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Carbon nanotube dispersant and dispersion method based on carbazolyl conjugated polymer

A technology of conjugated polymers and carbon nanotubes, which is used in the field of carbon nanotube dispersants based on carbazole-based conjugated polymers, the dispersion of double-walled carbon nanotubes, and the monodispersion of carbon nanotubes. Water surface tension is high, easy to deactivate and other problems, to achieve the effect of good conductivity and excellent conductivity

Active Publication Date: 2018-05-11
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Typical biomolecular dispersants include DNA and organic matter, etc., such dispersant molecules are difficult to obtain and expensive, and they are easily inactivated in vitro, so they have high requirements for the dispersion system.
In addition, the above-mentioned three types of dispersants are all water-soluble substances, but the surface tension of water is relatively high and the volatility is poor, which makes it difficult to apply the aqueous dispersion of double-walled carbon nanotubes in various electronic devices.

Method used

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  • Carbon nanotube dispersant and dispersion method based on carbazolyl conjugated polymer
  • Carbon nanotube dispersant and dispersion method based on carbazolyl conjugated polymer
  • Carbon nanotube dispersant and dispersion method based on carbazolyl conjugated polymer

Examples

Experimental program
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preparation example Construction

[0061] More specifically, for example, a typical synthesis method of carbazole-based conjugated polymers includes: making 3,6-dibromocarbazole and 2,7-boronate carbazole undergo a Suzuki coupling reaction to obtain the Carbazole-based conjugated polymers.

[0062] Further, the synthesis method may include:

[0063] Take 3,6-dibromocarbazole, 2,7-boronate carbazole and the catalyst and mix them uniformly in an organic solvent, then add saturated potassium carbonate solution to form a mixed reaction system;

[0064] The mixed reaction system is frozen and solidified, and vacuumized to degas, then the mixed reaction system is returned to room temperature, and heated to reflux for reaction, and then the formed reaction mixture is post-treated to obtain the carbazole-based conjugated polymer.

[0065] Further, the organic solvent includes tetrahydrofuran, but is not limited thereto.

[0066] Further, the catalyst includes tetrakis(triphenylphosphine)palladium, but is not limited...

Embodiment 1

[0077] Embodiment 1: Please refer to the following formula showing a synthesis principle of a carbazole-based conjugated polymer (PCC) in a typical embodiment of the present invention.

[0078]

[0079] Concrete, the synthetic technique of aforementioned carbazole-based conjugated polymer (PCC) comprises the following steps:

[0080] a. Weigh 0.2g~1.3g 3,6-dibromocarbazole and 0.1g~0.5g 2,7-boronate carbazole as two polymerization reaction monomers and an appropriate amount of catalyst tetrakis(triphenylphosphine) palladium into two ports In the round bottom flask, add 15mL THF (tetrahydrofuran), stir magnetically until dissolved, then add 10mL saturated potassium carbonate solution, then freeze the reaction flask with liquid nitrogen, make the reaction system completely solidified, and then vacuumize and degas for 30min;

[0081] b. Remove the liquid nitrogen, and after the reaction system returns to room temperature, heat it to 70°C with a silicone oil bath and reflux for...

Embodiment 2

[0100] Example 2: Referring to Example 1, but using commercially available single-walled carbon nanotubes (about 0.8 nm to 1.2 nm in diameter) instead of the former double-walled carbon nanotubes to obtain a single-walled carbon nanotube dispersion (PCC-SWCNT). refer to Figure 6 is the near-infrared-visible-ultraviolet absorption spectrum of the single-walled carbon nanotube dispersion. It can be seen that PCC also has a good dispersion ability for single-walled carbon nanotubes. Then referring to Example 1, a thin film was made from the double-walled carbon nanotube dispersion, and the resistivity of the thin film was tested. It can be found that the thin film still maintains good electrical conductivity.

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Abstract

The invention discloses a carbon nanotube dispersant and dispersion method based on a carbazolyl conjugated polymer. The carbazolyl conjugated polymer has a structure represented by the formula as shown in the specification, wherein R is an alkyl group of C3 to C25, n is 7-70, and the number average molecular weight is 5*10<3>g / mol-5*10<4>g / mol. The carbazolyl conjugated polymer used as the carbonnanotube dispersant can be used for efficient and rapid monodispersion of carbon nanotubes (especially double-walled carbon nanotubes) in an organic phase, the conductivity of the carbazolyl conjugated polymer is better than that of a surfactant, the degree of tight packing of the carbazolyl conjugated polymer on the surface of the carbon nanotubes is much lower than that of the surfactant, conductive properties of the double-walled carbon nanotubes are less influenced, much surface of the double-walled carbon nanotubes can be more exposed, the excellent conductive properties can be fully played, meanwhile the combination of the carbazolyl conjugated polymer and the carbon nanotubes are achieved mainly through the Pi-Pi interaction, and the non-covalent effect may not cause damage to thesurface of the carbon nanotubes.

Description

technical field [0001] The invention relates to a method for dispersing double-walled carbon nanotubes, in particular to a carbazole-based conjugated polymer-based carbon nanotube dispersant and a carbon nanotube monodisperse method, and belongs to the technical field of nanomaterials. Background technique [0002] Double-walled carbon nanotubes (DWCNTs) have excellent electrical conductivity and have potential applications in the fields of transparent conductive films and field effect transistors. However, the double-walled carbon nanotube powders obtained by the current growth method are aggregates. In order to give full play to the electrical conductivity of double-walled carbon nanotubes, it is necessary to obtain a stable monodisperse liquid capable of uniform film formation over a large area. Therefore, it is very important to find an efficient dispersant. [0003] In the prior art, double-walled carbon nanotube dispersants mainly include three types of surfactants, ...

Claims

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Application Information

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IPC IPC(8): C01B32/174
CPCC01P2004/04
Inventor 何缘邱松金赫华李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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