US20010001654A1 - Process for producing single-wall carbon nanotubes uniform in diameter and laser ablation apparatus used therein - Google Patents
Process for producing single-wall carbon nanotubes uniform in diameter and laser ablation apparatus used therein Download PDFInfo
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- US20010001654A1 US20010001654A1 US09/177,790 US17779098A US2001001654A1 US 20010001654 A1 US20010001654 A1 US 20010001654A1 US 17779098 A US17779098 A US 17779098A US 2001001654 A1 US2001001654 A1 US 2001001654A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/121—Coherent waves, e.g. laser beams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/16—Preparation
- C01B32/162—Preparation characterised by catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0871—Heating or cooling of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0873—Materials to be treated
- B01J2219/0881—Two or more materials
- B01J2219/0883—Gas-gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0873—Materials to be treated
- B01J2219/0892—Materials to be treated involving catalytically active material
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2202/00—Structure or properties of carbon nanotubes
- C01B2202/02—Single-walled nanotubes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2202/00—Structure or properties of carbon nanotubes
- C01B2202/20—Nanotubes characterized by their properties
- C01B2202/36—Diameter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/84—Manufacture, treatment, or detection of nanostructure
- Y10S977/842—Manufacture, treatment, or detection of nanostructure for carbon nanotubes or fullerenes
- Y10S977/844—Growth by vaporization or dissociation of carbon source using a high-energy heat source, e.g. electric arc, laser, plasma, e-beam
Definitions
- This invention relates to a carbon nanotube and, more particularly, to a process for producing a carbon nanotube and a laser ablation apparatus used therein.
- a typical example of the process for producing carbon nanotubes is disclosed by Andreas Thess et al in “Crystalline Ropes of Metallic Carbon Nanotubes”, Science, vol. 273, pages 483 to 487, Jul. 26, 1996.
- Metal catalyst particle such as nickel-cobalt alloy is mixed with graphite powder at a predetermined percentage, and the mixture is pressed so as to obtain a pellet.
- a laser beam is radiated to the pellet. The laser beam evaporates the carbon and the nickel-cobalt alloy, and the carbon vapor is condensed in the presence of the metal catalyst.
- Single-wall carbon nanotubes are found in the condensation. A problem is encountered in the prior art process in that the single-wall carbon nanotubes are not constant in diameter.
- the present inventors contemplated the problem inherent in the prior art process, and noticed that the ratio between the carbon vapor and the metal catalyst vapor was varied with time due to absorption of the laser light.
- the graphite powder was black, and took up the laser light rather than the metal catalyst.
- the laser light thus absorbed raised the temperature rapidly rather than the metal catalyst, and the metal catalyst was left in the surface portion.
- the metal catalyst layer reflected the laser light, and the graphite powder was less sublimated. This resulted in that the purity of carbon was not uniform. For this reason, the carbon nanotubes did not become constant in diameter.
- the present invention proposes to independently evaporate carbon and metal catalyst.
- a process for producing carbon nanotubes comprising the steps of preparing a source of carbon vapor and a source of catalyst vapor physically separated from each other, radiating laser beams to the source of carbon vapor and the source of catalyst vapor so as to generate a carbon vapor/ cluster and a catalyst vapor/cluster, and allowing the carbon vapor/cluster to be mixed with the catalyst vapor/cluster so as to form the carbon vapor/cluster into carbon nanotubes.
- a laser ablation system for producing carbon nanotubes comprising a reactor having an air-tight chamber where a source of carbon vapor and a source of catalyst vapor are separately provided, a laser beam generator provided for the reactor and radiating laser beams to the source of carbon vapor and the source of catalyst vapor for producing a carbon vapor/cluster and a catalyst vapor/cluster from the source of carbon vapor and the source of catalyst vapor, respectively, an evacuating sub-system connected to the reactor for evacuating a gaseous mixture from the air-tight chamber, a carrier gas supply sub-system connected to the reactor supplying carrier gas to the air-tight chamber for forming a carrier gas flow in the air-tight chamber, and a collector provided in the carrier gas flow and capturing carbon nanotubes formed from the carbon vapor/cluster in the presence of the catalyst vapor/cluster and carried on the carrier gas flow.
- FIGS. 1A to 1 C are schematic views showing a process for producing carbon nanotubes according to the present invention.
- FIG. 2 is a schematic view showing a carbon pellet and metal catalyst pellet independently radiated with laser beams.
- FIGS. 1A to 1 C illustrate a process for producing carbon nanotubes embodying the present invention.
- the process starts with preparation of a carbon pellet 1 , a metal catalyst pellet 2 and a laser ablation system 3 .
- the carbon pellet 1 , the metal catalyst pellet 2 and the laser ablation system 3 are detailed hereinbelow with reference to FIG. 1A.
- the carbon pellet is formed from graphite.
- the graphite consists of carbon, and is shaped into the carbon pellet by using a standard pelleting machine.
- the carbon pellet 1 has a plate-like configuration, and is 10 millimeters long and 3 to 5 millimeters wide.
- the metal catalyst pellet 2 is formed of nickel-cobalt alloy.
- the nickel and the cobalt are regulated to the atomic ratio of 1:1.
- Nickel, cobalt, platinum, palladium and alloys thereof are available for the metal catalyst.
- the alloy contains at least two elements selected from nickel, cobalt, platinum and palladium.
- the metal catalyst is also shaped into a plate-like configuration by suing the pelleting machine, and is equal in dimensions to the carbon pellet 1 .
- the laser ablation system 3 includes a reactor 3 a, an evacuating sub-system 3 b, an inert gas supply sub-system 3 c, a laser beam generator 3 d, a heater 3 e, a collector 3 f, a spacer 3 g (see FIGS. 1B and 1C) and a controller 3 h.
- the evacuating sub-system 3 b and the inert gas supply sub-system 3 c create vacuum in the reactor, and cause inert gas to flow through the reactor 1 as indicated by arrows AR 1 .
- the heater 3 e maintains the inside of the reactor 3 a at a predetermined temperature range.
- the carbon pellet 1 and the metal catalyst pellet 2 are separately provided inside the reactor, and the spacer 3 g of quartz plate is provided between the carbon pellet 1 and the metal catalyst pellet 2 .
- the spacer 3 g is 0.3 millimeter thick.
- the laser beam generator 3 d radiates laser beams 3 r/ 3 s to the carbon pellet 1 and the metal catalyst pellet 2 , respectively.
- Carbon vapor and catalyst vapor are generated from the carbon pellet 1 and the metal catalyst pellet 2 , respectively, and condensate is captured by the collector 3 f.
- the process sequence is controlled by the controller 3 h.
- the reactor 3 a is formed of quartz or ceramic, and has a cylindrical configuration. Any material is available for the reactor 3 a in so far as it is hardly eroded in the ambience created in the reactor 3 a. Although the reactor 3 a is not limited to the cylindrical configuration, the cylindrical configuration is desirable.
- the evacuating sub-system 3 b includes a rotary vacuum pump 3 i, a pipe 3 j connected between the reactor 3 a and the rotary vacuum pump 3 i and an electromagnetic flow control valve 3 k inserted into the pipe 3 j.
- the inert gas supply sub-system 3 c includes a reservoir tank 3 m for inert gas such as, for example, argon gas, a pipe connected between the reservoir tank 3 m and the reactor 3 a and an electromagnetic flow control valve 3 o inserted into the pipe 3 n.
- the electromagnetic flow control valve 3 o supplies the argon gas to the inlet nozzle 3 p at 0.2 to 0.5 litter per minute, and the argon gas is blown off into the reactor 3 a.
- the rotary vacuum pump 3 i evacuates the argon gas
- the electromagnetic flow control valve 3 k maintains the argon gas in the reactor 3 a at 500 torr to 600 torr.
- the laser beam generator 3 d generates laser light, and radiates laser beams 3 r/ 3 s to the carbon pellet 1 and the metal catalyst pellet 2 , respectively.
- the laser beam generator 3 d includes a laser light emitting element formed of Nd contained single crystalline YAG (Yttrium Aluminum Garnet), and the laser light emitting element radiates laser light pulses 3 r/ 3 s.
- the laser light has 532 nanometer wavelength, and oscillates at 10 Hz.
- the pulse width ranges from 7 nanoseconds to 10 nanoseconds, and the power is regulated to 1.2 to 9.2 J/pulse.
- the laser beams 3 r/ 3 s has cross section of 0.2 cm 2 .
- the heater 3 e heats the reactor 3 a, and the controller 3 h maintains the inside of the reactor 3 a around 1200 degrees in centigrade.
- the heater 3 e may be implemented by an oven.
- the reactor 3 a is closed, and the rotary vacuum pump 3 i evacuates the air from the reactor 3 a.
- the inert gas supply system 3 c supplies the argon gas at 0.5 litter/minute.
- the evacuating sub-system 3 b cooperates with the inert gas supply system 3 c, and maintain the inside of the reactor 3 a at 600 mmHg.
- the argon gas flows from the nozzle 3 p toward the collector 3 f.
- the laser beam generator 3 d radiates the laser beams 3 r/ 3 s to the carbon pellet 1 and the metal catalyst pellet 2 .
- the pulse width and the power are adjusted to 10 nanosecond and 50 mJ/pulse cm 2 .
- the laser beams 3 r/ 3 s directly heat the carbon pellet 1 and the metal catalyst pellet 2 , and carbon vapor/cluster 4 and nickel-cobalt vapor/cluster 5 are constantly generated from the carbon pellet 1 and the metal catalyst pellet 2 , respectively, as shown in FIG. 1B.
- the argon gas carries the carbon vapor/cluster 4 and the nickel-cobalt vapor/cluster 5 toward the collector 3 f.
- the carbon vapor/cluster 4 are mixed with the nickel-cobalt vapor/cluster 5 , and forms into single-wall carbon nanotubes 6 .
- the single-wall carbon nanotubes 6 are carried toward the collector 3 f, and are captured by the collector 3 f as shown in FIG. 1C.
- the carbon vapor/cluster 4 and the nickel-cobalt vapor/cluster 5 are constant in mass, and keeps the content of carbon in the condensate or the single-wall carbon nanotubes 6 constant. This results in the constant diameter of the single-wall carbon nanotubes 6 .
- the carbon pellet 1 and the metal catalyst pellet 2 are used in the process according to the present invention, and make the single-wall carbon nanotubes constant in diameter.
- the carbon pellet and the metal catalyst pellet may have a semi-column configuration.
Abstract
Single-wall carbon nanotubes are produced from carbon vapor in the presence of nickel-cobalt catalyst vapor, and the carbon vapor and the nickel-cobalt catalyst vapor are constantly generated from a carbon pellet and a nickel-cobalt pellet under radiation of YAG laser beams so that the single-wall carbon nanotubes are constant in diameter.
Description
- This invention relates to a carbon nanotube and, more particularly, to a process for producing a carbon nanotube and a laser ablation apparatus used therein.
- A typical example of the process for producing carbon nanotubes is disclosed by Andreas Thess et al in “Crystalline Ropes of Metallic Carbon Nanotubes”, Science, vol. 273, pages 483 to 487, Jul. 26, 1996. Metal catalyst particle such as nickel-cobalt alloy is mixed with graphite powder at a predetermined percentage, and the mixture is pressed so as to obtain a pellet. A laser beam is radiated to the pellet. The laser beam evaporates the carbon and the nickel-cobalt alloy, and the carbon vapor is condensed in the presence of the metal catalyst. Single-wall carbon nanotubes are found in the condensation. A problem is encountered in the prior art process in that the single-wall carbon nanotubes are not constant in diameter.
- It is therefore an important object of the present invention to provide a process for producing single-wall carbon nanotubes, which is uniform in diameter.
- The present inventors contemplated the problem inherent in the prior art process, and noticed that the ratio between the carbon vapor and the metal catalyst vapor was varied with time due to absorption of the laser light. The graphite powder was black, and took up the laser light rather than the metal catalyst. The laser light thus absorbed raised the temperature rapidly rather than the metal catalyst, and the metal catalyst was left in the surface portion. The metal catalyst layer reflected the laser light, and the graphite powder was less sublimated. This resulted in that the purity of carbon was not uniform. For this reason, the carbon nanotubes did not become constant in diameter.
- To accomplish the object, the present invention proposes to independently evaporate carbon and metal catalyst.
- In accordance with one aspect of the present invention, there is provided a process for producing carbon nanotubes comprising the steps of preparing a source of carbon vapor and a source of catalyst vapor physically separated from each other, radiating laser beams to the source of carbon vapor and the source of catalyst vapor so as to generate a carbon vapor/ cluster and a catalyst vapor/cluster, and allowing the carbon vapor/cluster to be mixed with the catalyst vapor/cluster so as to form the carbon vapor/cluster into carbon nanotubes.
- In accordance with another aspect of the present invention, there is provided a laser ablation system for producing carbon nanotubes comprising a reactor having an air-tight chamber where a source of carbon vapor and a source of catalyst vapor are separately provided, a laser beam generator provided for the reactor and radiating laser beams to the source of carbon vapor and the source of catalyst vapor for producing a carbon vapor/cluster and a catalyst vapor/cluster from the source of carbon vapor and the source of catalyst vapor, respectively, an evacuating sub-system connected to the reactor for evacuating a gaseous mixture from the air-tight chamber, a carrier gas supply sub-system connected to the reactor supplying carrier gas to the air-tight chamber for forming a carrier gas flow in the air-tight chamber, and a collector provided in the carrier gas flow and capturing carbon nanotubes formed from the carbon vapor/cluster in the presence of the catalyst vapor/cluster and carried on the carrier gas flow.
- The features and advantages of the process and the laser ablation apparatus will be more clearly understood from the following description taken in conjunction with the accompanying drawings in which:
- FIGS. 1A to1C are schematic views showing a process for producing carbon nanotubes according to the present invention; and
- FIG. 2 is a schematic view showing a carbon pellet and metal catalyst pellet independently radiated with laser beams.
- FIGS. 1A to1C illustrate a process for producing carbon nanotubes embodying the present invention. The process starts with preparation of a
carbon pellet 1, ametal catalyst pellet 2 and alaser ablation system 3. Thecarbon pellet 1, themetal catalyst pellet 2 and thelaser ablation system 3 are detailed hereinbelow with reference to FIG. 1A. - The carbon pellet is formed from graphite. The graphite consists of carbon, and is shaped into the carbon pellet by using a standard pelleting machine. The
carbon pellet 1 has a plate-like configuration, and is 10 millimeters long and 3 to 5 millimeters wide. - The
metal catalyst pellet 2 is formed of nickel-cobalt alloy. The nickel and the cobalt are regulated to the atomic ratio of 1:1. Nickel, cobalt, platinum, palladium and alloys thereof are available for the metal catalyst. The alloy contains at least two elements selected from nickel, cobalt, platinum and palladium. The metal catalyst is also shaped into a plate-like configuration by suing the pelleting machine, and is equal in dimensions to thecarbon pellet 1. - The
laser ablation system 3 includes areactor 3 a, an evacuatingsub-system 3 b, an inertgas supply sub-system 3 c, alaser beam generator 3 d, aheater 3 e, acollector 3 f, aspacer 3 g (see FIGS. 1B and 1C) and acontroller 3 h. The evacuatingsub-system 3 b and the inertgas supply sub-system 3 c create vacuum in the reactor, and cause inert gas to flow through thereactor 1 as indicated by arrows AR1. Theheater 3 e maintains the inside of thereactor 3 a at a predetermined temperature range. Thecarbon pellet 1 and themetal catalyst pellet 2 are separately provided inside the reactor, and thespacer 3 g of quartz plate is provided between thecarbon pellet 1 and themetal catalyst pellet 2. Thespacer 3 g is 0.3 millimeter thick. Thelaser beam generator 3 dradiates laser beams 3 r/ 3 s to thecarbon pellet 1 and themetal catalyst pellet 2, respectively. Carbon vapor and catalyst vapor are generated from thecarbon pellet 1 and themetal catalyst pellet 2, respectively, and condensate is captured by thecollector 3 f. The process sequence is controlled by thecontroller 3 h. - The
reactor 3 a is formed of quartz or ceramic, and has a cylindrical configuration. Any material is available for thereactor 3 a in so far as it is hardly eroded in the ambience created in thereactor 3 a. Although thereactor 3 a is not limited to the cylindrical configuration, the cylindrical configuration is desirable. - The evacuating
sub-system 3 b includes arotary vacuum pump 3 i, apipe 3 j connected between thereactor 3 a and therotary vacuum pump 3 i and an electromagneticflow control valve 3 k inserted into thepipe 3 j. On the other hand, the inertgas supply sub-system 3 c includes areservoir tank 3 m for inert gas such as, for example, argon gas, a pipe connected between thereservoir tank 3 m and thereactor 3 a and an electromagnetic flow control valve 3 o inserted into thepipe 3 n. The electromagnetic flow control valve 3 o supplies the argon gas to theinlet nozzle 3 p at 0.2 to 0.5 litter per minute, and the argon gas is blown off into thereactor 3 a. Therotary vacuum pump 3 i evacuates the argon gas, and the electromagneticflow control valve 3 k maintains the argon gas in thereactor 3 a at 500 torr to 600 torr. - The
laser beam generator 3 d generates laser light, andradiates laser beams 3 r/ 3 s to thecarbon pellet 1 and themetal catalyst pellet 2, respectively. Thelaser beam generator 3 d includes a laser light emitting element formed of Nd contained single crystalline YAG (Yttrium Aluminum Garnet), and the laser light emitting element radiateslaser light pulses 3 r/ 3 s. The laser light has 532 nanometer wavelength, and oscillates at 10 Hz. The pulse width ranges from 7 nanoseconds to 10 nanoseconds, and the power is regulated to 1.2 to 9.2 J/pulse. Thelaser beams 3 r/ 3 s has cross section of 0.2 cm2. - The
heater 3 e heats thereactor 3 a, and thecontroller 3 h maintains the inside of thereactor 3 a around 1200 degrees in centigrade. Theheater 3 e may be implemented by an oven. - When the
carbon pellet 1, themetal catalyst pellet 2 and thelaser ablation system 3 are prepared, an operator inserts thecarbon pellet 1 and themetal catalyst pellet 2 into thereactor 3 a. Thecarbon pellet 1 and themetal catalyst pellet 2 symmetrically decline with respect to the center line of thereactor 3 a, and the major surface of thecarbon pellet 1 is opposed through thespacer 3 g to the concave surface of themetal catalyst pellet 2 as shown in FIG. 2. - The
reactor 3 a is closed, and therotary vacuum pump 3 i evacuates the air from thereactor 3 a. When the vacuum is developed in thereactor 3 a, the inertgas supply system 3 c supplies the argon gas at 0.5 litter/minute. The evacuatingsub-system 3 b cooperates with the inertgas supply system 3 c, and maintain the inside of thereactor 3 a at 600 mmHg. The argon gas flows from thenozzle 3 p toward thecollector 3 f. - Subsequently, the
laser beam generator 3 d radiates thelaser beams 3 r/ 3 s to thecarbon pellet 1 and themetal catalyst pellet 2. In this instance, the pulse width and the power are adjusted to 10 nanosecond and 50 mJ/pulse cm2. Thelaser beams 3 r/ 3 s directly heat thecarbon pellet 1 and themetal catalyst pellet 2, and carbon vapor/cluster 4 and nickel-cobalt vapor/cluster 5 are constantly generated from thecarbon pellet 1 and themetal catalyst pellet 2, respectively, as shown in FIG. 1B. - The argon gas carries the carbon vapor/cluster4 and the nickel-cobalt vapor/
cluster 5 toward thecollector 3 f. The carbon vapor/cluster 4 are mixed with the nickel-cobalt vapor/cluster 5, and forms into single-wall carbon nanotubes 6. The single-wall carbon nanotubes 6 are carried toward thecollector 3 f, and are captured by thecollector 3 f as shown in FIG. 1C. The carbon vapor/cluster 4 and the nickel-cobalt vapor/cluster 5 are constant in mass, and keeps the content of carbon in the condensate or the single-wall carbon nanotubes 6 constant. This results in the constant diameter of the single-wall carbon nanotubes 6. - As will be appreciated from the foregoing description, the
carbon pellet 1 and themetal catalyst pellet 2 are used in the process according to the present invention, and make the single-wall carbon nanotubes constant in diameter. - Although particular embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.
- It is required for the process according to the present invention to separately vaporize the carbon and the metal catalyst. However, this requirement does not means the carbon and the metal catalyst respectively formed into pellets. The carbon and the metal catalyst may be in the form of powder.
- The carbon pellet and the metal catalyst pellet may have a semi-column configuration.
Claims (16)
1. A process for producing carbon nanotubes, comprising the steps of:
a) preparing a source of carbon vapor and a source of catalyst vapor physically separated from each other;
b) radiating laser beams to said source of carbon vapor and said source of catalyst vapor so as to generate a carbon vapor/cluster and a catalyst vapor/cluster;
c) allowing said carbon vapor/cluster to be mixed with said catalyst vapor/cluster so as to form said carbon vapor/cluster into carbon nanotubes.
2. The process as set forth in , in which said source of carbon vapor and said source of catalyst vapor are provided as a carbon pellet and a catalyst pellet, respectively.
claim 1
3. The process as set forth in , in which said carbon pellet is formed of graphite, and said catalyst pellet is formed of material selected from the group consisting of nickel, cobalt, platinum, palladium and alloys containing at least two of said nickel, said cobalt, said platinum and said palladium.
claim 2
4. The process as set forth in , in which a spacer is provided between said carbon pellet and said catalyst pellet.
claim 2
5. The process as set forth in , in which a YAG laser forms said laser beams.
claim 1
6. The process as set forth in , in which said YAG laser forms laser pulse trains for said laser beams, respectively, and said laser pulse trains have a wavelength of 532 nanometers, a frequency of 10 Hz, a pulse width of 7 to 10 nanoseconds and a power of 1.2 to 9.1 J/pulse.
claim 5
7. The process as set forth in , in which a carrier gas flows through said source of carbon vapor and said source of catalyst vapor so as to mix said carbon vapor/cluster with said catalyst vapor/cluster in said step c).
claim 1
8. The process as set forth in , in which said carrier gas is an inert gas, and said inert gas flows at 0.2 to 0.5 litter per minute at 500 to 600 torr.
claim 7
9. The process as set forth in , in which said carbon vapor/cluster is formed into said carbon nanotubes at 1200 degrees in centigrade.
claim 1
10. A laser ablation system for producing carbon nanotubes, comprising:
a reactor having an air-tight chamber where a source of carbon vapor and a source of catalyst vapor are separately provided;
a laser beam generator provided for said reactor and radiating laser beams to said source of carbon vapor and said source of catalyst vapor for producing a carbon vapor/cluster and a catalyst vapor/cluster from said source of carbon vapor and said source of catalyst vapor, respectively;
an evacuating sub-system connected to said reactor for evacuating a gaseous mixture from said air-tight chamber;
a carrier gas supply sub-system connected to said reactor supplying carrier gas to said air-tight chamber for forming a carrier gas flow in said air-tight chamber; and
a collector provided in said carrier gas flow and capturing carbon nanotubes formed from said carbon vapor/cluster in the presence of said catalyst vapor/cluster and carried on said carrier gas flow.
11. The laser ablation system as set forth in , in which said reactor is formed of a material selected from the group consisting of quartz and ceramics.
claim 10
12. The laser ablation system as set forth in , in which said laser beam generator produces laser pulse trains from a YAG laser for said laser beams, and the laser pulse trains have a wavelength of 532 nanometers, a frequency of 10 Hz, a pulse width of 7 to 10 nanoseconds and a power of 1.2 to 9.1 J/pulse.
claim 10
13. The laser ablation system as set forth in , further comprising a heater for heating said air-tight chamber to at least 1200 degrees in centigrade.
claim 12
14. The laser ablation system as set forth in , in which a carbon pellet and a catalyst pellet serve as said source of carbon vapor and said source of catalyst vapor, respectively.
claim 10
15. The laser ablation system as set forth in , in which said catalyst pellet is formed of a material selected from the group consisting of nickel, cobalt, platinum, palladium and alloys containing at least two metals of said nickel, said cobalt, said platinum and said palladium.
claim 14
16. The laser ablation system as set forth in , in which said carrier gas supply system includes a source of inert gas, and said evacuating sub-system and said carrier gas supply system cooperate with each other so as to flow an inert gas at 0.2 to 0.5 litter per minute at 500 to 600 torr in said air-tight chamber.
claim 10
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6422450B1 (en) * | 1999-03-01 | 2002-07-23 | University Of North Carolina, The Chapel | Nanotube-based high energy material and method |
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-
1997
- 1997-12-22 JP JP09352833A patent/JP3077655B2/en not_active Expired - Fee Related
-
1998
- 1998-10-23 US US09/177,790 patent/US20010001654A1/en not_active Abandoned
-
2000
- 2000-05-03 US US09/562,959 patent/US6331690B1/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US6422450B1 (en) * | 1999-03-01 | 2002-07-23 | University Of North Carolina, The Chapel | Nanotube-based high energy material and method |
US20040247515A1 (en) * | 2003-06-05 | 2004-12-09 | Lockheed Martin Corporation | Pure carbon isotropic alloy of allotropic forms of carbon including single-walled carbon nanotubes and diamond-like carbon |
US7097906B2 (en) | 2003-06-05 | 2006-08-29 | Lockheed Martin Corporation | Pure carbon isotropic alloy of allotropic forms of carbon including single-walled carbon nanotubes and diamond-like carbon |
US20060237301A1 (en) * | 2003-08-08 | 2006-10-26 | Takeshi Azami | Apparatus for producing nanocarbon, method for producing nanocarbon and method for collecting nanocarbon |
Also Published As
Publication number | Publication date |
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JP3077655B2 (en) | 2000-08-14 |
US6331690B1 (en) | 2001-12-18 |
JPH11180707A (en) | 1999-07-06 |
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