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Flexible carbon nano tube-polyurethane infrared sensitive thin film and preparation method thereof

A carbon nanotube and sensitive film technology, applied in the field of carbon nanomaterials, can solve the problems of high preparation conditions, poor mechanical strength, poor uniformity, etc., and achieve easy control of the production process, controllable thickness and area, good mechanical strength Effect

Inactive Publication Date: 2012-08-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the directly compressed carbon nanotube flakes have a loose structure and poor mechanical strength; the carbon nanotube films directly grown on the substrate by physical methods have complex preparation processes and high requirements for experimental equipment and preparation conditions; coating, printing, The uniformity of carbon nanotube films prepared by filtration and other methods is poor, and it is easy to form carbon nanotube islands, which reduces the mechanical properties, electrical properties and photoelectric properties of carbon nanotube films; while the single-layer carbon nanotubes prepared by LB film technology Tubular film requires a hard substrate support, and the manufacturing process is complex and difficult to control, especially rigid and high-temperature-resistant substrates such as quartz substrates, silicon substrates, and high-temperature-resistant metal materials, which limit its production scale and application range
Considering that the application of flexible and unsupported carbon nanotube films is more convenient, it is undoubtedly worth looking forward to combining carbon nanotubes with polymers to form films, but usually the orientation of carbon nanotubes in polymers is randomly distributed, and at the same time in composite materials During the mixing process, the uneven dispersion of carbon nanotubes will reduce the density of carbon nanotubes distributed in the same direction, which will greatly affect the performance of carbon nanotube films. More importantly, not all carbon nanotube-polymer Composite films all have good infrared sensitive response

Method used

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  • Flexible carbon nano tube-polyurethane infrared sensitive thin film and preparation method thereof
  • Flexible carbon nano tube-polyurethane infrared sensitive thin film and preparation method thereof
  • Flexible carbon nano tube-polyurethane infrared sensitive thin film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 10mg of multi-walled carbon nanotubes (20-40nm in diameter, 1-50μm in length) and 10mg of polyester polyurethane into 10ml of N,N'-dimethylformamide, keep the temperature of the water bath at 60°C, and use 100W ultrasonic After 20 minutes of auxiliary dispersion, the metal substrate is immersed in the carbon nanotube dispersion liquid. The production temperature was set at 80°C, and after the solvent volatilized slowly, a carbon nanotube-polyurethane composite film with a film thickness of 15 μm could be deposited on the metal sheet. The film is peeled off from the base plate, and can be cut into the required size, and signal wires are connected to both ends of the film to make an infrared detector. Its response time is about 10s, and the infrared photoresponse current density is about 0.01mAcm -2 .

Embodiment 2

[0028] Add 100mg of single-walled carbon nanotubes (1-3nm in diameter, 1-2μm in length) and 100mg of polyester polyurethane into 10ml of N,N'-dimethylacetamide, keep the temperature of the water bath at 60°C, and use 100W ultrasonic Auxiliary dispersion for 30 minutes, and then immerse the quartz substrate in the carbon nanotube dispersion liquid. The temperature was set at 70°C, and after the solvent volatilized slowly, a carbon nanotube-polyurethane composite film with a film thickness of 400 μm could be deposited on the glass sheet. The film is peeled off from the base plate, and can be cut into the required size, and signal wires are connected to both ends of the film to make an infrared detector. Its response time is 5s, and the infrared photoresponse current density is 0.03mAcm -2 .

Embodiment 3

[0030]Add 80mg of double-walled carbon nanotubes (2-4nm in diameter, 1-50μm in length) and 50mg of polyether polyurethane into 10ml of dichloroethane, keep the temperature of the water bath at 20°C, disperse with 100W ultrasound for 20min, and then The silicon substrate is immersed in the carbon nanotube dispersion. The fabrication temperature is set at 40°C, and after the solvent volatilizes slowly, a carbon nanotube-polyurethane composite film with a film thickness of 300 μm can be deposited on the silicon substrate. The film is peeled off from the base plate, and can be cut into the required size, and signal wires are connected to both ends of the film to make an infrared detector. Its response time is 10s, and the infrared photoresponse current density is 0.015mAcm -2 .

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Abstract

The invention discloses a flexible carbon nano tube-polyurethane infrared sensitive thin film and a preparation method thereof. The composite thin film comprises the following components in percentage by weight: 80 to 99 percent of carbon nano tube and 1 to 20 percent of polyurethane, wherein the thickness of the thin film is 10 to 500 mu m. The preparation method comprises the following steps of: weighing the polyurethane and the carbon nano tube and adding into a solvent to prepare mixed solution with the polyurethane concentration of 1 to 10mg / ml and the carbon nano tube concentration of 1to 10mg / ml; performing a water bath on the mixed solution at the temperature of between 0 and 70 DEG C, and performing ultrasonic dispersion for 20 to 30 minutes under the power of 50 to 100W; and vertically immersing a flat substrate into the dispersion at the temperature of between 20 and 80 DEG C, slowly volatilizing the solvent and stripping from the substrate to obtain the composite thin film. The nano thin film has the advantages of high electric conductivity, high mechanical strength, sensitive response to infrared light, response time in 10-degree second scale, simple and convenient preparation technology and low manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, in particular to a flexible carbon nanotube-polyurethane infrared sensitive film and a preparation method thereof. Background technique [0002] Infrared detector is a converter of infrared radiant energy, which is the key component of infrared imaging device. It converts radiant energy into another energy form that is easy to measure, and in most cases, it is converted into electrical energy. Infrared detectors have been more and more widely used in military, medical, industrial, metallurgy, chemical and many other fields. Infrared detectors can be used in industrial automatic control, early diagnosis of cancer in medicine, fire alarm in fire fighting, burglar alarm in public security, remote sensing, telemetry, astronomical observation, geological exploration, etc. Superconducting infrared detectors are ideal detectors for resources and meteorological satellites, and are widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L75/08C08K7/00C08K3/04C08K9/02C08J5/18
Inventor 秦宗益范青青魏玉玲唐月姚瑶谢雨辰朱美芳
Owner DONGHUA UNIV