Manufacturing method of carbon nano tube paper

A carbon nanotube paper and carbon nanotube technology are applied in the field of carbon nanotube paper preparation, which can solve the problems of difficult quality control of carbon nanotubes, loss of carbon nanotubes, and lack of carbon nanotubes, and achieve good environmental stability. , The effect of uniform texture and long service life

Inactive Publication Date: 2004-02-18
TSINGHUA UNIV
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Problems solved by technology

Although the first method prepares pure carbon nanotubes, the production process is cumbersome
Although the second method does not require high temperature, it cannot obtain pure carbon nano
But this method adopts the method of filtering to form carbon nanotube flakes, and in practice, the diameter of carbon nanotubes is nanoscale, which requires the pore size of the filter membrane to be very small (the cost of such a filter membrane is also relatively high), and in the filtration , some carbon nanotubes will be lost, especially when forming extremely thin carbon nanotube sheet materials, the thickness and the quality of carbon nanotubes per unit area are difficult to control
Due to the limitation of the filter device, the size and shape of the sheet electrode, the shape is also limited

Method used

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  • Manufacturing method of carbon nano tube paper
  • Manufacturing method of carbon nano tube paper
  • Manufacturing method of carbon nano tube paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1g of carbon nanotubes, pour it into a mixed solution of 1000ml of concentrated sulfuric acid and concentrated nitric acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1), and at 70°C, ultrasonically vibrate and stir. After reacting for 24 hours, use Dilute with deionized water, filter, wash the filter cake with deionized water, and ultrasonically disperse the filter cake in deionized water to form a carbon nanotube solution; pour the carbon nanotube solution into a flat plastic container at room temperature drying under the hood to form carbon nanotube paper. Gained carbon nanotube paper, its thickness is 50 μm, has higher electrical conductivity, and its square resistance is 13Ω / 1cm, is far higher than the conductivity of carbon fiber paper (its thickness is 500 μm), and the square resistance of carbon fiber paper is 35Ω / 1cm . figure 1 is the structure of native carbon nanotubes, figure 2 It is the structure of carbon nano...

Embodiment 2

[0026] Weigh 1g of carbon nanotubes, pour it into a mixed solution of 1000ml of concentrated sulfuric acid and concentrated nitric acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1), at 70°C, ultrasonically vibrate, and stir, after reacting for 24 hours, then Dilute with deionized water, filter, wash the filter cake with deionized water, ultrasonically disperse the filter cake in deionized water to form a carbon nanotube solution, pour the carbon nanotube solution into a stainless steel container with a flat bottom, and keep it at room temperature drying under the hood to form carbon nanotube paper. Gained carbon nanotube paper, its thickness is 70 μm, has higher electrical conductivity, and its square resistance is 10Ω / 1cm, is far higher than the conductivity of carbon fiber paper (its thickness is 500 μm), and the square resistance of carbon fiber paper is 35Ω / 1cm . Figure 5 It is the structure of carbon nanotube paper formed on a sta...

Embodiment 3

[0027] Embodiment 3. take by weighing 1g carbon nanotube, pour in the mixed solution (the volume ratio of concentrated sulfuric acid and concentrated nitric acid 3: 1) of 100ml vitriol oil and concentrated nitric acid, and stir, after reacting at room temperature for 48 hours, then use Dilute with deionized water, filter, wash the filter cake with deionized water, ultrasonically disperse the filter cake in deionized water to form a carbon nanotube solution, and pour the carbon nanotube solution into a stone container with a flat bottom. Dry to form carbon nanotube paper. Gained carbon nanotube paper, its thickness is 500 μ m, has higher electrical conductivity, and its sheet resistance is 17 Ω / 1cm, is far higher than the electrical conductivity of carbon fiber paper (its thickness is 500 μ m), and the sheet resistance of carbon fiber paper is 35 Ω / 1 cm . Figure 6It is the structure of carbon nanotube paper formed on a stone carrier. Compared with native carbon nanotubes, ca...

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Abstract

A carbon nanotube paper is prepared from carbon nanotubes through adding them to acid, heating or thermal reflux, and/or ultrasonic stirring, removing impurity, diluting in water, filtering, washing the filtered cake, dispersing the carbon nanotubes in water by ultrasonic stirring, spreading on carrier, and drying. It has regular structure, high uniformity, purity and electric conductivity, and enough mechanical strength.

Description

technical field [0001] The invention relates to a forming technology of carbon nanotubes, in particular to a preparation method of carbon nanotube paper. Background technique [0002] Nanotechnology is the commanding height of scientific and technological development in the 21st century and the leading technology of the new industrial revolution. In November 1991, Iijima, an electron microscope expert from Japan's NEC, first discovered carbon nanotubes under a high-resolution transmission electron microscope (HRTEM), which aroused widespread concern. Carbon nanotubes are one-dimensional carbon materials composed of graphite-like hexagonal grids. The tubes are composed of a single layer or multiple layers, with a diameter of several nanometers to tens of nanometers and a length of several microns. The lamellar spacing is 0.34nm, which is slightly larger than that of graphite (0.335nm). Carbon nanotubes have a very wide range of applications due to their concentrated distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C08J5/02
Inventor 周啸杨红生
Owner TSINGHUA UNIV
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