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Dispersant for dispersing carbon nano-tube and preparation method of carbon nano-tube film

A technology of carbon nanofilm and carbon nanotube, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of reducing the transmittance of the film, and achieve the effect of favorable performance and excellent conductivity

Inactive Publication Date: 2010-07-14
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

However, these conductive polymers are colored substances, which have large absorption in the visible light region, which will reduce the transmittance of the film

Method used

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  • Dispersant for dispersing carbon nano-tube and preparation method of carbon nano-tube film
  • Dispersant for dispersing carbon nano-tube and preparation method of carbon nano-tube film
  • Dispersant for dispersing carbon nano-tube and preparation method of carbon nano-tube film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 10 mg of heparin into 50 mL of deionized water, stir to dissolve. Then add 10 mg of single-wall or multi-wall carbon nanotubes, and sonicate in a water bath for 2 hours to obtain a black suspension. Then the suspension was centrifuged at 13000rpm for 30min, the supernatant was taken, the above centrifugation process was repeated once, the supernatant was diluted 10 times, and then 10-50mL were taken for vacuum filtration to form a carbon nanotube film. The filter membrane and the membrane formed on it were transferred to the substrate together, dried in the 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. figure 1 It is a transmission electron microscope photo of the obtained supernatant, and ...

Embodiment 2

[0034]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 above suspension at 13000rpm for 30min, take the supernatant, repeat the centrifugation once, take the supernatant and dilute it 20 times, then take 10-60mL of the diluted solution respectively, and prepare a transparent conductive film by vacuum filtration. Concrete molding step is the same as embodiment 1. image 3 It is a transmission electron microscope photo of the obtained supernatant, it can be seen that the carbon tubes are uniformly dispersed, and the size of the tube bundle is about 5-7 nm. A thick film of organic matter can also be seen in the photo, indicating that not all the RNA was adsorbed on the carbon nanotubes, and a large amount remained in the solution. When the amount of RNA is reduced to 2.5mg, this phenomenon wil...

Embodiment 3

[0036] Add 10 mg of DNA to 50 mL of deionized water, stir magnetically until it is completely dissolved, then add 10 mg of multi-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 concentrated nitric acid for 10 minutes to 8 hours, and then measure its resistance and transmittance. Figure 6 It is a transmission electron micrograph of a carbon nanotube suspension prepared with DNA as a dispersant. It can be seen that the carbon tubes are uniformly dispersed, and the size of the tube bundle is small, mostly 3-5 nm. Depend on Figure 7 It can be seen that the resista...

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Abstract

The invention provides a method for dispersing a carbon nano-tube by degradable biological molecules and further preparing a carbon nano-tube film having low sheet resistance or having low sheet resistance and high transmittance in high production efficiency. The method is characterized in that the selected biological molecules are amphiphilic molecules with both lipophilic structure, such as long carbon chain frames and the like and hydrophilic groups, such as SO3-, PO4-, COO-, -OH and the like, thus having strong dispersing ability towards the carbon nano-tube. The suspension of the carbon nano-tube which is dispersed by the biological molecules has high concentration, small control size and good stability, and the required amount of the dispersant is far less than that of the traditional dispersant, such as SDS, SDBS and the like, thus reducing the contact resistance greatly introduced by the dispersant, and therefore, the prepared carbon nano-tube film has excellent electrical conductivity. The biological molecules basically have no absorption in a visible region, thus having little influence on the transmittance of the film. Moreover, the biological molecules are degradable and are easy to be removed from the film, thus providing an effective approach to further improve the electrical conductivity of the film.

Description

technical field [0001] The invention relates to a dispersant for dispersing carbon nanotubes and a method for preparing carbon nanotube films, more precisely, the invention provides a degradable biomolecular dispersant for dispersing carbon nanotubes, and a method for preparing transparent conductive films method. The invention has wide applications in the dispersion of carbon nanotubes, carbon nanotube films and electronic devices. Background technique [0002] In recent years, transparent conductive films of carbon nanotubes have attracted extensive attention. Because of its advantages of flexibility, easy operation, good conductivity, and natural color, it is widely used in electronic devices such as touch screens, liquid crystal displays, and organic light-emitting diodes. The methods for preparing carbon nanotube transparent conductive films include spin coating (Meitl, M.A.; Zhou, Y.X.; Gaur, A., et al. Nano Lett.2004, 4, 1643-1647.), dipping (Spotnitz, M.E.; Ryan, ...

Claims

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Application Information

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IPC IPC(8): B01F17/00C01B31/02B82B3/00C09K23/00
Inventor 高濂王冉冉孙静
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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