Method for preparing metallized carbon nanotube cathode by electrophoretic deposition in assistance of magnetic field

Abstract

The invention discloses a method for preparing a metallized carbon nanotube cathode by electrophoretic deposition in assistance of a magnetic field. The method comprises the following steps of: preparing a carbon nanotube electrophoretic solution which is uniform and stable to disperse, from an carbon nanotube the surface of which is plated with magnetic metal; and under of the action of the magnetic field, preparing the metallized carbon nanotube cathode by adopting an electrophoretic deposition method. A carbon nanotube with the prepared metallized carbon nanotube cathode has good orientation, can greatly improve the conductivity and emissivity of electrons and further improves the adhesiveness of the metallized carbon nanotube cathode and a substrate electrode.

Description

technical field

[0001] The invention relates to a preparation technology of a carbon nanotube field emission cathode, and more particularly relates to a preparation method of a magnetic field-assisted electrophoretic deposition metallized carbon nanotube cathode. Background technique

[0002] Carbon Nanotubes (CNTs) have excellent electrical, magnetic and mechanical properties. In particular, carbon nanotubes have a nanoscale tip curvature radius and a low work function, showing good field emission characteristics. However, due to the nano-effect of the carbon nanotubes themselves, they are very easy to agglomerate, which affects the effectiveness of the electron emission of the carbon nanotubes, and due to the lack of sufficient interfacial bonding between the carbon nanotubes and the matrix, the electron conduction and emission of the carbon nanotubes cannot be fully utilized. ability, which affects the application of carbon nanotubes in the field of field emission. [0...

Examples

Embodiment 1

[0018] This embodiment provides a method for preparing a nickel-coated carbon nanotube cathode on a surface assisted by electrophoretic deposition. The following will be described in combination with specific implementation steps. figure 1 Schematic diagram of deposition of metallized carbon nanotube cathodes for magnetic field-assisted electrophoresis

[0019] 1） Pretreatment of carbon nanotubes before electrophoresis

[0020] (1) Purify, sensitize, and activate carbon nanotubes;

[0021] (2) A uniform magnetic metal nickel layer is deposited on the surface of carbon nanotubes by electroless plating;

[0022] 2） Preparation of carbon nanotube electrophoretic fluid

[0023] Preparation of organic slurry: first take ethyl cellulose ([C 6 h 7 o 2 (OC 2 h 5 ) 3 ] n ) 10 g, terpineol (C 10 h 18 O) 500 mL and 2 g of polyvinylpyrrolidone were mixed together at a temperature of 80 °C, and stirred by magnetic heating for 4 h, so that various materials were evenly mixed. ...

Embodiment 2

[0028] This embodiment provides a method for preparing a carbon nanotube cathode coated with an iron-cobalt composite magnetic metal layer on the surface by magnetic field-assisted pulse electrophoretic deposition. The following will be described in combination with specific implementation steps.

[0029] 1） Pretreatment of carbon nanotubes

[0030] (1) Purify, sensitize, and activate carbon nanotubes;

[0031] (2) A uniform iron-cobalt composite magnetic metal layer is deposited on the surface of carbon nanotubes by evaporation coating method.

[0032] 2) Preparation of carbon nanotube electrophoretic fluid

[0033] Get the carbon nanotube of 50 mg surface plating iron-cobalt composite magnetic metal layer and 25mg magnesium nitrate hexahydrate (Mg(NO 3 )·6H 2 O) Disperse in 250ml of isopropanol, and ultrasonically disperse in an ultrasonic cell pulverizer for 1 hour to obtain a uniform surface metallized carbon nanotube dispersion (0.2mg / ml).

[0034] 3） Preparation o...

technical field

[0001] The invention relates to a preparation technology of a carbon nanotube field emission cathode, and more particularly relates to a preparation method of a magnetic field-assisted electrophoretic deposition metallized carbon nanotube cathode. Background technique

[0002] Carbon Nanotubes (CNTs) have excellent electrical, magnetic and mechanical properties. In particular, carbon nanotubes have a nanoscale tip curvature radius and a low work function, showing good field emission characteristics. However, due to the nano-effect of the carbon nanotubes themselves, they are very easy to agglomerate, which affects the effectiveness of the electron emission of the carbon nanotubes, and due to the lack of sufficient interfacial bonding between the carbon nanotubes and the matrix, the electron conduction and emission of the carbon nanotubes cannot be fully utilized. ability, which affects the application of carbon nanotubes in the field of field emission. [0...

Examples

Embodiment 1

[0018] This embodiment provides a method for preparing a nickel-coated carbon nanotube cathode on a surface assisted by electrophoretic deposition. The following will be described in combination with specific implementation steps. figure 1 Schematic diagram of deposition of metallized carbon nanotube cathodes for magnetic field-assisted electrophoresis

[0019] 1） Pretreatment of carbon nanotubes before electrophoresis

[0020] (1) Purify, sensitize, and activate carbon nanotubes;

[0021] (2) A uniform magnetic metal nickel layer is deposited on the surface of carbon nanotubes by electroless plating;

[0022] 2） Preparation of carbon nanotube electrophoretic fluid

[0023] Preparation of organic slurry: first take ethyl cellulose ([C 6 h 7 o 2 (OC 2 h 5 ) 3 ] n ) 10 g, terpineol (C 10 h 18 O) 500 mL and 2 g of polyvinylpyrrolidone were mixed together at a temperature of 80 °C, and stirred by magnetic heating for 4 h, so that various materials were evenly mixed. ...

Embodiment 2

[0028] This embodiment provides a method for preparing a carbon nanotube cathode coated with an iron-cobalt composite magnetic metal layer on the surface by magnetic field-assisted pulse electrophoretic deposition. The following will be described in combination with specific implementation steps.

[0029] 1） Pretreatment of carbon nanotubes

[0030] (1) Purify, sensitize, and activate carbon nanotubes;

[0031] (2) A uniform iron-cobalt composite magnetic metal layer is deposited on the surface of carbon nanotubes by evaporation coating method.

[0032] 2) Preparation of carbon nanotube electrophoretic fluid

[0033] Get the carbon nanotube of 50 mg surface plating iron-cobalt composite magnetic metal layer and 25mg magnesium nitrate hexahydrate (Mg(NO 3 )·6H 2 O) Disperse in 250ml of isopropanol, and ultrasonically disperse in an ultrasonic cell pulverizer for 1 hour to obtain a uniform surface metallized carbon nanotube dispersion (0.2mg / ml).

[0034] 3） Preparation o...

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