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Polymer-assisted separation method of large-diameter semiconducting single-walled carbon nanotubes

A single-walled carbon nanotube, semiconducting technology, applied in the field of polymer-assisted separation of large-diameter semiconducting single-walled carbon nanotubes, can solve problems such as separation difficulties, achieve simple operation, good industrial application prospects, and realize batch production The effect of production

Active Publication Date: 2021-01-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is that the difference in electronic structure and chemical properties of metallic and semiconducting single-walled carbon nanotubes decreases as the diameter increases, making it more difficult to separate the two.

Method used

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  • Polymer-assisted separation method of large-diameter semiconducting single-walled carbon nanotubes
  • Polymer-assisted separation method of large-diameter semiconducting single-walled carbon nanotubes
  • Polymer-assisted separation method of large-diameter semiconducting single-walled carbon nanotubes

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Embodiment 1

[0038] In this embodiment, step (1) is used to process 100 mg of large-diameter single-walled carbon nanotubes, wherein the concentration of the aqueous hydrogen peroxide solution is analytically pure, and the processing time is 72 hours. Such as figure 1 As shown, the infrared absorption spectrogram shows that no C=O bond is detected in the sample before and after the aqueous hydrogen peroxide treatment, indicating that hydrogen peroxide has very weak oxidation to single-walled carbon nanotubes at room temperature.

[0039] Such as figure 2 and image 3 As shown, the thermogravimetric / differential thermal analysis curves of single-walled carbon nanotubes before and after hydrogen peroxide treatment show that the contents of carbon impurities in single-walled carbon nanotubes are greatly reduced after hydrogen peroxide treatment, indicating that hydrogen peroxide aqueous solution has an effect on amorphous carbon. Other impurities have a strong oxidation effect.

[0040] S...

Embodiment 2

[0045] 100 mg of large-diameter single-walled carbon nanotubes were processed by step (1), wherein the concentration of the aqueous hydrogen peroxide solution was analytically pure, and the processing time was 72 hours. The infrared absorption spectrogram shows that no C=O bond is detected in the sample before and after the hydrogen peroxide aqueous solution treatment, indicating that hydrogen peroxide has very weak oxidation to single-walled carbon nanotubes at room temperature. The thermogravimetric / differential thermal analysis curve shows that the content of carbon impurities in single-walled carbon nanotubes is greatly reduced after hydrogen oxide treatment, indicating that hydrogen peroxide aqueous solution has a strong oxidation effect on impurities such as amorphous carbon; Raman spectroscopy shows that hydrogen peroxide After the aqueous solution treatment, the G / D ratio of the sample decreased slightly compared with the pristine CNT sample, but it was still as high as...

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Abstract

The invention relates to the field of liquid-phase separation of semiconducting single-walled carbon nanotubes, in particular to a polymer-assisted separation method of large-diameter semiconducting single-walled carbon nanotubes. The method comprises the following steps of: firstly, pretreating a large-diameter single-walled carbon nanotube prepared by a floating catalyst chemical vapor deposition method by utilizing hydrogen peroxide, and performing selective functionalization on a port of the carbon nanotube while removing impurities like amorphous carbon; carrying out non-covalent bond modification on the single-walled carbon nanotube by using a polymer, and carrying out ultrasonic dispersion and centrifugal treatment to finally obtain a high-purity large-diameter semiconducting single-walled carbon nanotube solution. The method provided by the invention combines the advantages of nondestructive purification and selective functionalization of hydrogen peroxide on large-diameter andhigh-quality single-walled carbon nanotubes grown by an FCCVD method and good selectivity of a conjugated polymer assisted separation method, successfully realizes separation of large-diameter semiconducting single-walled carbon nanotubes, and is expected to be applied to the fields of infrared detectors, radio frequency devices and the like.

Description

technical field [0001] The invention relates to the field of liquid phase separation of semiconducting single-walled carbon nanotubes, in particular to a polymer-assisted separation method for large-diameter semiconducting single-walled carbon nanotubes. Background technique [0002] Carbon nanotubes can be regarded as a hollow tubular structure formed by curling two-dimensional graphene sheets. Its unique one-dimensional structure endows carbon nanotubes with many excellent physical and chemical properties: the carrier mobility is as high as 10 5 cm 2 / (V s); thermal conductivity up to 3500W / (m K); carrier density up to 10 9 A / cm 2 . In addition, SWCNTs have unique electrical properties, that is, structure-dependent metallicity or semiconducting properties. The electrical structure of single-walled carbon nanotubes is determined by the curling mode of the graphene sheets that constitute it, that is, the chiral index (n,m). When n-m=3j, the single-wall carbon nanotube i...

Claims

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Application Information

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IPC IPC(8): C01B32/159C01B32/17
CPCC01B32/159C01B32/17C01B2202/02C01B2202/36C01B2202/34C01B2202/30Y02E10/549
Inventor 成会明谢飘侯鹏翔刘畅焦新宇石超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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