Method of treating carbon nano tube using electric arc discharging
A carbon nanotube and arc discharge technology, which is applied in the field of carbon nanotube purification and orderly arrangement, can solve the problems of carbon nanotube structure damage, and it is difficult to control carbon nanotubes from being oxidized or structurally damaged.
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Embodiment 1
[0017] Embodiment one: the carbon nanofiber bundle sample (long 10 millimeters, thick 500 microns) that adopts metal iron catalyst vapor phase synthesis is placed in the three-necked glass beaker, the negative pole of DC power is entered in the glass beaker by the side port of glass beaker and with One end of the carbon nanotube fiber bundle is in contact, the mouth of the rubber plug is sealed, the positive electrode of the power supply enters the beaker through another inlet, the mouth of the rubber plug is sealed, and the beaker is evacuated to 10 through the top port. -3 Torr, and then filled with high-purity argon at an atmospheric pressure, sealing the upper gas inlet. Adjust the power supply voltage to 24 volts, and briefly contact the positive electrode with the other end of the fiber in the beaker outside the beaker for 0.1 milliseconds, and electric sparks can be seen at the contact point outside the beaker. Observing the discharge-treated sample through scanning ele...
Embodiment 2
[0018] Embodiment 2: Connect the single-walled carbon nanotube fiber bundle synthesized by laser evaporation to the negative pole of the DC power supply with a thickness of 1 mm and a length of 2 cm, adjust the voltage to 24 volts, and quickly touch the other electrode to the other end of the fiber bundle At one end, leaving, an electrical spark can be observed at the contacts. The whole process is carried out in the air. Sampling the discharge-treated carbon nanotube fiber was placed on the copper grid of the transmission electron microscope for observation, and it can be seen that the end of the fiber ignited by spark discharge was cut. As shown in Figure 4.
Embodiment 3
[0019] Embodiment 3: Connect one end of the amorphous carbon nanotube flocs synthesized by arc discharge to one pole of the DC power supply with a volume of 5 mm x 5 mm x 5 mm, adjust the voltage to 24 volts, and quickly touch the other electrode to the non- On the other side of the crystalline carbon nanotube flocs, electric sparks can be observed at the contacts. The whole process is carried out in the air. Sampling the discharge-treated carbon nanotube flocs and observing them on the copper grid of scanning electron microscope and transmission electron microscope shows that the amorphous layer on the surface of the original amorphous carbon nanotubes is peeled off to form single-walled carbon nanotube bundles with clean surfaces. The original amorphous layer was transformed into particles with a diameter of 20nm. As shown in Figure 6.
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