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Preparation method of single-walled carbon nanotubes with clean surface and no dispersant

A technology of single-walled carbon nanotubes and dispersants, applied in the direction of single-walled carbon nanotubes, carbon nanotubes, nanotechnology for materials and surface science, etc., can solve the impact of polymers, limited applications, and damage to carbon nanometers Intrinsic characteristics and other issues, to achieve the effect of low cost and easy decomposition

Active Publication Date: 2019-04-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

Bao Zhenan and others also designed a supramolecular polymer linked by hydrogen bonds. This structure can break the hydrogen bonds by adding some strong protonic acids, so as to realize the removal of the polymer from the surface of carbon nanotubes. However, the strong protonic acid Adding will also destroy the intrinsic properties of carbon nanotubes, making it limited for later applications
Moreover, the aforementioned methods are not simple and effective enough, especially these methods need to be implemented with the help of polymers. On the one hand, the limitations of the polymer structure will lead to low purity of the separated carbon nanotubes, and on the other hand, the polymers will be affected by the degree of polymerization. The impact is not conducive to the stability of the process

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  • Preparation method of single-walled carbon nanotubes with clean surface and no dispersant
  • Preparation method of single-walled carbon nanotubes with clean surface and no dispersant
  • Preparation method of single-walled carbon nanotubes with clean surface and no dispersant

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preparation example Construction

[0024] A method for preparing single-walled carbon nanotubes with clean surfaces and no dispersants provided by the embodiments of the present invention includes:

[0025] Uniformly mixing single-walled carbon nanotubes and nitrogen-heterocyclic aromatic small molecule compounds in a dispersion medium to form a dispersion solution,

[0026] separating the dispersed solution to form a solid phase part and a liquid phase part, the liquid phase part comprising enriched semiconductor-type single-walled carbon nanotubes combined with the nitrogen-heterocyclic aromatic small molecule compound,

[0027] Light treatment is carried out on the semiconducting single-walled carbon nanotubes combined with the nitrogen heterocyclic aromatic small molecule compound to degrade the nitrogen heterocyclic aromatic small molecule compound to obtain a semiconducting single-walled carbon nanotube with a clean surface and no dispersant .

[0028] The nitrogen-heterocyclic aromatic small molecular c...

Embodiment 1

[0051] (1) Take 50 mg of dispersant 4HP-C8 and 25 mg of Arc-discharge single-walled carbon nanotubes and put them in 100 ml of toluene solvent. After ultrasonic dispersion for 20 minutes, place in a centrifuge for centrifugation at a centrifugation speed of 10,000 g and a centrifugation time of 20 minutes. Take the supernatant (that is, the carbon nanotube dispersion).

[0052] (2) Photodegradation of nitrogen-heterocyclic small molecular aromatic compound 4HP-C8: irradiate the supernatant obtained in step (1) with a high-power specific light source (ultraviolet light source) for 10-30 minutes to obtain metastable carbon nanotube flocs Precipitate.

[0053] (3) Treatment and collection of carbon nanotubes with clean surface: filter out the metastable flocculent precipitate obtained in step (2) with a filter membrane with a pore size of about 1um, and wash with an organic solvent, and then put the obtained carbon nanotubes into Simple ultrasonic dispersion in chloroform.

Embodiment 2

[0055] (1) Take 100 mg of dispersant 4HP-C6 and 25 mg of HiPCO single-walled carbon nanotubes in 98 ml of toluene solvent. After ultrasonic dispersion for 1 h, place in a centrifuge for centrifugation at a centrifugation speed of 100,000 g for 1 h. Take the supernatant.

[0056] (2)-(3): The operation is the same as that of steps (2)-(3) in Example 1.

[0057] The single-walled carbon nanotube raw materials in the foregoing examples 1-2 can be prepared or purchased through known methods in the industry. For example, it may be a single-walled carbon nanotube synthesized by HiPCO method, CoMocat method, ACCVD method, arc discharge method, laser ablation method, or the like.

[0058] see figure 1 Shown is the absorption spectrum of semiconducting single-walled carbon nanotubes selectively dispersed by 4HP-C8 in Example 1 and the semiconducting single-walled carbon nanotubes redispersed in chloroform after photolysis of 4HP-C8.

[0059] see figure 2 Shown is the Raman spectr...

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Abstract

The invention discloses a method for preparing single-walled carbon nanotubes with clean surfaces and no dispersant, which comprises: uniformly mixing single-walled carbon nanotubes and nitrogen-heterocyclic aromatic small molecular compounds in a dispersion medium to form a dispersion solution; The dispersed solution is separated to form a solid phase part and a liquid phase part, and the liquid phase part contains enriched semiconductor-type single-walled carbon nanotubes combined with the nitrogen heterocyclic aromatic small molecular compound; The semiconductive single-walled carbon nanotubes of nitrogen heterocyclic aromatic small molecular compounds are subjected to light treatment to degrade the nitrogen heterocyclic aromatic small molecular compounds, and the semiconductive single-wall carbon nanotubes with clean surfaces and no dispersants are obtained. The preparation method provided by the invention is suitable for large-scale preparation of single-walled carbon nanotubes with clean surfaces, which is simple, effective and low in cost.

Description

technical field [0001] The invention particularly relates to a method for preparing single-walled carbon nanotubes with clean surfaces and no dispersant, and belongs to the technical field of carbon nanotubes. Background technique [0002] Due to their excellent optical and electrical properties, single-walled carbon nanotubes (SWCNTs) are considered to be the most promising materials in nanoscience and technology. However, generally produced single-walled carbon nanotubes contain different chiral species, and different chiral carbon nanotubes have different properties such as different electrical conductivity, which limits their applications. Therefore, the conductive properties or chiral structure separation techniques of SWNTs have been developed rapidly in recent years, such as density gradient centrifugation, ion exchange chromatography, gel chromatography columns, electrophoresis, aqueous two-phase systems, and conjugated polymers. Coating and small molecule extractio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/159C01B32/174C01B32/17B82Y40/00B82Y30/00
CPCC01B2202/02C01B2202/22C01P2002/82
Inventor 纪其燕金赫华李清文韩杰邱松
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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