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Carbon nanotube as field emission material

A carbon nanotube and field emission technology, applied in discharge tubes, parts of discharge tubes/lamps, electrical components, etc., can solve the problems of high manufacturing cost and poor chemical stability of electrode materials, and achieve long emission life and low criticality. Emission threshold, good chemical stability

Inactive Publication Date: 2004-10-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] Traditional field electron emission materials are usually molybdenum, tungsten, silicon, etc., and their critical emission threshold is as low as 30-50V / μm, and the chemical stability of electrode materials is poor, so the working environment must reach ~10 -8 Pa ultra-high vacuum, high manufacturing cost

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  • Carbon nanotube as field emission material
  • Carbon nanotube as field emission material
  • Carbon nanotube as field emission material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] device attached figure 1, attached image 3.

[0021] Fill the reaction chamber with hydrogen gas of 300 Torr and argon gas of 200 Torr, and adjust the angle between the cathode rod and the upper surface of the anode disc to be 50°, d 阳极 : d 阴极 8. About 200mg single-walled carbon nanotube rope product was obtained after 5 minutes of arc discharge (direct current, 100A) between the two electrodes. Take a single-wall carbon nanotube rope with a length of 3-4cm and a diameter of ~70μm, and cut a section of 3-4mm; fix it on the sample stage with conductive glue, so that the axis of the carbon pipe rope is perpendicular to the surface of the sample stage; adjust The distance between the tip of the carbon tube rope and the transparent anode is 2-3cm, and the positioning system is used to accurately measure the distance; vacuumize to 5×10 -6 Pa, gradually apply the voltage to measure the emission current on the transparent anode; take out the carbon pipe rope sample and ...

Embodiment 2

[0023] Take a 3-4cm long, diameter ~ 70μm embodiment 1 to prepare a single-wall nano-carbon tube rope, cut a section of 3-4mm; fix it on the sample stage with conductive glue, so that the carbon tube rope is axially aligned with the sample stage The surface is vertical; adjust the distance between the tip of the carbon tube rope and the transparent anode to 2-3cm, and use the positioning system to accurately measure the distance; vacuumize to 5×10 -7 Pa, gradually apply the voltage to measure the emission current on the transparent anode; take out the carbon pipe rope sample and measure its diameter under the scanning electron microscope; draw the I-V curve. The initial emission threshold of carbon pipe rope is calculated to be 0.15V / μm, and the critical emission threshold is 0.24V / μm.

Embodiment 3

[0025] device attached figure 2, attached image 3.

[0026] The hydrocarbon benzene, the growth promoter hydrogen sulfide and the catalyst precursor ferrocene enter the horizontal tube furnace under the carry of hydrogen and argon. The atomic ratio of H, C and S in the mixed gas is 4:1:0.01. Hydrocarbons are decomposed by catalysis at about 1200°C, and about 40 mg of single-walled carbon nanotube ropes are obtained after 20 minutes of reaction. Obtain a single-wall carbon nanotube rope with a length of 3-4cm and a diameter of ~50μm, and cut a section of 3-4mm; fix it on the sample stage with conductive glue, so that the axis of the carbon pipe rope is perpendicular to the surface of the sample stage; Adjust the distance between the tip of the carbon tube rope and the transparent anode to 2-3cm, and use the positioning system to accurately measure the distance; vacuumize to 5×10 -6 Pa, gradually apply the voltage to measure the emission current on the transparent anode; ta...

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Abstract

A field emission material is a string of single-wall carbon nanotubes bundle with better orientation nature. The said carbon nanotube string has 1-1000 mm for length, 1-1000 microns for diameter, less than 30 deg for walk-off angle, the respiratory mode peak at 200 / cm and shoulder peak at 1570 / cm. Its advantages are low critical emission threshold, low electric consumption, high emission power and chemical stability, and long service life.

Description

Technical field: [0001] The invention relates to a field electron emission material, and in particular provides a novel single-wall nanometer carbon tube field electron emission material. Background technique: [0002] Traditional field electron emission materials are usually molybdenum, tungsten, silicon, etc., and their critical emission threshold is as low as 30-50V / μm, and the chemical stability of electrode materials is poor, so the working environment must reach ~10 -8 Pa ultra-high vacuum, high manufacturing cost. With the continuous development of high-tech fields such as electronic communications, the demand for field electron emission materials with excellent performance is increasingly urgent. [0003] Carbon nanotubes are a new member of the carbon family discovered in the early 1990s. They can be regarded as seamless hollow tubes formed by convolutions of graphene sheet structures. It is considered to be an ideal emitter material because of its large ratio. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02H01J1/304H01J13/04
Inventor 成会明刘畅佟钰丛洪涛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI