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Method for preparing carbon nanotube film by removing residual dispersant by alkali treatment

A carbon nanotube film and carbon nanotube technology are applied in the field of carbon nanotube film preparation, and can solve problems such as affecting the flexibility of the film, brittle PET substrates, and decreased film stability.

Inactive Publication Date: 2010-12-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although acid treatment can effectively remove dispersants, they will introduce doping to reduce the stability of the film, and long-term acid treatment will make the PET substrate brittle and affect the flexibility of the film

Method used

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  • Method for preparing carbon nanotube film by removing residual dispersant by alkali treatment
  • Method for preparing carbon nanotube film by removing residual dispersant by alkali treatment
  • Method for preparing carbon nanotube film by removing residual dispersant by alkali treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add 5 mg of RNA to 50 mL of deionized water, stir magnetically until the RNA is completely dissolved, then add 10 mg of single-walled carbon nanotubes, and sonicate in a water bath for 2 hours to obtain a black suspension. Centrifuge the suspension at 13000rpm for 30min, take the supernatant, repeat the centrifugation once, take the supernatant and dilute it 20 times, then take 10-60mL dilution respectively, and filter to form a carbon nanotube film. The filter membrane and the membrane formed on the filter membrane were transferred to the substrate together, dried in air at 60° C. for 2 hours, and then soaked in acetone for 30 minutes to remove the filter membrane. The obtained carbon nanotube film was finally dried at 60° C. for 3 hours. The transmittance of the film was measured by ultraviolet-visible spectrometer, and the film resistance was measured by four-probe resistivity meter. Then soak the film in 5% sodium hydroxide solution for 1 hour, wash it with deioniz...

Embodiment 2

[0035] Add 10 mg of DNA to 50 mL of deionized water, stir magnetically until it is completely dissolved, then add 10 mg of single-walled carbon nanotubes, sonicate the probe for 10 min in an ice-water bath, and then sonicate in a water bath for 1.5 h to obtain a black suspension. Centrifuge the obtained black suspension at 13000rpm for 30min, take the supernatant, repeat the centrifugation twice, and finally dilute the supernatant 10 times, take 10-40mL respectively to prepare a transparent conductive film by vacuum filtration, measure its resistance, permeability Rate. Then soak the film in 20% sodium hydroxide solution for 0.5 hours, then wash, dry, and measure its resistance and transmittance. figure 2 The transmission electron micrograph of single-walled carbon nanotubes dispersed as DNA shows that the carbon nanotubes are uniformly dispersed and the size of the tube bundle is small. Figure 4 It was shown that the sheet resistance was greatly reduced after alkali treatm...

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Abstract

The invention provides a method for preparing a carbon nanotube film by removing residual dispersant by alkali treatment, which is characterized by comprises the following steps: after forming a carbon nanotube film on a substrate by the filtering method, soaking the carbon nanotube film in a sodium hydroxide solution for a period of time so that dispersant is chemically degraded, soaking the carbon nanotube film with deionized water and flushing the soaked carbon nanotube film to remove the dispersant scraps after degrading. The alkali treatment for removing the dispersant has the characteristic of mild conditions, thus having no damage the carbon nanotube film and the flexible substrate; the alkali treatment can effectively remove the dispersant, greatly enhance the conductivity of the film, and easily and efficiently manufacture flexible low-resistance high-transmittance single-wall carbon nanotube films on the premise of keeping the flexibility and permeability of the film. In addition, the alkali treatment for removing the dispersant can not introduce impurities, so that the treated film has high stability.

Description

technical field [0001] The invention relates to a method for preparing a high-performance carbon nanotube film by using alkali treatment to remove residual dispersant, more precisely, to use alkali treatment to remove residual DNA or RNA dispersant to produce a flexible low sheet resistance, high light-transmitting single The invention relates to a method for wall carbon nanotube thin film, which belongs to the field of preparation of carbon nanotube thin film. Background technique [0002] Transparent conductive films are widely used in various electronic devices such as transparent electrodes, touch screens, liquid crystal displays, and organic light-emitting diodes. In the past decades, ITO has monopolized the market of transparent conductive films due to its excellent conductivity and transparency. Unfortunately, the shortcomings of ITO have gradually emerged in recent years. First, the price of indium has risen sharply in the past decade, which has greatly increased t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 高濂王冉冉孙静张婧
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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