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SiC flexible field emission cathode material

A field emission cathode and field emission technology, applied in cold cathode manufacturing, electrode system manufacturing, electrical components, etc., can solve the problems of the research and development of flexible field emission cathode materials that are rarely reported in literature, and achieve excellent field emission performance and high flexibility. Effect

Active Publication Date: 2013-09-18
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing research work mainly focuses on SiC field emission cathode materials based on hard substrates (such as Si sheets and metal sheets, etc.), and the development of flexible field emission cathode materials is rarely reported in the literature.

Method used

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  • SiC flexible field emission cathode material

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Effect test

Embodiment 1

[0032] The initial raw material is polysilazane, in N 2 Under the protection of the atmosphere, heat preservation at 260°C for 30 minutes for thermal crosslinking and curing. The solidified SiCN solid was put into a nylon resin ball mill jar, ball milled and pulverized into powder, and 300 mg was weighed and placed at the bottom of a graphite crucible. Cut carbon cloth 5×5cm (length×width), at 0.05mol / LCo(NO 3 ) 3 Immerse in ethanol solution and sonicate for 10 seconds, take it out and let it dry naturally in air environment. The impregnated carbon is arranged on the top of the graphite crucible and placed in an atmosphere sintering furnace heated by graphite resistance. The atmosphere furnace is first evacuated to 10 -4 Pa, refill N 2 :Ar=5:95 nitrogen-argon gas mixture (volume ratio, purity 99.99%), until the pressure is one atmosphere (~0.11Mpa), and then the pressure is constant. Then the temperature was raised rapidly from room temperature to 1400°C at a rate of 40°...

Embodiment 2

[0034] The initial raw material is polysilazane, in N 2 Under the protection of the atmosphere, heat preservation at 260°C for 30 minutes for thermal crosslinking and curing. The solidified SiCN solid was put into a nylon resin ball mill jar, ball milled and pulverized into powder, and 300 mg was weighed and placed at the bottom of a graphite crucible. Cut carbon cloth 5×5cm (length×width), at 0.05mol / LCo(NO 3 ) 3 Immerse in ethanol solution and sonicate for 10 seconds, take it out and let it dry naturally in air environment. The impregnated carbon is arranged on the top of the graphite crucible and placed in an atmosphere sintering furnace heated by graphite resistance. The atmosphere furnace is first evacuated to 10 -4 Pa, refill N 2:Ar=5:95 nitrogen-argon gas mixture (volume ratio, purity 99.99%), until the pressure is one atmosphere (~0.11Mpa), and then the pressure is constant. Then rapidly raise the temperature from room temperature to 1450°C at a rate of 40°C / min,...

Embodiment 3

[0036] The initial raw material is polysilazane, in N 2 Under the protection of the atmosphere, heat preservation at 260°C for 30 minutes for thermal crosslinking and curing. The solidified SiCN solid was put into a nylon resin ball mill jar, ball milled and pulverized into powder, and 300 mg was weighed and placed at the bottom of a graphite crucible. Cut carbon cloth 5×5cm (length×width), at 0.05mol / LCo(NO 3 ) 3 Immerse in ethanol solution and sonicate for 10 seconds, take it out and let it dry naturally in air environment. The impregnated carbon is arranged on the top of the graphite crucible and placed in an atmosphere sintering furnace heated by graphite resistance. The atmosphere furnace is first evacuated to 10 -4 Pa, refill N 2 : Ar=10:90 nitrogen-argon gas mixture (volume ratio, purity 99.99%), until the pressure is one atmospheric pressure (~0.11Mpa), and then the pressure is constant. Then rapidly raise the temperature from room temperature to 1400°C at a rate...

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Abstract

A method of preparing SiC flexible field emission cathode material includes the steps: 1, holding organic precursor polysilazane at 260 DEG C for 30 min for thermal crosslinking and solidification, and crushing by ball milling; 2, making a flexible substrate out of carbon cloth, soaking the substrate in 0.05mol / LCo(NO3)2 ethanol solution for ultrasonic treatment for 10s, and naturally air-drying the substrate for use; 3, placing the crushed powder and the soaked carbon cloth substrate at the top and bottom of a graphite crucible; 4, placing the graphite crucible in an atmosphere sintering furnace, and heating to 1500-1550 DEG C under the protection of nitrogen-argon mixed atmosphere for high temperature pyrolysis; 5, allowing for furnace cooling till room temperature so that a flexible SiC quasi-oriented nano array with the carbon cloth substrate is prepared; and 6, using the SiC quasi-oriented nano array structure as the field emission cathode for field emission performance detection and analysis. The prepared SiC field emission cathode material is well flexible and excellent in field emission performance, and is expected to be applied to the fields of flexible displays, small-sized X-ray tubes and the like.

Description

technical field [0001] The invention relates to a method for preparing a SiC flexible field emission cathode material, which belongs to the technical field of material preparation. Background technique [0002] Flexible electronics hold great promise in areas such as electronic fabrics, distributed sensors, displays on paper, and large curved displays on building surfaces. Therefore, using nano-semiconductor components to construct functionally flexible systems with both mechanical flexibility and superior performance is one of the active research hotspots at home and abroad. Since the discovery of carbon nanotubes, the preparation science of low-dimensional nanomaterials and their device applications have always been the research focus and hotspot in nanotechnology, and have become the focus of research on the correlation between the electrical, thermal and mechanical properties of materials and the dimensionality and quantum confinement effects. An effective research syst...

Claims

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Application Information

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IPC IPC(8): H01J9/02
Inventor 杨为佑陈善亮王霖
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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