US20020197752A1 - Carbon nanotube field emission array and method for fabricating the same - Google Patents
Carbon nanotube field emission array and method for fabricating the same Download PDFInfo
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- US20020197752A1 US20020197752A1 US10/191,492 US19149202A US2002197752A1 US 20020197752 A1 US20020197752 A1 US 20020197752A1 US 19149202 A US19149202 A US 19149202A US 2002197752 A1 US2002197752 A1 US 2002197752A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/30—Cold cathodes, e.g. field-emissive cathode
- H01J1/304—Field-emissive cathodes
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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
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes
-
- 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
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
-
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2201/00—Electrodes common to discharge tubes
- H01J2201/30—Cold cathodes
- H01J2201/304—Field emission cathodes
- H01J2201/30446—Field emission cathodes characterised by the emitter material
- H01J2201/30453—Carbon types
- H01J2201/30469—Carbon nanotubes (CNTs)
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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
- Y10S977/70—Nanostructure
- Y10S977/734—Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
- Y10S977/742—Carbon nanotubes, CNTs
- Y10S977/743—Carbon nanotubes, CNTs having specified tube end structure, e.g. close-ended shell or open-ended tube
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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
- Y10S977/70—Nanostructure
- Y10S977/832—Nanostructure having specified property, e.g. lattice-constant, thermal expansion coefficient
- Y10S977/833—Thermal property of nanomaterial, e.g. thermally conducting/insulating or exhibiting peltier or seebeck effect
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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
Definitions
- the present invention relates to a field emission array (FEA) using carbon nanotubes having characteristics of low work function, durability and thermal stability, and a method for fabricating the same.
- FEA field emission array
- Carbon nanotubes which were developed in 1991, are similar to fulleren (C 6 O). Since they have an excellent electron emission characteristic and chemical and mechanical durability, their physical properties and applications have steadily been studied.
- a Spind't-type field emission emitter which is generally used for field emission displays, is composed of an emitter for emitting electrons and a gate for facilitating the emission of electrons.
- the emitter has a problem in that the life span of a tip is shortened due to atmosphere gases or a non-uniform electric field during operation.
- a work function must be decreased to decrease the driving voltage, but there are limitations.
- fabrication of an electron emission source using carbon nanotubes which have a substantially high aspect ratio, an excellent durability due to their structure similar to that of C 6 O, and an excellent electron conductivity has been studied.
- FIG. 1 is a schematic exploded perspective view of a field emission device using conventional carbon nanotubes which are disclosed in Appl. Phys. Lett., Vol. 72, No. 22, Jun. 1, 1998.
- the field emission device using the conventional carbon nanotubes includes a front substrate 1 and a rear substrate 11 facing each other and anodes 2 and cathodes 12 which are formed on the front and rear substrates 1 and 11 , respectively, in a striped pattern such that the anodes 2 cross the cathodes 12 .
- the cathodes 12 are formed of carbon nanotubes in a structure in which grooves are formed on the rear substrate 11 in a striped pattern and the grooves are filled with a carbon nanotube-epoxy mixture.
- the anodes 2 are formed of an ITO film coated with phosphors.
- FIG. 2A shows the steps of a method of fabricating the cathodes 12 on the rear substrate 11 of the field emission device of FIG. 1 using carbon nanotubes.
- FIG. 2B shows the steps of a method of fabricating the anodes 2 on the front substrate 1 of the field emission device of FIG. 1 using carbon nanotubes.
- grooves 12 a are formed in a striped pattern on a glass substrate 11 ′, as shown in (a) of FIG. 2A.
- a carbon nanotube-epoxy mixture 12 ′ is deposited, as shown in (c) of FIG. 2A.
- the surface of the resulting structure is planarized to complete the cathodes 12 , as shown in (d) of FIG. 2A.
- an ITO film 2 ′ is deposited on the glass substrate 1 , as shown in (a) of FIG. 2B.
- the ITO film 2 ′ is etched in a striped pattern to form the anodes 2 .
- the anodes 2 are coated with phosphors 3 .
- an object of the present invention is to provide a field emission array using carbon nanotubes, which can be easily aligned and closely contacts cathodes, and a method for fabricating the same.
- the present invention provides a field emission array using carbon nanotubes.
- the field emission array includes front and rear substrates facing each other and separated by a predetermined distance; anodes and cathodes formed on the front and rear substrates facing each other, respectively, in a striped pattern, the anodes and the cathodes crossing each other; carbon nanotubes fixed on the cathodes corresponding to intersections between the cathodes and the anodes; and a metal fuser element for fixing the carbon nanotubes on the cathodes and conducting currents between the cathodes and the carbon nanotubes.
- the field emission array also includes an insulating layer deposited on the cathodes around the carbon nanotubes and the rear substrate, and gates formed on the insulating layer in a striped pattern to be parallel to the anodes.
- Each of the anodes is formed of an ITO film and coated with phosphor.
- the present invention also provides a method of fabricating a field emission array using carbon nanotubes.
- the method includes the steps of: (a) forming cathodes on a rear substrate in a striped pattern; (b) printing a mixture of carbon nanotubes, metal powder and organic binder on predetermined areas of the cathodes; (c) vaporizing the organic binder by sintering the mixture and anchoring the carbon nanotubes on the cathodes by diffusing the metal powder; and (d) combining a front substrate, on which anodes are formed in a striped pattern, with the rear substrate having the cathodes on which the carbon nanotubes are anchored.
- the method also includes the steps of: forming an insulating layer on the tops of the cathodes other than portions to which the carbon nanotubes are to be adhered and on the top of the exposed rear substrate, before the step (b); and forming gates on the insulating layer after the step (c).
- the metal powder is composed of metal particles of a metal, selected from the group consisting of Ag, Al, Ni, Cu and Zn, having a diameter of 0.1-10 ⁇ m and is diffused at a temperature of 250-500° C.
- the metal powder is melted at a low temperature of 100-350° C.
- the mixture is sintered to evaporate the organic binder, and the low melting point metal powder is melted to anchor the carbon nanotubes on the cathodes.
- the metal powder is preferably composed of particles of a metal selected from the group consisting of Pb, In, InSn, PbSn, AuSn and a metal alloy thereof.
- the organic binder is composed of at least one selected from the group consisting of ⁇ -terpineol, ethyl cellulose and butyl carbitol acetate, and the printing is performed by an extrusion method using a filter for aligning the carbon nanotubes.
- the printing is performed by a screen printing method using a metal mesh screen which is patterned for aligning the carbon nanotubes.
- the sintering is performed at a temperature of 200-500° C.
- FIG. 1 is a schematic exploded perspective view of a field emission device using conventional carbon nanotubes
- FIG. 2A shows the steps of a method of fabricating cathodes on a rear substrate of the carbon nanotube field emission device of FIG. 1;
- FIG. 2B shows the steps of a method of fabricating anodes on a front substrate of the carbon nanotube field emission device of FIG. 1;
- FIG. 3A is a plan view of a field emission array using carbon nanotubes according to the present invention.
- FIG. 3B is a sectional view of FIG. 3A taken along the line A-A′;
- FIGS. 4A through 4D are sectional views illustrating the steps of a method of fabricating a field emission array using carbon nanotubes according to the present invention.
- FIG. 5 is a sectional view of an apparatus which has a filter for alignment of carbon nanotubes and is used when a pressing method is used during the steps of FIGS. 4A through 4D;
- FIGS. 6A through 6C show pressing steps using a filter formed of ceramic (alumina) when an insulating layer is not formed in the case of FIG. 5;
- FIGS. 7A through 7E are plan and sectional views illustrating the structure of a screen printer in which a mask is combined with a mesh screen formed of stainless wires during the steps of FIGS. 4A through 4D;
- FIG. 7A is a sectional view illustrating a step of putting a screen printer on a rear substrate having cathodes and performing printing;
- FIG. 7B is a plan view of the mesh screen woven with stainless wires in the screen printer
- FIG. 7C is an enlarged view of the mesh structure of part A of FIG. 7B;
- FIG. 7D is a sectional view of FIG. 7C taken along the line B-B′;
- FIG. 7E is a sectional view of the structure of a completed rear substrate on which carbon nanotubes are metal fused to cathodes by firing and gates are formed on an insulating layer, after finishing the printing shown in FIGS. 7A through 7D;
- FIG. 8A is a sectional view of the whole rear substrate with a dual-layer gate plate, which is previously manufactured;
- FIG. 8B is a perspective view of the whole gate plate of FIG. 8A;
- FIG. 9 is a photograph (4 ⁇ 80 mm) showing the electron emission characteristic of carbon nanotubes which are fabricated by screen printing;
- FIG. 10 is a current-electric field graph showing the electron emission characteristic of a field emission array using carbon nanotubes according to the present invention.
- FIG. 11 is a luminance-electric field graph showing the electron emission luminance characteristic of a field emission array using carbon nanotubes according to the present invention.
- FIG. 12 is a photograph showing the electron emission of a field emission array using carbon nanotubes according to the present invention.
- a field emission array using carbon nanotubes according to the present invention is characterized in that carbon nanotubes and metal power are adhered to cathodes with an organic matter, and then the carbon nanotubes are fused to the cathodes by evaporating the organic matter and melting the metal powder.
- the present invention can be adopted in any multi-electrode tube structure of a field emission array as well as a diode structure having an anode and a cathode and a triode structure having an anode, a cathode and a gate.
- carbon nanotubes are fused to cathodes and substitute for microtips for emitting electrons.
- a triode field emission array will be described in detail with reference to FIGS. 3A and 3B.
- a field emission array using carbon nanotubes includes a front substrate 101 and a rear substrate 111 facing each other and anodes 102 and cathodes 112 which are formed on the front and rear substrates 101 and 111 , respectively, in a striped pattern such that the anodes 102 cross the cathodes 112 .
- Carbon nanotubes 112 a are fused to the cathodes 112 using a metal fuser element 112 b.
- An insulating layer 113 is provided on the rear surface 111 and the part of the cathodes 112 other than the part of the cathodes 112 to which the carbon nanotubes 112 a are fused.
- Gates 114 are formed on the insulating layer 113 in a striped pattern.
- Each of the anodes 102 is formed of an ITO film, and the entire surface of each anode 102 is coated with phosphor 103 .
- the cathodes 112 are formed on the rear substrate 111 in a striped pattern, as shown in FIG. 4A (referred to as step X).
- the insulating layer 113 is formed on the exposed rear substrate 111 and the part of the cathodes 112 other than the part to which carbon nanotubes are fixed.
- a mixture 112 a and 112 b of carbon nanotubes, metal powder and organic binder is printed on predetermined areas of the cathodes 112 through insulating layer opening portions 112 c over the cathodes 112 (referred to as step Y).
- the insulating layer 113 may be formed, but does not need to be formed.
- the mixture 112 a and 112 b is sintered to evaporate the organic binder, and the metal powder is melted or diffused to adhere the carbon nanotubes 112 a to the cathodes 112 (referred to as step Z).
- the front substrate 101 on which the anodes 102 are formed in a striped pattern, is combined with the rear substrate 111 having the cathodes 112 , to which the carbon nanotubes 112 a are fused, spaced apart by a predetermined distance, thereby completing the array.
- the step Y of self-aligning carbon nanotubes is particularly difficult.
- the present invention proposes two methods of aligning carbon nanotubes.
- a first method as shown in FIG. 5 or FIGS. 6A through 6C, after diffusing carbon nanotubes, a mixture 120 of an organic binder and powder of a low-melting point metal such as aluminum, silver, zinc or copper is squeezed into holes 130 a in a filter formed of glass such that the mixture 120 is injected into the holes 112 c in the insulating layer 113 , which are aligned with a predetermined pixel size.
- the organic binder is heated to be evaporated, and the metal powder is melted to fix the carbon nanotubes.
- a mixture of low-melting point metal powder and an organic binder is pressed on electrodes by a screen printing method using a metal mesh screen 160 a which is patterned on a substrate of an insulating material, so that the carbon nanotubes can be aligned and fixed.
- metal powder in which the diameters of the particles are about 0.1-10 ⁇ m when making a mixture for adhering carbon nanotubes.
- an insulating layer is essential. To prevent damage on an insulating layer during sintering after printing of the mixture, metal must easily melt at low temperature. Accordingly, a low-melting point metal powder, which is melted at a lower temperature than a temperature at which the insulating layer is formed, should be used. Since the insulating layer is generally formed at about 450-570° C., it is preferable to use a metal which is diffused at 250-500° C. or melted at 100-350° C. for metal powder.
- Silver (Ag), aluminum (Al), nickel (Ni), copper (Cu) and zinc (Zn) can be used as the metal which is diffused at 250-500° C.
- Pb, In, InSn, PbSn and AuSn can be used as the metal which is melted at 100-350° C.
- ⁇ -terpineol, ethyl cellulose or butyl carbitol acetate may be used. In mixing, the mixture is completely mixed by grinding source materials.
- an apparatus with a filter 130 for alignment of carbon nanotubes is used.
- a mixture 120 for printing is injected into a cylinder 140 with the filter 130 and firmly pressed with a piston 150 , the mixture 120 passes through the holes 130 a on the filter 130 and is applied to the cathodes 112 exposed by the opening portions 112 c on the insulating layer 113 while vertically aligning carbon nanotubes contained in the mixture 120 .
- a mixed paste is extruded through a ceramic (or glass) filter with holes of a pixel size, and thus aligned on cathodes.
- an organic binder is evaporated by heat treatment at low temperature (200-500° C.), and metal powder is sintered to fix carbon nanotubes in the holes of an insulating layer.
- FIGS. 6A through 6C show a process of pressing carbon nanotubes through a filter formed of ceramic (alumina) when an insulating layer is not formed. Carbon nanotubes, which are extruded through holes on the filter and aligned, are pressed on patterned metal films (cathodes) to be fixed.
- FIG. 6A shows a state in which a mixture for printing is injected into the holes 130 a of the ceramic (alumina) filter 130 .
- FIG. 6B shows a state in which the holes 130 a of the filter 130 are aligned on the cathode 112 lines on the rear substrate 111 without an insulating layer.
- FIG. 6C shows a state in which carbon nanotubes 112 a are adhered by printing the mixture on predetermined areas of the cathodes 112 through pressing and sintering.
- a screen printer 160 in which a mesh screen 160 a formed of stainless steel wires is combined with a mask 160 b, is used. More specifically, as shown in FIG. 7A, after laying the screen printer 160 on the rear substrate 111 having the cathodes 112 , a roller (not shown) to which a mixture for printing is applied is rolled on the screen printer 160 .
- FIG. 7B is a plan view of the mesh screen 160 a woven with stainless steel wires in the screen printer 160 .
- FIG. 7C is an enlarged view of the mesh structure of part A of FIG. 7B.
- FIG. 7D is a sectional view of FIG. 7C taken along the line B-B′.
- the screen printer 160 includes the screen which is made by weaving a mesh comprising warp threads 161 and weft threads 162 and the mask 160 b for making the mixture injected only into predetermined areas.
- FIG. 7E shows the structure of the completed rear substrate 111 , on which the carbon nanotubes 112 a are fused to the cathodes 112 by melted metal powder and gates 114 are formed on the insulating layer 113 , after finishing the printing of the mixture by the screen printing scheme.
- the gates 114 are formed by depositing a metal on the SiO 2 insulating layer 113 and patterning the deposited metal using a photolithography method.
- a gate plate 170 which is prepared in advance, as shown in FIG.
- FIG. 8A may be bonded onto the insulating layer 113 to complete a device.
- FIG. 8B is a perspective view illustrating the whole appearance of the gate plate 170 .
- the gate plate 170 is formed by depositing a gate 170 b formed of a conductor on a substrate 170 a formed of an insulating material.
- FIG. 9 is a photograph (40 ⁇ 80 mm) showing the electron emission characteristic of carbon nanotubes which are fabricated by screen printing.
- FIG. 10 is a current-electric field graph showing the electron emission characteristic of the carbon nanotubes.
- FIG. 11 is a luminance-electric field graph showing the electron emission luminance characteristic of the carbon nanotubes.
- FIG. 12 is a photograph showing the electron emission of the carbon nanotubes.
- the front substrate is coated with phosphor in such a manner that each anode of a pixel size is coated with red, green or blue phosphor. Thereafter, the front and rear substrates are packaged in vacuum to constitute a display.
- a cathode structure to which carbon nanotubes are fused according to the present invention can be used as a cathode for super high frequency microwave.
- a field emission array uses carbon nanotubes as electron emission sources, thereby lowering a work function and dropping driving voltage. Consequently, the present invention allows a device to be driven at low voltage.
- the present invention improves resistance to gases, which are generated during the operation of a device, thereby increasing the lifetime of an emitter, and substantially discharging heat, which is generated during the operation, thereby making epoch-making improvement in the performance of the filed emitter.
- the present invention allows emission of high density electrons by using an extremely microscopic electron emission source. Consequently, the present invention can be widely adopted, for example, in high frequency electron oscillators and displays driven at low voltage, as a next generation high density electron emission source.
- the present invention uses room temperature deposition and low temperature heat treatment for fabricating an electron emission source emitter of carbon nanotubes, and uses screen printer as a fabricating apparatus, thereby simplifying the fabrication process.
Abstract
A field emission array (FEA) using carbon nanotubes having characteristics of low work function, durability and thermal stability, and a method for fabricating the same are provided. The field emission array uses carbon nanotubes as electron emission sources, thereby lowering a work function and dropping driving voltage. Accordingly, a device can be driven at low voltage. In addition, resistance to gases, which are generated during the operation of a device, is improved, thereby increasing the life span of an emitter. The method prints a mixed paste using extrusion or screen printing and performs sintering, thereby fusing carbon nanotubes such that the carbon nanotubes are aligned in a single direction.
Description
- 1. Field of the Invention
- The present invention relates to a field emission array (FEA) using carbon nanotubes having characteristics of low work function, durability and thermal stability, and a method for fabricating the same.
- 2. Description of the Related Art
- Carbon nanotubes, which were developed in 1991, are similar to fulleren (C6O). Since they have an excellent electron emission characteristic and chemical and mechanical durability, their physical properties and applications have steadily been studied.
- A Spind't-type field emission emitter, which is generally used for field emission displays, is composed of an emitter for emitting electrons and a gate for facilitating the emission of electrons. The emitter has a problem in that the life span of a tip is shortened due to atmosphere gases or a non-uniform electric field during operation. In addition, with such conventional metal emitter, a work function must be decreased to decrease the driving voltage, but there are limitations. To overcome this problem, fabrication of an electron emission source using carbon nanotubes which have a substantially high aspect ratio, an excellent durability due to their structure similar to that of C6O, and an excellent electron conductivity has been studied.
- FIG. 1 is a schematic exploded perspective view of a field emission device using conventional carbon nanotubes which are disclosed in Appl. Phys. Lett., Vol. 72, No. 22, Jun. 1, 1998. As shown in FIG. 1, the field emission device using the conventional carbon nanotubes includes a
front substrate 1 and arear substrate 11 facing each other andanodes 2 andcathodes 12 which are formed on the front andrear substrates anodes 2 cross thecathodes 12. Thecathodes 12 are formed of carbon nanotubes in a structure in which grooves are formed on therear substrate 11 in a striped pattern and the grooves are filled with a carbon nanotube-epoxy mixture. Theanodes 2 are formed of an ITO film coated with phosphors. - FIG. 2A shows the steps of a method of fabricating the
cathodes 12 on therear substrate 11 of the field emission device of FIG. 1 using carbon nanotubes. FIG. 2B shows the steps of a method of fabricating theanodes 2 on thefront substrate 1 of the field emission device of FIG. 1 using carbon nanotubes. - In fabricating the
cathodes 12 using carbon nanotubes,grooves 12 a, as shown in (b) of FIG. 2A, are formed in a striped pattern on aglass substrate 11′, as shown in (a) of FIG. 2A. Next, a carbon nanotube-epoxy mixture 12′ is deposited, as shown in (c) of FIG. 2A. Finally, the surface of the resulting structure is planarized to complete thecathodes 12, as shown in (d) of FIG. 2A. - In fabricating the
anodes 2, anITO film 2′ is deposited on theglass substrate 1, as shown in (a) of FIG. 2B. Next, as shown in (b) of FIG. 2B, the ITOfilm 2′ is etched in a striped pattern to form theanodes 2. As shown in (c) of FIG. 2B, theanodes 2 are coated withphosphors 3. - In fabricating cathodes using carbon nanotubes in such way, however, it is very difficult to align the carbon nanotubes in a single direction and to connect the carbon nanotubes to electrodes when manufacturing a device. Accordingly, this alignment problem must be overcome to substantially apply carbon nanotubes to a display device.
- To solve the above problem, an object of the present invention is to provide a field emission array using carbon nanotubes, which can be easily aligned and closely contacts cathodes, and a method for fabricating the same.
- To achieve the above object, the present invention provides a field emission array using carbon nanotubes. The field emission array includes front and rear substrates facing each other and separated by a predetermined distance; anodes and cathodes formed on the front and rear substrates facing each other, respectively, in a striped pattern, the anodes and the cathodes crossing each other; carbon nanotubes fixed on the cathodes corresponding to intersections between the cathodes and the anodes; and a metal fuser element for fixing the carbon nanotubes on the cathodes and conducting currents between the cathodes and the carbon nanotubes.
- Preferably, the field emission array also includes an insulating layer deposited on the cathodes around the carbon nanotubes and the rear substrate, and gates formed on the insulating layer in a striped pattern to be parallel to the anodes. Each of the anodes is formed of an ITO film and coated with phosphor.
- To achieve the above object, the present invention also provides a method of fabricating a field emission array using carbon nanotubes. The method includes the steps of: (a) forming cathodes on a rear substrate in a striped pattern; (b) printing a mixture of carbon nanotubes, metal powder and organic binder on predetermined areas of the cathodes; (c) vaporizing the organic binder by sintering the mixture and anchoring the carbon nanotubes on the cathodes by diffusing the metal powder; and (d) combining a front substrate, on which anodes are formed in a striped pattern, with the rear substrate having the cathodes on which the carbon nanotubes are anchored.
- Preferably, the method also includes the steps of: forming an insulating layer on the tops of the cathodes other than portions to which the carbon nanotubes are to be adhered and on the top of the exposed rear substrate, before the step (b); and forming gates on the insulating layer after the step (c). At this time, the metal powder is composed of metal particles of a metal, selected from the group consisting of Ag, Al, Ni, Cu and Zn, having a diameter of 0.1-10 μm and is diffused at a temperature of 250-500° C.
- Preferably, in the step (b), the metal powder is melted at a low temperature of 100-350° C., and in the step (c), the mixture is sintered to evaporate the organic binder, and the low melting point metal powder is melted to anchor the carbon nanotubes on the cathodes. The metal powder is preferably composed of particles of a metal selected from the group consisting of Pb, In, InSn, PbSn, AuSn and a metal alloy thereof.
- In the step (b), the organic binder is composed of at least one selected from the group consisting of α-terpineol, ethyl cellulose and butyl carbitol acetate, and the printing is performed by an extrusion method using a filter for aligning the carbon nanotubes. Alternatively, in the step (b), the printing is performed by a screen printing method using a metal mesh screen which is patterned for aligning the carbon nanotubes. Preferably, in the step (c), the sintering is performed at a temperature of 200-500° C.
- The above object and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
- FIG. 1 is a schematic exploded perspective view of a field emission device using conventional carbon nanotubes;
- FIG. 2A shows the steps of a method of fabricating cathodes on a rear substrate of the carbon nanotube field emission device of FIG. 1;
- FIG. 2B shows the steps of a method of fabricating anodes on a front substrate of the carbon nanotube field emission device of FIG. 1;
- FIG. 3A is a plan view of a field emission array using carbon nanotubes according to the present invention;
- FIG. 3B is a sectional view of FIG. 3A taken along the line A-A′;
- FIGS. 4A through 4D are sectional views illustrating the steps of a method of fabricating a field emission array using carbon nanotubes according to the present invention;
- FIG. 5 is a sectional view of an apparatus which has a filter for alignment of carbon nanotubes and is used when a pressing method is used during the steps of FIGS. 4A through 4D;
- FIGS. 6A through 6C show pressing steps using a filter formed of ceramic (alumina) when an insulating layer is not formed in the case of FIG. 5;
- FIGS. 7A through 7E are plan and sectional views illustrating the structure of a screen printer in which a mask is combined with a mesh screen formed of stainless wires during the steps of FIGS. 4A through 4D;
- FIG. 7A is a sectional view illustrating a step of putting a screen printer on a rear substrate having cathodes and performing printing;
- FIG. 7B is a plan view of the mesh screen woven with stainless wires in the screen printer;
- FIG. 7C is an enlarged view of the mesh structure of part A of FIG. 7B;
- FIG. 7D is a sectional view of FIG. 7C taken along the line B-B′;
- FIG. 7E is a sectional view of the structure of a completed rear substrate on which carbon nanotubes are metal fused to cathodes by firing and gates are formed on an insulating layer, after finishing the printing shown in FIGS. 7A through 7D;
- FIG. 8A is a sectional view of the whole rear substrate with a dual-layer gate plate, which is previously manufactured;
- FIG. 8B is a perspective view of the whole gate plate of FIG. 8A;
- FIG. 9 is a photograph (4×80 mm) showing the electron emission characteristic of carbon nanotubes which are fabricated by screen printing;
- FIG. 10 is a current-electric field graph showing the electron emission characteristic of a field emission array using carbon nanotubes according to the present invention;
- FIG. 11 is a luminance-electric field graph showing the electron emission luminance characteristic of a field emission array using carbon nanotubes according to the present invention; and
- FIG. 12 is a photograph showing the electron emission of a field emission array using carbon nanotubes according to the present invention.
- A field emission array using carbon nanotubes according to the present invention is characterized in that carbon nanotubes and metal power are adhered to cathodes with an organic matter, and then the carbon nanotubes are fused to the cathodes by evaporating the organic matter and melting the metal powder. The present invention can be adopted in any multi-electrode tube structure of a field emission array as well as a diode structure having an anode and a cathode and a triode structure having an anode, a cathode and a gate. According to the present invention, carbon nanotubes are fused to cathodes and substitute for microtips for emitting electrons. As an embodiment of the present invention, a triode field emission array will be described in detail with reference to FIGS. 3A and 3B.
- As shown in FIG. 3B, a field emission array using carbon nanotubes according to the present invention includes a
front substrate 101 and arear substrate 111 facing each other andanodes 102 andcathodes 112 which are formed on the front andrear substrates anodes 102 cross thecathodes 112.Carbon nanotubes 112 a are fused to thecathodes 112 using ametal fuser element 112 b. An insulatinglayer 113 is provided on therear surface 111 and the part of thecathodes 112 other than the part of thecathodes 112 to which thecarbon nanotubes 112 a are fused.Gates 114 are formed on the insulatinglayer 113 in a striped pattern. Each of theanodes 102 is formed of an ITO film, and the entire surface of eachanode 102 is coated withphosphor 103. - In fabricating a carbon nanotube field emission array having such structure, first, the
cathodes 112 are formed on therear substrate 111 in a striped pattern, as shown in FIG. 4A (referred to as step X). Next, as shown in FIG. 4B, the insulatinglayer 113 is formed on the exposedrear substrate 111 and the part of thecathodes 112 other than the part to which carbon nanotubes are fixed. Next, as shown in FIG. 4C, amixture cathodes 112 through insulatinglayer opening portions 112 c over the cathodes 112 (referred to as step Y). In the case of the diode, the insulatinglayer 113 may be formed, but does not need to be formed. Subsequently, as shown in FIG. 4D, themixture carbon nanotubes 112 a to the cathodes 112 (referred to as step Z). Thereafter, thefront substrate 101, on which theanodes 102 are formed in a striped pattern, is combined with therear substrate 111 having thecathodes 112, to which thecarbon nanotubes 112 a are fused, spaced apart by a predetermined distance, thereby completing the array. - In a method of fabricating such field emission device, the step Y of self-aligning carbon nanotubes is particularly difficult. To over this difficulty, the present invention proposes two methods of aligning carbon nanotubes. In a first method, as shown in FIG. 5 or FIGS. 6A through 6C, after diffusing carbon nanotubes, a
mixture 120 of an organic binder and powder of a low-melting point metal such as aluminum, silver, zinc or copper is squeezed intoholes 130 a in a filter formed of glass such that themixture 120 is injected into theholes 112 c in the insulatinglayer 113, which are aligned with a predetermined pixel size. Thereafter, the organic binder is heated to be evaporated, and the metal powder is melted to fix the carbon nanotubes. In a second method, as shown in FIGS. 7A through 7E, after diffusing carbon nanotubes, a mixture of low-melting point metal powder and an organic binder is pressed on electrodes by a screen printing method using ametal mesh screen 160 a which is patterned on a substrate of an insulating material, so that the carbon nanotubes can be aligned and fixed. - It is advantageous in printing to use metal powder in which the diameters of the particles are about 0.1-10 μm when making a mixture for adhering carbon nanotubes. When fabricating a multi-electrode tube other than a diode, an insulating layer is essential. To prevent damage on an insulating layer during sintering after printing of the mixture, metal must easily melt at low temperature. Accordingly, a low-melting point metal powder, which is melted at a lower temperature than a temperature at which the insulating layer is formed, should be used. Since the insulating layer is generally formed at about 450-570° C., it is preferable to use a metal which is diffused at 250-500° C. or melted at 100-350° C. for metal powder. Silver (Ag), aluminum (Al), nickel (Ni), copper (Cu) and zinc (Zn) can be used as the metal which is diffused at 250-500° C. Pb, In, InSn, PbSn and AuSn can be used as the metal which is melted at 100-350° C.
- For an organic binder used in making a mixture for printing, α-terpineol, ethyl cellulose or butyl carbitol acetate may be used. In mixing, the mixture is completely mixed by grinding source materials.
- When using an extrusion technique in the printing step Y in which the alignment of carbon nanotubes is determined, an apparatus with a
filter 130 for alignment of carbon nanotubes, as shown in FIG. 5, is used. When amixture 120 for printing is injected into acylinder 140 with thefilter 130 and firmly pressed with apiston 150, themixture 120 passes through theholes 130 a on thefilter 130 and is applied to thecathodes 112 exposed by the openingportions 112 c on the insulatinglayer 113 while vertically aligning carbon nanotubes contained in themixture 120. In other words, a mixed paste is extruded through a ceramic (or glass) filter with holes of a pixel size, and thus aligned on cathodes. Thereafter, an organic binder is evaporated by heat treatment at low temperature (200-500° C.), and metal powder is sintered to fix carbon nanotubes in the holes of an insulating layer. - Unlike FIG. 5, FIGS. 6A through 6C show a process of pressing carbon nanotubes through a filter formed of ceramic (alumina) when an insulating layer is not formed. Carbon nanotubes, which are extruded through holes on the filter and aligned, are pressed on patterned metal films (cathodes) to be fixed. FIG. 6A shows a state in which a mixture for printing is injected into the
holes 130 a of the ceramic (alumina)filter 130. FIG. 6B shows a state in which theholes 130 a of thefilter 130 are aligned on thecathode 112 lines on therear substrate 111 without an insulating layer. FIG. 6C shows a state in whichcarbon nanotubes 112 a are adhered by printing the mixture on predetermined areas of thecathodes 112 through pressing and sintering. - When using a screen printing technique in the printing step Y in which the alignment of carbon nanotubes is determined, as shown in FIGS. 7A through 7E, a
screen printer 160, in which amesh screen 160 a formed of stainless steel wires is combined with amask 160 b, is used. More specifically, as shown in FIG. 7A, after laying thescreen printer 160 on therear substrate 111 having thecathodes 112, a roller (not shown) to which a mixture for printing is applied is rolled on thescreen printer 160. Then, the mixture on the roller sequentially passes through themask 160 b and thescreen 160 a of thescreen printer 160 and is applied to the top of each of thecathodes 112 through the holes of the insulatinglayer 113 on therear substrate 111. Since the mixture passes through themesh screen 160 a in printing, carbon nanotubes contained in the mixture are vertically aligned on thecathodes 112. FIG. 7B is a plan view of themesh screen 160 a woven with stainless steel wires in thescreen printer 160. FIG. 7C is an enlarged view of the mesh structure of part A of FIG. 7B. FIG. 7D is a sectional view of FIG. 7C taken along the line B-B′. Referring to FIG. 7D, thescreen printer 160 includes the screen which is made by weaving a mesh comprisingwarp threads 161 andweft threads 162 and themask 160 b for making the mixture injected only into predetermined areas. FIG. 7E shows the structure of the completedrear substrate 111, on which thecarbon nanotubes 112 a are fused to thecathodes 112 by melted metal powder andgates 114 are formed on the insulatinglayer 113, after finishing the printing of the mixture by the screen printing scheme. Thegates 114 are formed by depositing a metal on the SiO2 insulating layer 113 and patterning the deposited metal using a photolithography method. Alternatively, after screen printing and firing has been completed, agate plate 170 which is prepared in advance, as shown in FIG. 8A, may be bonded onto the insulatinglayer 113 to complete a device. FIG. 8B is a perspective view illustrating the whole appearance of thegate plate 170. Thegate plate 170 is formed by depositing agate 170 b formed of a conductor on asubstrate 170 a formed of an insulating material. - It is preferable to perform the sintering at a temperature of 200-500° C. in the heat treatment process of the step Z.
- The functions of carbon nanotubes in such field emission array are shown through FIGS. 9 through 12. FIG. 9 is a photograph (40×80 mm) showing the electron emission characteristic of carbon nanotubes which are fabricated by screen printing. FIG. 10 is a current-electric field graph showing the electron emission characteristic of the carbon nanotubes. FIG. 11 is a luminance-electric field graph showing the electron emission luminance characteristic of the carbon nanotubes. FIG. 12 is a photograph showing the electron emission of the carbon nanotubes.
- After finishing the fabrication of the rear substrate, the front substrate is coated with phosphor in such a manner that each anode of a pixel size is coated with red, green or blue phosphor. Thereafter, the front and rear substrates are packaged in vacuum to constitute a display.
- A cathode structure to which carbon nanotubes are fused according to the present invention can be used as a cathode for super high frequency microwave.
- As described above, a field emission array according to the present invention uses carbon nanotubes as electron emission sources, thereby lowering a work function and dropping driving voltage. Consequently, the present invention allows a device to be driven at low voltage. In addition, the present invention improves resistance to gases, which are generated during the operation of a device, thereby increasing the lifetime of an emitter, and substantially discharging heat, which is generated during the operation, thereby making epoch-making improvement in the performance of the filed emitter. Moreover, the present invention allows emission of high density electrons by using an extremely microscopic electron emission source. Consequently, the present invention can be widely adopted, for example, in high frequency electron oscillators and displays driven at low voltage, as a next generation high density electron emission source.
- Furthermore, the present invention uses room temperature deposition and low temperature heat treatment for fabricating an electron emission source emitter of carbon nanotubes, and uses screen printer as a fabricating apparatus, thereby simplifying the fabrication process.
Claims (14)
1. A field emission array using carbon nanotubes, comprising:
front and rear substrates facing each other and separated by a predetermined distance;
anodes and cathodes formed on the front and rear substrates facing each other, respectively, in a striped pattern, the anodes and the cathodes crossing each other;
carbon nanotubes fixed on the cathodes corresponding to intersections between the cathodes and the anodes; and
a metal fuser element for fixing the carbon nanotubes on the cathodes and conducting currents between the cathodes and the carbon nanotubes.
2. The field emission array of claim 1 , further comprising:
an insulating layer deposited on the cathodes around the carbon nanotubes and the rear substrate; and
gates formed on the insulating layer in a striped pattern to be parallel to the anodes.
3. The field emission array of claim 1 or 2, wherein each of the anodes is formed of an ITO film and coated with phosphor.
4. A method of fabricating a field emission array using carbon nanotubes, the method comprising the steps of:
(a) forming cathodes on a rear substrate in a striped pattern;
(b) printing a mixture of carbon nanotubes, metal powder and organic binder on predetermined areas of the cathodes;
(c) vaporizing the organic binder by sintering the mixture and anchoring the carbon nanotubes on the cathodes by diffusing the metal powder; and
(d) combining a front substrate, on which anodes are formed in a striped pattern, with the rear substrate having the cathodes on which the carbon nanotubes are anchored.
5. The method of claim 4 , further comprising the steps of:
forming an insulating layer on the tops of the cathodes other than portions to which the carbon nanotubes are to be adhered and on the top of the exposed rear substrate, before the step (b); and
forming gates on the insulating layer after the step (c).
6. The method of claim 4 or 5, wherein in the step (b), the metal powder is composed of metal particles having a diameter of 0.1-10 μm.
7. The method of claim 4 or 5, wherein in the step (b), the metal powder is diffused at a temperature of 250-500° C.
8. The method of claim 7 , wherein the metal powder is composed of particles of a metal selected from the group consisting of Ag, Al, Ni, Cu and Zn.
9. The method of claim 4 or 5, wherein in the step (b), the metal powder is melted at a low temperature of 100-350° C., and in the step (c), the mixture is sintered to evaporate the organic binder, and the low melting point metal powder is melted to anchor the carbon nanotubes on the cathodes.
10. The method of claim 9 , wherein the metal powder is composed of particles of a metal selected from the group consisting of Pb, In, InSn, PbSn, AuSn and a metal alloy thereof, and the diameter of each of the particles is 0.1-10 μm.
11. The method of claim 4 or 5, wherein in the step (b), the organic binder is composed of at least one selected from the group consisting of α-terpineol, ethyl cellulose and butyl carbitol acetate.
12. The method of claim 4 or 5, wherein in the step (b), the printing is performed by an extrusion method using a filter for aligning the carbon nanotubes.
13. The method of claim 4 or 5, wherein in the step (b), the printing is performed by a screen printing method using a metal mesh screen which is patterned for aligning the carbon nanotubes.
14. The method of claim 4 or 5, wherein in the step (c), the sintering is performed at a temperature of 200-500° C.
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