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A high-pressure-resistant composite material and method for preparing carbon nanotubes modified by atomic layer deposition technology

A technology of atomic layer deposition and carbon nanotubes, which is applied in the field of high-voltage composite material preparation, can solve the problems of reduced dielectric breakdown strength and high dielectric loss of composite materials, and achieve improved dielectric breakdown strength and high dielectric constant. , The effect of increasing the relative permittivity

Inactive Publication Date: 2019-06-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dielectric loss of composites is often high due to the conductor-to-conductor transition near the percolation threshold, and the dielectric breakdown strength is similarly significantly reduced

Method used

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  • A high-pressure-resistant composite material and method for preparing carbon nanotubes modified by atomic layer deposition technology
  • A high-pressure-resistant composite material and method for preparing carbon nanotubes modified by atomic layer deposition technology
  • A high-pressure-resistant composite material and method for preparing carbon nanotubes modified by atomic layer deposition technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) acidifying carbon nanotubes with a mixed acid solution of sulfuric acid and nitric acid;

[0050] Configure the mixed acid solution according to the volume ratio of nitric acid and sulfuric acid as 1:4, and add carbon nanotubes at a ratio of 200 mg of particles per 20 ml of mixed acid to obtain a carbon nanotube suspension; the obtained carbon nanotube suspension is ultrasonically After oscillating for 30 minutes, place it in a water bath at 70 degrees Celsius and stir it magnetically for 3 hours; dilute the obtained suspension with deionized water, and use a suction filtration device to carry out suction filtration until the hydrogen ion concentration index of the suspension reaches 5; dry and collect, Acidified carbon nanotubes are obtained.

[0051] (2) Place the acidified carbon nanotubes in an atomic layer deposition chamber at 300°C, use nitrogen as the carrier gas, and blow into the trimethylaluminum source in the form of steam for 0.1 second, and then flush ...

Embodiment 2

[0069] The quality of the modified carbon nanotubes in step (3) is adjusted to account for 0.2%, 0.5% and 0.7% of the polymer mass respectively, and the other conditions are the same as in Example 1, and the relative dielectric constant of the obtained composite material is verified. .

[0070] image 3 It is the relation curve of relative permittivity and mass fraction of the composite material. The realization results show that for the composite material prepared by ALD deposition of aluminum oxide modified carbon nanotubes, when the mass fraction of doped carbon nanotubes is 0.7wt%, the dielectric constant is at a frequency of 10 7 Hz increased from 2 to 4 of the polymer, an increase of two times; when the doping concentration was 0.5wt%, the dielectric constant was at a frequency of 10 -2 Hz is increased from 3.5 to 15, which is more than 4 times stronger, and the relative permittivity is significantly increased, and with the increase of doping concentration, the relativ...

Embodiment 3

[0072] In step (3), the carbon nanotubes are directly doped, and the doping amounts are 0-1%, and the other conditions are the same as in Example 1, and the breakdown of the obtained composite material is verified.

[0073] Figure 4 Table 3 and Table 3 are the relationship charts between the dielectric breakdown and doping concentration of the composite materials, respectively.

[0074] The dielectric breakdown strength of the composite material that table 3 embodiment 2 makes

[0075] Carbon nanotube doping amount (%)

[0076] The experimental results show that the dielectric breakdown strength of the composite material is significantly reduced by directly doping carbon nanotubes; and for the composite material prepared by doping aluminum oxide modified carbon nanotubes, the experimental results show that with the increase of doping concentration, The dielectric breakdown strength increases obviously at first, even exceeding the breakdown field strength of the pol...

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Abstract

The invention discloses a high-pressure resistant composite material prepared through modifying a carbon nanotube by employing an atomic layer deposition technology and a method. The method mainly comprises the steps of (1) acidifying the carbon nanotube by using mixed acid liquid of sulfuric acid and nitric acid; and (2) putting the acidified carbon nanotube into an atomic layer deposition cavity at 295-305 DEG C, taking a trimethyl aluminum source and deionized water as precursor sources of an ALD deposition thin film, and depositing aluminum oxide on the surface of the acidified carbon nanotube; and (3) uniformly dispersing the deposited carbon nanotube into a polymer matrix by using ultrasonic oscillation and magnetic stirring, and carrying out sample preparation and drying through a spin coater to obtain the high-pressure resistant composite material. Compared with a conductive particle-doped polymer matrix composite material and a pure polymer matrix reported in the literature, the composite material prepared by the method has the advantages that the breakdown strength is significantly improved; and a novel idea is provided for preparation of the polymer matrix composite material with a high dielectric constant and high breakdown field strength.

Description

【Technical field】 [0001] The invention belongs to the technical field of high-pressure-resistant composite material preparation, and in particular relates to a high-voltage-resistant composite material prepared by modifying carbon nanotubes by atomic layer deposition technology and a method thereof. 【Background technique】 [0002] Polymer materials usually have the characteristics of high insulation performance, good chemical corrosion resistance, and easy processing, and are currently one of the most widely used materials. However, although the dielectric breakdown strength of polymers has been high (E>200kV mm -1 ), but the relative permittivity is very low (κ<5), which greatly restricts the application of polymers. Therefore, it is an important goal of scientific research and engineering practice to greatly increase the relative dielectric constant of polymers while ensuring other excellent properties. A relatively common method is to dope ferroelectric ceramic pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K9/02C08K7/24
CPCC08K7/24C08K9/02C08K2201/011C08L83/04
Inventor 张洁左养建张易军叶作光任巍
Owner XI AN JIAOTONG UNIV
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