Method of cutting carbon nanotubes
A carbon nanotube, micron-scale technology, applied in the direction of carbon nanotubes, nanocarbon, nanotechnology, etc., can solve the problems of difficulty in producing short carbon nanotubes, structural damage of carbon nanotubes, and high cost of short carbon nanotubes
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Embodiment 1
[0052] Add 0.1 g of single-wall carbon nanotube powder (Carbon Nanotechnologies Inc., 601B) with an average length of 3 μm into a ball milling device (trade name: Cryogenic Sample Crusher, model JFC-1500; Japan Analytical Industry Co., Ltd., Japan) , and at a temperature of 77K (realized by using liquid nitrogen), the low-temperature ball milling process was continuously performed for 10 minutes to crush the carbon nanotubes. Thus, short carbon nanotubes each having at least one open end and an average length of 1 μm were obtained.
[0053] FIG. 3 is a scanning electron microscope (SEM) photograph of single-walled carbon nanotubes used as raw materials in Example 1, and FIG. 4 is an SEM photograph of short carbon nanotubes obtained after low-temperature crushing treatment for 10 minutes. From Fig. 3 and Fig. 4, it can be seen that the long carbon nanotubes are transformed into short carbon nanotubes, while the formation of amorphous carbon is minimized.
Embodiment 2
[0055] 0.1 g of multi-walled carbon nanotube powder (Showa Denko Co., Ltd.; 842) with an average length of 3 μm was introduced into a ball milling device (trade name: Cryogenic Sample Crusher, model JFC-1500, Japan Analytical Industry Co. Ltd., Japan), and the cryogenic ball milling process was continuously performed for 10 minutes at a temperature of 77K (realized by using liquid nitrogen) in order to crush carbon nanotubes. Thus, short carbon nanotubes having an average length of 0.25 μm each having at least one end open in each tube were obtained.
[0056] FIG. 5 is an SEM photograph of multi-walled carbon nanotubes used as raw materials in Example 2, and FIG. 6 is an SEM photograph of short carbon nanotubes obtained after low-temperature crushing treatment for 10 minutes. From Figures 5 and 6, it can be seen that the long carbon nanotubes are transformed into short carbon nanotubes, while the formation of amorphous carbon is minimized.
Embodiment 3
[0058] 50 mg of single-wall carbon nanotube powder (Carbon Nanotechnologies Inc., 601B) with an average length of 10 μm and 250 mg of Ag metal particles with a diameter of 5 μm were introduced into a ball milling device (trade name: Cryogenic Sample Crusher, model JFC-1500; Japan Analytical Industry Co. , Ltd., Japan), and continuous ball milling at a temperature of 77K (realized using liquid nitrogen) for 10 minutes in order to crush carbon nanotubes and metal particles. Thus, a mixture of short carbon nanotubes having at least one end open and having an average length of 1 μm in each tube and Ag metal particles having a size of 33 nm was obtained.
[0059] FIG. 7 illustrates the results of X-ray diffraction (XRD) performed after cryogenic milling. The results in FIG. 7 show that the Ag metal particles have a size of 330 Ȧ.
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