Double layer mixing structure carbon nano tube membrane field emission cathode and preparation thereof

A field emission cathode and carbon nanotube technology, which is applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problem of reducing contact resistance, increasing the enhancement factor of unfavorable CNT emitters, and increasing CNT and substrate Contact resistance and other issues to achieve the effect of increasing the enhancement factor, improving the field emission performance, and reducing the shielding effect

Inactive Publication Date: 2011-04-06
XI AN JIAOTONG UNIV
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Problems solved by technology

However, while conductive blended particles reduce the contact resistance between CNT and substrate, they are not conducive to the improvement of the enhancement factor of CNT emitters due to the shielding effect; on the contrary, the blended materials with dielectric properties are beneficial to the enhancement factor of CNT emitters However, it increases the contact resistance between CNT and substrate

Method used

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  • Double layer mixing structure carbon nano tube membrane field emission cathode and preparation thereof
  • Double layer mixing structure carbon nano tube membrane field emission cathode and preparation thereof
  • Double layer mixing structure carbon nano tube membrane field emission cathode and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The specific process includes the following two steps:

[0027] The first step is to prepare a CNT composite cathode film with a single-layer Ti-blended structure. 1. Put the multi-walled CNT into a mixed solution of nitric acid and sulfuric acid (volume ratio: 4:1) for acidification, remove amorphous carbon and catalyst, wash with deionized water, filter with filter paper and dry in a drying oven. 2. Timely disperse CNTs into terpineol with an ultrasonic wave length, filter through a screen to remove larger aggregates; add ethyl cellulose, heat to 100°C with a magnetic stirrer and stir for a long time until the ethyl cellulose All the elements are dissolved to form a uniform dispersion, that is, CNT slurry; the nano-Ti powder slurry is prepared by the same method. 3. Mix the CNT reduction material and the Ti nano powder slurry (mass ratio: 1:1), heat to 100° C. with a magnetic stirrer again and stir for a long time to form a Ti-blended CNT composite slurry. 4. Print ...

Embodiment 2

[0030] To prepare the field emission cathode of carbon nanotube thin film with double-layer blending structure, firstly, nano-powder titanium (Ti) was dispersed in terpineol with ultra-wavelength time, then ethyl cellulose was added, and heated to 100°C with a magnetic stirrer. Stir for a long time until the ethyl cellulose is completely dissolved to form a Ti dispersion slurry; then mix the Ti slurry with the ordinary CNT slurry to form a Ti-blended CNT composite slurry;

[0031] Secondly, the Ti-blended CNT composite paste was printed on a conductive substrate by screen technology to prepare a single-layer blended structure CNT film;

[0032] Finally, a two-step sintering process was adopted: first, sintering at 500°C for 3 hours in hydrogen or ammonia protective gas to promote the decomposition and evaporation of the organic binder and solidify the CNT composite film, and then sintering at 300°C in the atmosphere for 1.5 hours to form a double Layer blend structure carbon n...

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Abstract

The invention discloses a membrane field emitting cathode of a carbon nanotube with double-layer blending structure and a preparation method thereof. Ti nano-powder is adopted to be mixed for preparing composite sizing agent (CNT), and CNT cathode membrane with single-layer Ti blending structure is printed by screen printing technique. The CNT composite membrane cathode with the double-layer blending structure that is TiO2 blending structure at the upper layer and Ti blending structure at the lower layer is formed by two-step sintering technique. On the surface layer of the composite membranecathode, conductive Ti is transformed into non-conductive dielectric material TiO2; shielding effect caused by the mutual contact of CNT is reduced, thereby being beneficial to the increase of enhancement factor of a CNT emitter. At the bottom of the composite membrane cathode, the blending nanophase material Ti enlarges the contact area between the CNTs and between the CNT and an underlay, reduces the contact resistance between the conductive electrode layers and the CNT layers and improves the electronic transportation performance of the self of CNT at the lower layer of the composite membrane cathode.

Description

technical field [0001] The invention relates to a field emission cathode structure and a preparation method thereof, in particular to a thin film field emission cathode with a CNT double-layer blending structure and a preparation method thereof. Background technique [0002] Since Lijima discovered CNTs, CNTs have been widely used in the field of field emission. Compared with traditional silicon tip, tungsten tip and molybdenum tip arrays, CNT has a sharper field emission tip, higher mechanical strength and more stable chemical properties, and has a wide range of materials and a relatively simple preparation process. Currently, there are two methods for preparing CNT field emission cathodes, chemical vapor deposition (CVD) and transplantation. Due to the high cost of preparing CNT cathodes by CVD technology, especially the higher cost of cathodes used to prepare large-scale display devices, it is not conducive to the industrialization of CNT field emission flat panel displa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02
Inventor 朱长纯商世广
Owner XI AN JIAOTONG UNIV
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