WO2010050517A1 - カーボンナノチューブ形成方法 - Google Patents
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- WO2010050517A1 WO2010050517A1 PCT/JP2009/068516 JP2009068516W WO2010050517A1 WO 2010050517 A1 WO2010050517 A1 WO 2010050517A1 JP 2009068516 W JP2009068516 W JP 2009068516W WO 2010050517 A1 WO2010050517 A1 WO 2010050517A1
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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
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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
Definitions
- the present invention relates to a carbon nanotube forming method suitable for forming carbon nanotubes on a conductor covering a part of a substrate in a short heating time.
- Non-Patent Document 1 discloses a technique for growing carbon nanotubes by forming a Cr and Co layer on the entire substrate surface and irradiating with microwaves.
- Non-Patent Document 2 discloses a technique for growing a single-walled carbon nanotube (SWNT) in a short time using an Fe / Al 2 O 3 catalyst.
- Non-Patent Document 3 discloses a technique of heating at 400 ° C. for 30 minutes in a carbon source gas atmosphere in order to form carbon nanotubes on a substrate.
- Non-Patent Document 3 carbon nanotubes are grown at a low temperature of 400 ° C. in consideration of the heat resistance of the substrate, but the growth time is as long as 30 minutes, so it is necessary to form carbon nanotubes. There is also a desire to shorten the time.
- the present invention solves the above-described problems, and an object of the present invention is to provide a carbon nanotube forming method suitable for forming carbon nanotubes on a conductor covering a part of a substrate in a short heating time.
- the carbon nanotube formation method includes a conductive member placement step, a catalyst placement step, a substrate placement step, and a heating step, and is configured as follows.
- the conductive member is arranged so as to cover a part of the surface of the substrate.
- a catalyst is placed on the placed conductive member.
- the substrate on which the catalyst is arranged is placed in a carbon source gas atmosphere.
- the conductive member disposed on the substrate placed in the carbon source gas atmosphere is heated for a short time to grow carbon nanotubes from the catalyst.
- the conductive member in the carbon nanotube formation method of the present invention, is disposed in a linear shape, a comb shape, or a mesh shape to cover 0.1% to 50% of the surface of the substrate. It can be constituted as follows.
- conductive thin wires having a width of 1 ⁇ m to 50 ⁇ m are arranged in a linear shape, a comb shape, or a mesh shape with an interval of 10 ⁇ m to 500 ⁇ m. Can do.
- the conductive member arranging step Mo is linearly arranged as a conductive member, and in the catalyst arranging step, Al 2 O 3 is used as a catalyst carrier so as to contact the conductive member. It is possible to arrange such that Fe or Co is used as a catalyst so as to be in contact with the catalyst carrier.
- the heating step can be configured to heat the conductive member for a short time of 10 seconds or less.
- the conductive member in the heating step, can be heated by energizing the conductive member in a pulse shape.
- the conductive member in the heating step, can be heated by irradiating the conductive member with electromagnetic waves in a pulsed manner.
- 1 is a partial cross-sectional view showing a first embodiment of a surface light emitting device using carbon nanotubes. It is a fragmentary sectional view which shows 2nd Embodiment of the surface emitting device using a carbon nanotube.
- FIG. 1 is a partial cross-sectional view of a liquid crystal display panel using a surface light emitting device using carbon nanotubes.
- a description will be given with reference to FIG.
- the liquid crystal display 10 has a structure in which a surface light emitting device 11, a polarizing filter 12, a transparent electrode 13, a liquid crystal 14, a transparent electrode 15, a color filter 16, and a polarizing filter 17 are stacked in this order. .
- the light emitted from the surface light emitting device 11 is aligned through the polarization filter 12.
- the liquid crystal 14 functions as a shutter that determines whether light is allowed to pass by a voltage applied between the transparent electrode 13 and the transparent electrode 15.
- light that has passed through the liquid crystal 14 passes through a color filter 16 that constitutes a pixel corresponding to each of the three primary colors of light, passes through a polarizing filter 17, and is output to the outside.
- FIG. 2 is a partial cross-sectional view showing a first embodiment of a surface light emitting device using carbon nanotubes.
- a description will be given with reference to FIG.
- the carbon nanotube 104 extends from the conductive member 102 functioning as the cathode electrode toward the conductive planar body 103 functioning as the anode electrode.
- the carbon nanotube 104 functions as an emitter.
- a catalyst carrier 503 and a catalyst 504 are formed on the conductive member 102, and the carbon nanotubes 104 are grown from the surface of the catalyst 504.
- the catalyst carrier 503 covers the entire substrate 101 and the conductive member 102, and the catalyst 504 covers the entire catalyst carrier 503. However, as will be described later, by changing the manufacturing process, It is also possible to form the catalyst carrier 503 and the catalyst 504 only.
- the carbon nanotubes 104 are grown from the upper surface of the conductive member 102 in the surface of the catalyst 504.
- the conductive member 102 is not in the upper surface of the conductive member 102 but in the surface of the catalyst 504. It is also possible to grow the carbon nanotube 104 from a region corresponding to the vicinity of the edge of the.
- the surface of the carbon nanotube 104 can be overcoated with a thin protective layer.
- the carbon nanotube 104 may be gradually oxidized and damaged under the influence of an oxidant or the like generated from a small amount of residual water vapor or the like.
- a thin film having a thickness of about 1 nm to 5 nm is formed of a conductive material that is strong against oxidation and has a low surface tension, such as ZnO.
- the illustration of the protective layer is omitted for easy understanding. The same applies to the following embodiments and drawings.
- the light that travels downward in the figure is reflected by the back surface of the conductive planar body 103, so that all the light emitted from the surface light emitting device 11 is in the upper part of the figure. Will proceed to.
- the phosphor 105 side of the surface light emitting device 11 is in contact with the polarizing filter 12 of the liquid crystal display 10.
- FIG. 3 is a partial cross-sectional view showing a second embodiment of a surface light emitting device using carbon nanotubes.
- a description will be given with reference to FIG. The configuration in this figure is different from the configuration shown in FIG. 2 in the direction in which light is emitted.
- carbon nanotubes 104 extend from a conductive member 102 functioning as a cathode electrode toward a conductive planar body 103 functioning as an anode electrode.
- the carbon nanotube 104 functions as an emitter.
- the substrate 101 is made of a transparent material such as soda lime glass.
- a catalyst carrier 503 and a catalyst 504 are formed on the conductive member 102, and the carbon nanotubes 104 are grown from the surface of the catalyst 504.
- the light that travels downward in the figure is reflected by the surface of the conductive planar body 103, so that the light emitted from the surface light emitting device 11 proceeds upward in the figure, It passes through the gap between the conductive members 102 and the substrate 101.
- the manufacturing process is changed from that in FIG. 2 so that the catalyst carrier 503 and the catalyst 504 cover only the conductive member 102 (a part may protrude from the substrate 101). , Improve the light transmission.
- the light transparency can be improved by making the catalyst carrier 503 and the catalyst 504 thin and transparent. it can.
- the substrate 101 side of the surface light emitting device 11 is in contact with the polarizing filter 12 of the liquid crystal display 10.
- the conductive members 102 are arranged at a constant interval. Therefore, the interval at which the phosphor 105 emits light and the light output from the surface light emitting device 11 also have this interval as a spatial period.
- the pixel size of the liquid crystal 14 is set to an integral multiple of the interval between the conductive members 102, the illuminance with which each pixel is illuminated becomes uniform.
- the phosphors of these three primary colors are arranged at a constant period.
- the width of each phosphor is 100 ⁇ m, this width matches the period of the pixels of the liquid crystal 14.
- the interval between the conductive members 102 may be an interval obtained by dividing 100 ⁇ m by an integer, for example, 100 ⁇ m, 50 ⁇ m, 25 ⁇ m, 20 ⁇ m, or the like.
- FIG. 4 is an explanatory diagram showing an example of the shape of the conductive member 102 disposed on the substrate 101.
- a description will be given with reference to FIG.
- the conductive member 102 disposed on the substrate 101 includes a pad 401 to which a voltage is applied, a basic electrode 402 that transmits the applied voltage, and a number of thin wires 403 that connect the basic electrode 402.
- the basic electrode 402 and the thin wire 403 form an elongated mesh shape, and a slit 451 is formed by the gap.
- the width of the main electrode 402 can be appropriately determined according to the arrangement of pixels of the liquid crystal display device.
- An inexpensive material such as soda lime glass can be used for the substrate 101. Further, as the conductive member 102, it is typical to use Mo.
- the ratio of the area covered with the conductive member 102 in the substrate 101 is about 0.1% to 50%, typically 10% or less.
- the length of the thin wire 403, that is, the interval between the basic electrodes 402 is set to about 0.1 mm to 2 mm, and the width of the thin wire 403 is set to about 1 ⁇ m to 50 ⁇ m, typically 1 ⁇ m to 10 ⁇ m.
- the width of the slit 451 is about 10 ⁇ m to 500 ⁇ m, typically 10 ⁇ m to 100 ⁇ m.
- width, length, interval, and size can be appropriately changed according to the application, such as corresponding to the size of the pixel.
- both the pad 401 a on the right side of the figure and the pad 401 b on the left side of the figure serve as voltage application positions to the cathode electrode and maintain the same potential. Obviously, both the pad 401 a on the right side of the figure and the pad 401 b on the left side of the figure serve as voltage application positions to the cathode electrode and maintain the same potential. Obviously, both the pad 401 a on the right side of the figure and the pad 401 b on the left side of the figure serve as voltage application positions to the cathode electrode and maintain the same potential. Become.
- the conductive member 102 is conductive, it is not a perfect conductor, and therefore generates heat when a current is passed through the thin wire 403.
- this heat generation phenomenon is used to grow the carbon nanotubes 104 of the surface light emitting device 11.
- a method of applying a voltage between the pad 401a and the pad 401b or irradiating the conductive member 102 with a microwave can be considered.
- FIG. 5A, 5B, FIG. 5C, FIG. 5D, FIG. 5E, FIG. 5F, FIG. 5G, FIG. 5H, and FIG. 5I show the state of each stage of the process of forming the carbon nanotube 104 on the conductive member 102 of the substrate 101. It is a partial sectional view shown. Hereinafter, description will be given with reference to these drawings.
- a substrate 101 is prepared (FIG. 5A), and Mo is sputtered on the surface of the substrate 101 to form a conductive layer 501 (FIG. 5B).
- the thickness of the conductive layer 501 formed here is the thickness of the conductive member 102 and is typically about 10 nm to 100 nm.
- a resist 502 is applied to the surface of the conductive layer 501 (FIG. 5C), a mask pattern of the conductive member 102 as shown in FIG. 4 is formed and exposed (FIG. 5D), and the conductive layer 501 is etched. Then (FIG. 5E), the resist 502 is peeled off (FIG. 5F).
- Al 2 O 3 to be the catalyst carrier 503 is sputtered (FIG. 5G). As shown in the figure, the catalyst carrier 503 covers the entire substrate 101 and the conductive member 102.
- Fe or Co to be the catalyst 504 is sputtered (FIG. 5H).
- the catalyst 504 covers the entire catalyst carrier 503.
- the conductive member 102 when the conductive member 102 is disposed on the surface of the substrate 101, the catalyst carrier 503 is disposed on the surface of the conductive member 102, and the catalyst 504 is disposed on the surface of the catalyst carrier 503, the substrate 101 is placed on the C 2 H
- the conductive member 102 is placed in a gas atmosphere containing a carbon source such as 2 and the conductive member 102 is heated once in a pulse manner to perform CVD (Chemical Vapor Deposition).
- CVD Chemical Vapor Deposition
- the thin carbon nanotube 104 grows from the portion corresponding to the vicinity of the conductive member 102 on the surface of the catalyst 504 (FIG. 5I).
- the heating method is typically performed by applying a voltage in a pulsed manner between the pad 401a and the pad 401b in the conductive member 102 and causing a current to flow through the thin wire 403.
- an electromagnetic wave such as a microwave is used. Heating is also possible by irradiating the conductive member 102 in a pulsed manner.
- the heating temperature, time, and concentration of the carbon source gas can be determined by applying the technique disclosed in Non-Patent Document 2, and the carbon nanotube 104 can be preliminarily set so that the fineness and length of the carbon nanotube 104 are within a desired range. It can be determined by conducting an experiment. Typically, the heating is performed for a short time of about 0.01 seconds to 10 seconds.
- the conductive member 102, the catalyst carrier 503, and the catalyst 504 are rapidly heated to high temperatures, but the substrate 101 is thick and has low thermal conductivity. When the heating time is short as described above, the substrate 101 is practically not deteriorated by heating.
- a thin layer having a thickness of about 1 nm to 5 nm of a conductive material that is strong in oxidation such as ZnO and has a small surface tension is formed on the surface of the carbon nanotube 104 and, typically, other It is also possible to adopt a method of forming a protective layer against oxidation / damage by forming it on the exposed surface.
- the carbon nanotubes 104 formed here are different from the thick ones used in the conventional surface light emitting devices, and typically have a structure in which thin carbon nanotubes of single to three layers are intertwined. . In this case, since the tip of the carbon nanotube 104 is sharp, electric field concentration occurs, and the voltage applied between the anode electrode and the cathode electrode can be low when generating surface emission.
- the distance between the anode electrode and the cathode electrode can be reduced (typically, about 0.1 ⁇ m to 100 ⁇ m), and high resolution can be realized.
- the distance between the anode electrode and the cathode electrode can be set to 1 ⁇ m or less.
- the pressure is from 1 kPa to atmospheric pressure.
- the conductive layer 501 is formed, the resist 502 is applied, the etching is performed to form the pattern of the conductive member 102, the resist 502 is peeled off, and then the catalyst carrier 503 and the catalyst 504 are removed. Although this was sputtered, this order can be changed as appropriate.
- the conductive layer 501 is formed, the same material as the catalyst carrier 503 is sputtered to form a layer, the same material as the catalyst 504 is sputtered to form a layer, and then a resist 502 is applied and etched. It is also possible to adopt a procedure in which the resist 502 is peeled after the patterns of the conductive member 102, the catalyst carrier 503, and the catalyst 504 are formed. In this case, the catalyst carrier 503 and the catalyst 504 are arranged in the same pattern as the conductive member 102, and a part of the substrate 101 is exposed.
- a resist 502 is applied and etching is performed to form a pattern of the conductive member 102 and the catalyst carrier 503. Then, a procedure of peeling the resist 502 and sputtering the catalyst 504 may be employed.
- the catalyst carrier 503 is arranged in the same pattern as the conductive member 102, but the catalyst 504 covers the substrate 101.
- the carbon nanotubes can be used as long as they are in contact with each other. 104 can be grown.
- FIG. 6 is a SEM (Scanning Electron Microscope) photograph showing the state of the carbon nanotube 104 grown on the thin wire 403 of the conductive member 102 by pulse heating CVD for 1 second in the above technique. . Note that the reference numerals are omitted.
- the thin line 403 has a width of about 3 ⁇ m, and the carbon nanotube 104 grows on the thin line 403 at the right and left ends of the photograph and on the thin line 403 in the center of the photograph.
- the shape on the thin line 403 is high such as “hill” or “plateau”.
- the length of the carbon nanotube 104 is about 0.5 ⁇ m to 1.0 ⁇ m, and can sufficiently function as the emitter of the surface light emitting device 11.
- the grown carbon nanotubes 104 are extremely thin. That is, it has a structure in which thin carbon nanotubes of single to three layers are intertwined.
- FIG. 7 is an SEM photograph showing a state of the carbon nanotube 104 grown on the thin wire 403 of the conductive member 102 by pulse heating CVD for 1 second under conditions different from those in FIG. Note that the reference numerals are omitted.
- the thin line 403 is arranged at the center of the screen, has a width of about 2 ⁇ m, and other specifications are the same as those in FIG.
- the degree of growth of the carbon nanotubes 104 is significantly different between the portion where the fine line 403 at the right and left ends of the photograph is not arranged and the fine line 403 at the center of the photograph. ”And“ Gorge ”.
- the growth of the carbon nanotube is about 0.1 ⁇ m, but in the region sandwiching the thin wire 403, the growth of the carbon nanotube is about 0.7 ⁇ m to 0.9 ⁇ m.
- the temperature at which the thin wire 403 is heated is higher than in the case of FIG. For this reason, it is considered that the temperature of the region not on the fine line 403 in the vicinity of the fine line 403 of the catalyst 504 has become a temperature suitable for the growth of the carbon nanotube 104. In this aspect, since the corners of the aggregate of the carbon nanotubes 104 are sharp, it is considered that the emission characteristics are good.
- FIG. 8 is an explanatory diagram showing the growth of the carbon nanotube 104 suitable for a certain application.
- a description will be given with reference to FIG.
- the length and density of the carbon nanotubes 104 are exaggerated for easy understanding. However, depending on the application, including the field emission, the density of the carbon nanotubes 104 is somewhat sparse. In some cases, it may be desirable. In the example shown in this figure, the carbon nanotubes 104 are formed sparsely, and electric field concentration can be realized efficiently.
- the catalyst It is possible to adjust the position where the carbon nanotube 104 grows on the surface 504 (whether it is on the fine line 403 or a region outside the fine line 403).
- FIG. 9 is an SEM photograph showing the appearance of the grown carbon nanotubes. This corresponds to an example of the carbon nanotube 104 shown in FIG.
- a description will be given with reference to FIG.
- the interval between the thin wires 403 (regions with “conductive member” in the drawing) of the conductive member 102, that is, the width of the slit 451 (region without “conductive member” in the drawing) is 20 ⁇ m
- the carbon nanotube 104 is grown under a predetermined condition.
- the conductive members 102 are close to each other, and the region of the slit 451 is heated, so that the carbon nanotube 104 grows not in the conductive member 102 but in the vicinity thereof. is doing.
- the temperature of the conductive member 102 is lower than that in the above case, so that the carbon nanotubes are grown on the conductive member 102.
- the conductive member 102 was laminated with a Mo thickness of 100 nm
- the catalyst carrier 503 was laminated with an Al 2 O 3 thickness of 20 nm
- the catalyst 504 was laminated with a thickness of 1 nm.
- the width of the thin wire 403 was 2 ⁇ m
- the length was 2 mm
- the space (Space) between the thin wires 403 was 20 ⁇ m, 50 ⁇ m, 100 ⁇ m, and 200 ⁇ m.
- a mixed gas of 4 Torr ( ⁇ 533 Pa) for C 2 H 2 , 200 Torr ( ⁇ 26.6 kPa) for H 2, and 556 Torr ( ⁇ 74.1 kPa) for Ar was used.
- the conductive member 102 was heated by applying a voltage of 100 V for 2 seconds.
- the thickness of the phosphor 105 is about 10 ⁇ m
- the distance between the substrate 101 and the phosphor 105 is 150 ⁇ m
- the reflection type mode shown in FIG. 3 is adopted
- the surface emitting device 11 is prototyped
- the atmospheric pressure is 0.7.
- An AC voltage (Voltage) with a duty ratio of 1 ⁇ 2 and a frequency of 100 Hz was applied between the anode electrode and the cathode electrode under ⁇ 10 ⁇ 5 Pa, and the state of light emission was examined.
- FIG. 10 is a photograph of the light emission state of the surface light emitting device 11 formed in this way.
- FIG. 11 is a graph showing the relationship between the voltage applied to the surface light emitting device 11 and the current.
- the brightness of light emission is highest when the interval (Space) between the thin lines 403 is 20 ⁇ m, and the applied voltage (Voltage) is highest when the voltage is 500V.
- the voltage (Voltage / V) for obtaining the highest current (Current / ⁇ A) is 500 V in the graph shown in FIG. In this case, the current is about 400 ⁇ A.
- the temperatures reached as a result are 812K, 825K, 880K and 910K, respectively.
- the substrate 101 was not cracked, but at 3.0 MW / m 2 , the conductive member 102 was lifted from the substrate 101, and at 3.2 MW / m 2 , Cracking occurred.
- the carbon nanotubes 104 did not grow at 2.4MW / m 2, 2.6MW / m 2, 3.0MW / m 2, the growth in the 3.2 MW / m 2 was observed.
- the initial heat quantity should be 2.6 MW / m 2 .
- APC PD200 high strain point glass
- the temperatures reached as a result are 900K, 1050K, and 1190K, respectively.
- the emitters when the state of light emission was examined for each of the four types of growth of the carbon nanotubes 104 shown in FIG. 9, the emitters at intervals of 20 ⁇ m and 50 ⁇ m at which the carbon nanotubes 104 were grown around the conductive member 102. It has been experimentally found that the light emission performance is higher than that of the emitters with intervals of 100 ⁇ m and 200 ⁇ m in which the carbon nanotubes 104 are grown on the conductive member 102.
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Abstract
Description
11 面発光装置
12 偏光フィルタ
13 透明電極
14 液晶
15 透明電極
16 カラーフィルタ
17 偏光フィルタ
101 基板
102 導電性部材
103 導電性面状体
104 カーボンナノチューブ
105 蛍光体
401 パッド
402 基幹電極
403 細線
451 スリット
501 導電性層
502 レジスト
503 触媒担体
504 触媒
Claims (7)
- 基板(101)の表面の一部を覆うように導電性部材(102)を配置する導電性部材配置工程、
前記配置された導電性部材(102)上に触媒(504)を配置する触媒配置工程、
前記触媒(504)が配置された基板(101)を炭素源ガス雰囲気に置く基板設置工程、
前記炭素源ガス雰囲気に置かれた基板(101)に配置された導電性部材(102)を短時間加熱し、前記触媒(504)からカーボンナノチューブ(104)を成長させる加熱工程
を備えることを特徴とするカーボンナノチューブ形成方法。 - 請求項1に記載のカーボンナノチューブ形成方法であって、
前記導電性部材配置工程では、前記導電性部材(102)を線状、櫛形、あるいは、メッシュ状に配置することにより、前記基板(101)の表面の0.1パーセント乃至50パーセントを覆う
ことを特徴とするカーボンナノチューブ形成方法。 - 請求項2に記載のカーボンナノチューブ形成方法であって、
前記導電性部材配置工程では、幅1μm乃至50μmの導電性細線(403)を、間隔10μm乃至500μmで線状、櫛形、あるいは、メッシュ状に配置する
ことを特徴とするカーボンナノチューブ形成方法。 - 請求項3に記載のカーボンナノチューブ形成方法であって、
前記導電性部材配置工程では、Moを前記導電性部材(102)として線状に配置し、
前記触媒配置工程では、Al2O3を触媒担体(503)として前記導電性部材(102)に接するように配置し、FeもしくはCoを前記触媒(504)として、前記触媒担体(503)に接するように配置する
ことを特徴とするカーボンナノチューブ形成方法。 - 請求項1に記載のカーボンナノチューブ形成方法であって、
前記加熱工程では、前記導電性部材(102)を10秒以下の短時間加熱する
ことを特徴とするカーボンナノチューブ形成方法。 - 請求項5に記載のカーボンナノチューブ形成方法であって、
前記加熱工程では、前記導電性部材(102)をパルス状に通電することにより前記導電性部材(102)を加熱する
ことを特徴とするカーボンナノチューブ形成方法。 - 請求項5に記載のカーボンナノチューブ形成方法であって、
前記加熱工程では、前記導電性部材(102)にパルス状に電磁波を照射することにより前記導電性部材(102)を加熱する
ことを特徴とするカーボンナノチューブ形成方法。
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US9793089B2 (en) | 2013-09-16 | 2017-10-17 | Kla-Tencor Corporation | Electron emitter device with integrated multi-pole electrode structure |
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US20140037493A1 (en) * | 2011-11-23 | 2014-02-06 | Hyundai Motor Company | Casting aluminum alloy with dispersed cnt and method for producing the same |
CN109665512A (zh) * | 2019-01-21 | 2019-04-23 | 中国科学院成都有机化学有限公司 | 一种多壁碳纳米管的制备方法 |
Also Published As
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US20110189394A1 (en) | 2011-08-04 |
KR101268625B1 (ko) | 2013-05-29 |
JP2010105845A (ja) | 2010-05-13 |
JP5246765B2 (ja) | 2013-07-24 |
KR20110057256A (ko) | 2011-05-31 |
US8435601B2 (en) | 2013-05-07 |
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