Method and apparatus for generating a carbon nanotube
In an apparatus and method of generating a carbon nanotube (CNT), a process chamber is heated to a target temperature and a catalyst powder is supplied into the heated process chamber. The catalyst powder moves in a first direction in the process chamber. A source gas is supplied into the process chamber in a second direction opposite to the first direction, so that the source gas delays the movement of the catalyst powder in the first direction and is reacted with the catalyst powder in the process chamber to thereby produce the CNT in the process chamber. Accordingly, the flow of the source gas against the flow of the catalyst powder reduces the drop velocity of the catalyst powder. Therefore, the source gas and the catalyst powder may be reacted with each other for a sufficiently long time.
1. An apparatus of generating a CNT, comprising:
a process chamber;
a catalyst supplier that supplies a catalyst powder into the process chamber in a first direction, the catalyst powder moving in a first direction in the process chamber; and
a source gas supplier that supplies a source gas into the process chamber in a second direction opposite to the first direction, so that the source gas delays the movement of the catalyst powder in the first direction and is reacted with the catalyst powder in the process chamber to thereby produce the CNT in the process chamber,
wherein the catalyst supplier includes a dispersion net that is positioned at an upper portion of the process chamber and has a mesh structure, so that the catalyst powder is dispersively supplied to the upper portion of the process chamber through the dispersion net and moves down in the first direction in the process chamber.
2. The apparatus of claim 1 , wherein the first direction is directed to a lower portion of the process chamber from an upper portion thereof and the second direction is directed to the upper portion of the process chamber from the lower portion thereof.
3. The apparatus of claim 1 , wherein the catalyst supplier includes at least one spray nozzle that is positioned at a sidewall of the process chamber and is directed to an upper portion of the process chamber, so that the catalyst powder is supplied to the upper portion of the process chamber through the spray nozzle and moves down in the first direction in the process chamber.
4. The apparatus of claim 1 , wherein the size of the dispersion net is substantially smaller than that of the process chamber.
5. The apparatus of claim 1 , further comprising a collector connected to the process chamber, so that the CNT is collected into the collector from the process chamber.
6. The apparatus of claim 5 , wherein the source gas supplier further includes a dispersion plate that is positioned at a lower portion of the process chamber and dispersively supplies the source gas into the process chamber and the collector is arranged under the process chamber in such a configuration that the CNT is collected through a gap space between the dispersion plate and a sidewall of the process chamber.
7. The apparatus of claim 1 , further comprising a gas exhauster arranged over the process chamber and having a cylindrical shape, so that the source gas is exhausted out of the process chamber through the gas exhauster by a cyclone process.
8. The apparatus of claim 1 , further comprising a chamber heater enclosing the process chamber, so that the interior of the process chamber is heated to a temperature at which the source and the catalyst.
9. An apparatus of generating a CNT, comprising:
a process chamber;
a catalyst supplier that supplies a catalyst powder into the process chamber in a first direction, the catalyst powder moving in a first direction in the process chamber; and
a source gas supplier that supplies a source gas into the process chamber in a second direction opposite to the first direction, so that the source gas delays the movement of the catalyst powder in the first direction and is reacted with the catalyst powder in the process chamber to thereby produce the CNT in the process chamber,
wherein the source gas supplier includes:
a gas reservoir in which the source gas is stored;
a supply pipe that is connected with both of the gas reservoir and the process chamber;
a control valve that is arranged at the supply pipe and controls an amount of the source gas supplied into the process chamber through the supply pipe; and
a dispersion plate that is positioned at a lower portion of the process chamber and has a plurality of spray holes, so that the source gas is dispersively supplied into the process chamber through the spray holes and moves upward in the second direction in the process chamber;
wherein the size of the dispersion plate is substantially smaller than that of the process chamber and the dispersion plate is positioned at a central portion of the process chamber spaced apart from a sidewall of the process chamber by a distance.
10. The apparatus of claim 9 , wherein the source gas supplier further includes a source heater by which the source gas is heated before supplying into the process chamber.
11. The apparatus of claim 10 , wherein the source heater includes a heating coil enclosing at least one of the gas reservoir and the supply pipe.
12. The apparatus of claim 10 , wherein the source heater includes a plasma heater interposed between the gas reservoir and the control valve.
13. The apparatus of claim 9 , wherein the gas reservoir includes:
a reaction gas reservoir in which a reaction gas is stored, the reaction gas being reacted with the catalyst powder in the process chamber to thereby generate the CNT in the process chamber; and
a carrier gas reservoir in which a carrier gas is stored, the carrier gas carrying the reaction gas into the process chamber.