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3d graphene/one-dimensional nanomaterial composite structure field emission cathode and preparation method

A field emission cathode and nano-material technology, which is applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of not fully utilizing the properties of graphene, achieve good application prospects, increase quantity, Effect of High Electron Mobility

Active Publication Date: 2018-09-25
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

[0005] Existing research works have studied the field emission properties of composite structures of graphene and one-dimensional nanomaterials, but the composite structures of these research works are mainly planar composite structures, and mainly use graphene as the substrate, taking advantage of graphene's ultra-high electronic properties. Mobility, as an electron transport layer, not as an emission layer, cannot fully utilize the excellent properties of graphene

Method used

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  • 3d graphene/one-dimensional nanomaterial composite structure field emission cathode and preparation method
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  • 3d graphene/one-dimensional nanomaterial composite structure field emission cathode and preparation method

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preparation example Construction

[0031] A preparation method of the above-mentioned 3D graphene / one-dimensional nanomaterial composite structure field emission cathode, comprising the following steps:

[0032] Step 1. Wash the metal foam with a traditional substrate cleaning process, and dry it with nitrogen for later use;

[0033] Step 2, growing graphene on the metal foam after step 1 treatment;

[0034] Step 3, using a deposition method to deposit a one-dimensional nanomaterial seed layer on the substrate with graphene grown after the treatment in step 2;

[0035] Step 4, growing one-dimensional nanomaterials on the substrate treated in Step 3.

[0036] The one-dimensional nanomaterial seed layer is a material seed layer that the one-dimensional nanomaterial has good field emission performance, and ZnO, ZnS, ZnSe, SiC, CuO, MoO can be selected. 2 or AlN with a total thickness of 10-20nm.

[0037] The metal foam cleaning process in step 1 is as follows: first soak in dilute hydrochloric acid for 5-10 min...

Embodiment

[0039] Cut metal Ni foam 12×10cm (length×width) and clean it, first soak it with dilute hydrochloric acid for 5-10 minutes, then alternately ultrasonicate it with ethanol, acetone, and isopropanol for 10-60 minutes, and blow dry it with nitrogen for later use; put the cleaned metal Ni The foam is placed in a CVD tube furnace to grow 3D graphene; the temperature of the furnace is raised to 930°C, and Ar:H 2 =250: 100sccm annealed for 5 minutes, then 5sccm CH 4 5min; Deposit a zinc oxide seed layer on the grown graphene by atomic layer deposition (ALD), with a deposition thickness of 10-20nm; put the 3D graphene substrate deposited with the zinc oxide seed layer into a zinc oxide growth Zinc oxide nanorod arrays were grown by hydrothermal method in a liquid reaction kettle, the temperature was 90°C, and the time was 3-6h; the growth solution of zinc oxide nanorods was Zn(NO3)2•6H2O (50mM) and hexamethylenetetraammonium ( HMTA, 50mM) mixed solution; finally 80 ℃ vacuum drying fo...

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Abstract

The invention relates to the technical field of nanometer function device field emission, and provides a 3D graphene / one-dimensional nanomaterial composite structure field emission cathode which comprises a metal foam skeleton substrate, a graphene layer and a one-dimensional nanomaterial layer. The graphene layer is located between the metal foam skeleton substrate and the one-dimensional nanomaterial layer. The graphene layer is used as an electronic transmission layer and used as an emission layer in cooperation with the one-dimensional nanomaterial layer. The invention further provides a preparation method of the 3D graphene / one-dimensional nanomaterial composite structure field emission cathode. The 3D graphene / one-dimensional nanomaterial composite structure field emission cathode has the advantage that metal foam is used as a skeleton to achieve preparation of the graphene / one-dimensional nanomaterial composite structure, and large number of field emission points are provided; graphene is used as both the electronic transmission layer and the emission layer, and excellent properties of graphene are sufficiently utilized; the preparation process is simple, and rapid, uniform and large-area 3D space type field emission cathode preparation can be achieved, and the field emission cathode has low opening electric field, high emission current density and emission current stability, and has the good application prospect.

Description

technical field [0001] The invention relates to the field emission technology field of nano functional devices, in particular to a 3D graphene / one-dimensional nanomaterial composite structure field emission cathode and a preparation method. Background technique [0002] Graphene is a new type of two-dimensional nanomaterial with excellent electrical, chemical and mechanical properties. It has been widely used in many fields, including: electrochemical field, sensor field, biological field, energy field and field emission field, etc. . Graphene's atomic layer thickness, large number of edge structures, and excellent electrical properties determine that it is an ideal field emission material. [0003] Due to the edge emission characteristics of graphene, in order to realize the application of graphene in field emission, it is first necessary to prepare a large amount of graphene that is vertical to the substrate. At present, the methods for preparing graphene cathode mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02
CPCH01J1/304H01J9/025
Inventor 张跃罗宝和廖庆亮赵璇丁一冯世安
Owner UNIV OF SCI & TECH BEIJING
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