Manufacturing apparatus and method for carbon nanotube
Provided is a manufacturing apparatus for a carbon nanotube, including: at least two electrodes whose tips are opposed to each other, and a power supply that applies a voltage between the two electrodes to generate discharge plasma in a discharge area between the two electrodes. By using a porous carbonaceous material for at least one of the two electrodes, it is possible to provide a manufacturing apparatus and method for a carbon nanotube, which are capable of manufacturing at a low cost the carbon nanotube that is inexpensive and has a further higher purity.
1. A manufacturing method for a carbon nanotube, comprising:
applying a voltage between two electrodes whose tips are opposed to each other;
generating discharge plasma in a discharge area between the two electrodes; and
using an electrode made of a porous carbonaceous material, wherein said porous carbonaceous material is charcoal as at least one of the two electrodes whose tips are opposed to each other.
2. A manufacturing method for a carbon nanotube according to claim 1 , further comprising subjecting the porous carbonaceous material to a dehydration process prior to the generating of the discharge plasma in the discharge area between the two electrodes.
3. A manufacturing method for a carbon nanotube according to claim 1 , wherein the charcoal is binchotan charcoal or bamboo charcoal.
4. A manufacturing method for a carbon nanotube according to claim 1 , wherein the porous carbonaceous material is a charcoal processed more than 700° C.
5. A manufacturing method for a carbon nanotube according to claim 1 , wherein the porous carbonaceous material is a charcoal processed in a range of 850˜2500° C.
6. A manufacturing method for a carbon nanotube according to claim 1 , wherein the porous carbonaceous material is a charcoal processed in a range of 1000˜2500° C.
7. A manufacturing method for a carbon nanotube according to claim 1 , further comprising using the electrode made of the porous carbonaceous material as at least an anode of the two electrodes whose tips are opposed to each other.
8. A manufacturing method for a carbon nanotube according to claim 1 , further comprising forming, in a generation area of the discharge plasma, at least a magnetic field having lines of magnetic force in multiple directions or a magnetic field having a component in parallel with a flowing direction of a discharge current.
9. A manufacturing method for a carbon nanotube according to claim 1 , wherein the discharge plasma generated in the discharge area is arc plasma.