled carbon nanotubes can be converted into multi-walled carbon nanotubes by heating below 1000 °C in vacuum, but this method It takes a long time and the output is small, and it is not suitable for small-diameter single-walled carbon nanotubes
[0005] Therefore, a conversion method for converting single-walled carbon nanotubes into double-walled carbon nanotubes has been developed to solve the problems of low yield and wide range of product diameters in the prior art. Defects have become a problem to be solved urgently by those skilled in the art

Method used

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  • Conversion method for converting single-walled carbon nano tube into double-walled carbon nano tube

Examples

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Embodiment 1

[0034] This example is a specific example of using single-walled carbon nanotubes with an average diameter of 1.1 nm to convert double-walled carbon nanotubes; in this example, the single-walled carbon nanotubes used are prepared from high-pressure carbon monoxide.

[0035] 20 mg of single-walled carbon nanotubes with an average diameter of 1.1 nm were dissolved in 20 ml of 37% hydrochloric acid solution and mixed, ultrasonically treated in a water bath for 12 minutes, and the ultrasonically completed solution was filtered using polytetrafluoroethylene with a pore size of 0.22 μm The membrane is filtered, and the filtered solution is washed three times with deionized water and rinsed once with ethanol with a concentration greater than 90%, and then dried to obtain purified single-walled carbon nanotubes.

[0036] Put the purified single-walled carbon nanotubes in an alumina boat, place the alumina boat as a whole in a high-temperature furnace, and then use a mechanical pump and...

Embodiment 2

[0040] This example is a specific example of using single-walled carbon nanotubes with an average diameter of 1.3 nm to convert double-walled carbon nanotubes; in this example, the single-walled carbon nanotubes used are prepared by pyrolysis.

[0041] 20 mg of single-walled carbon nanotubes with an average diameter of 1.3 nm are dissolved in 10 ml of 37% hydrochloric acid solution, left to soak for 20 hours, and the soaked solution is made of polytetrafluoroethylene with a pore size of 0.22 μm. filter the membrane, wash the filtered solution twice with deionized water and rinse once with ethanol with a concentration greater than 90%, and then dry to obtain purified single-walled carbon nanotubes.

[0042] Put the purified single-walled carbon nanotubes in an alumina boat, place the alumina boat as a whole in a high-temperature furnace, and then use a mechanical pump and / or a molecular pump to reduce the pressure of the high-temperature furnace to 10 -5 Pa, heat up to 1500°C a...

Embodiment 3

[0046] This embodiment is a specific embodiment of using single-walled carbon nanotubes with an average diameter of 1.4nm to convert double-walled carbon nanotubes; single-walled carbon nanotubes.

[0047] Place the single-walled carbon nanotubes in an alumina boat, place the alumina boat as a whole in a high-temperature furnace, and then use a mechanical pump and / or a molecular pump to reduce the pressure of the high-temperature furnace to 10 -3 Pa, heat up to 1440°C at a heating rate of 5°C / min, then heat-treat for 2 hours, and then cool down to room temperature at a cooling rate of 5°C / min to obtain double-walled carbon nanotube products.

[0048] Figure 4 In this example, the Raman spectrum characterization diagrams of carbon nanotubes before and after heat treatment, the corresponding Raman peak of the single-walled carbon nanotubes is located at about 170 wavenumbers, indicating that the diameter distribution of the single-walled carbon nanotubes is 1.46nm. Measure th...

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Abstract

The invention belongs to the field of carbon nano tube preparation technologies, and particularly relates to a conversion method for converting a single-walled carbon nano tube into a double-walled carbon nano tube. The invention provides a conversion method for converting a single-walled carbon nano tube into a double-walled carbon nano tube. The conversion method comprises the following steps: carrying out a heat treatment: under vacuum or in a protective atmosphere, heating single-walled carbon nano tubes, and cooling the single-walled carbon nano tubes to the room temperature to obtain double-walled carbon nano tubes; wherein the average diameter of the single-walled carbon nano tubes is 1.1 to 1.7 nm. The detection result shows that the prepared double-walled carbon nano tube is narrow in diameter distribution; and meanwhile, the prepared double-walled carbon nano tube has higher yield, stability and purity. The technical defects of low yield and wide diameter distribution range of a conversion method for producing double-walled carbon nano tubes are overcome.

Description

technical field [0001] The invention belongs to the field of carbon nanotube material preparation technology, and in particular relates to a conversion method for converting single-wall carbon nanotubes into double-wall carbon nanotubes. Background technique [0002] Double-walled carbon nanotubes combine the advantages of multi-walled carbon nanotubes and single-walled carbon nanotubes, for example, have good electrical conductivity, flexibility, and high specific surface area similar to single-walled carbon nanotubes, and have Good thermal stability and oxidation resistance. Compared with multi-walled carbon nanotubes and single-walled carbon nanotubes, double-walled carbon nanotubes not only overcome the problem of poor thermal stability of single-walled carbon nanotubes, but at the same time, the aspect ratio and specific surface area of ​​double-walled carbon nanotubes are also greater than Multi-walled carbon nanotubes with good flexibility. [0003] There are genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168
CPCC01B2202/04C01B2202/36C01B32/168
Inventor 石磊李璇杨国伟刘璞王建兴张一帆
Owner SUN YAT SEN UNIV
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