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A polymer-assisted separation method for large-diameter semiconducting single-walled carbon nanotubes

A single-walled carbon nanotube and semiconducting technology, which is applied in the field of polymer-assisted separation of large-diameter semiconducting single-walled carbon nanotubes, can solve problems such as difficult separation, achieve simple operation, good industrial application prospects, and less time-consuming Effect

Active Publication Date: 2022-08-09
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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  • A polymer-assisted separation method for large-diameter semiconducting single-walled carbon nanotubes
  • A polymer-assisted separation method for large-diameter semiconducting single-walled carbon nanotubes
  • A polymer-assisted separation method for 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. like figure 1 As shown, the infrared absorption spectrum shows that no C=O bond was detected in the samples before and after the treatment with the aqueous hydrogen peroxide solution, indicating that the oxidation of hydrogen peroxide to single-walled carbon nanotubes at room temperature is very weak.

[0039] like 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 content of carbon impurities in single-walled carbon nanotubes after hydrogen peroxide treatment is greatly reduced, indicating that hydrogen peroxide aqueous solution has a strong effect on amorphous carbon. and other impurities have a strong oxid...

Embodiment 2

[0045] 100 mg of large-diameter single-walled carbon nanotubes were treated by step (1), wherein the concentration of the aqueous hydrogen peroxide solution was analytically pure, and the treatment time was 72 h. The infrared absorption spectrum showed that no C=O bond was detected in the samples before and after the treatment with the aqueous solution of hydrogen peroxide, indicating that the oxidation of hydrogen peroxide to single-walled carbon nanotubes at room temperature was very weak. The thermogravimetric / differential thermal analysis curve shows that the content of carbon impurities in the single-walled carbon nanotubes is greatly reduced after hydrogen oxide treatment, indicating that the 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 samples decreased slightly compared with the pristine CNT samples, but w...

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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. First, large-diameter single-walled carbon nanotubes prepared by floating catalyst chemical vapor deposition (FCCVD) were pretreated with hydrogen peroxide to selectively functionalize the ports of carbon nanotubes while removing impurities such as amorphous carbon; The single-walled carbon nanotubes are modified by non-covalent bonds, and then ultrasonically dispersed and centrifuged to finally obtain a high-purity large-diameter semiconducting single-walled carbon nanotube solution. The invention combines the advantages of non-destructive purification, selective functionalization and conjugated polymer-assisted separation of large-diameter, high-quality single-walled carbon nanotubes grown by FCCVD method with hydrogen peroxide, and successfully realizes large-diameter semiconducting properties. The separation of single-walled carbon nanotubes is expected to be used in infrared detectors and radio frequency devices.

Description

technical field [0001] The invention relates to the field of liquid phase separation of semiconducting single-wall carbon nanotubes, in particular to a polymer-assisted separation method for large-diameter semiconducting single-wall carbon nanotubes. Background technique [0002] Carbon nanotubes can be regarded as hollow tubular structures formed by 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 . Furthermore, single-walled carbon nanotubes have unique electrical properties, namely structure-dependent metallicity or semiconducting property. The electrical structure of single-walled carbon nanotubes is determined by the way of curling of the graphene sheets that make up them, that is, the chirality index (n, m). When n-m=3j, single-walled carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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