Preparation method and application of nitrogen-doped graphene@SiO2 coaxial nanotube

A technology of nitrogen-doped graphene and nanotubes, which is applied in the direction of nanotechnology, nanotechnology, discharge tube/lamp parts, etc., can solve problems such as the research on the emission properties of one-dimensional tubular graphene, and avoid preparation and Elimination of process, uniform appearance, and high product purity

Inactive Publication Date: 2016-07-27
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0005] At present, the research on the field emission properties of graphene mainly focuses on two-dimensional

Method used

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  • Preparation method and application of nitrogen-doped graphene@SiO2 coaxial nanotube
  • Preparation method and application of nitrogen-doped graphene@SiO2 coaxial nanotube
  • Preparation method and application of nitrogen-doped graphene@SiO2 coaxial nanotube

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Embodiment 1

[0024] Commercially available analytically pure melamine was selected as the reaction raw material, as a carbon source and a nitrogen source, and high-purity CH 4 Gas (purity>99.99%) as supplementary carbon source, Si-SiO 2 Ball milling mixed powder (mass ratio Si: SiO 2 =1.5:1) is an auxiliary material. Weigh 12.6g of melamine and 2.04g of Si-SiO in a molar ratio of 2:1 2Ball mill the mixed powder, put it into an agate mortar and grind for 40 minutes; choose a circular graphite sheet with a diameter of 7cm, a thickness of 1mm and a smooth surface as the reaction substrate, clean and dry the graphite substrate in an ultrasonic cleaner, and then immerse it in to a pre-prepared molar concentration of 0.01mol Ni(NO 3 ) 2 Take it out after 5 minutes in the ethanol solution, and dry it in the air for later use; place the mixed raw material obtained by grinding on a carbon cloth, place the graphite substrate impregnated with the catalyst on top of the mixed raw material, and pla...

Embodiment 2

[0027] Commercially available analytically pure melamine was selected as the reaction raw material, as a carbon source and a nitrogen source, and high-purity CH 4 Gas (purity>99.99%) as supplementary carbon source, Si-SiO 2 Ball milling mixed powder (mass ratio Si: SiO 2 =1.5:1) is an auxiliary material. Weigh 9.45g of melamine and 2.04g of Si-SiO in a molar ratio of 1.5:1 2 Ball mill the mixed powder, put it into an agate mortar and grind for 40min; choose a circular graphite sheet with a diameter of 7cm, a thickness of 1mm and a smooth surface as the reaction substrate, clean and dry the graphite substrate in an ultrasonic cleaner, and then immerse it in to a pre-prepared molar concentration of 0.01mol Ni(NO 3 ) 2 Take it out after 5 minutes in the ethanol solution, and dry it in the air for later use; place the mixed raw material obtained by grinding on a carbon cloth, place the graphite substrate impregnated with the catalyst on top of the mixed raw material, and place...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped graphene@SiO2 coaxial nanotube. The nitrogen-doped graphene@SiO2 coaxial nanotube is prepared by taking melamine and methane as reaction raw materials, Si-SiO2 mixed powder as an auxiliary material and nickel nitrate as a catalyst and carrying out a template-free one-step chemical vapor reaction method in a vacuum atmosphere furnace. The template-free one-step chemical vapor reaction method provided by the invention has the advantages of simple process, low cost and high repeatability, and is easy to control, the tube diameter of the obtained nitrogen-doped graphene@SiO2 coaxial nanotube is 150-250 nanometers, the thickness of a SiO2 cladding layer is 6-8 nanometers, and the nitrogen-doped graphene@SiO2 coaxial nanotube has excellent field emission performance and can have wide application prospect in the fields such as a field emission flat-panel displayer, a vacuum electronic device, a large-screen LCD backlight module and a field emission lighting source.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation and field emission technology, in particular to nitrogen-doped graphene SiO 2 Preparation method of coaxial nanotubes and their application as field emission cathode materials. Background technique [0002] Graphene, as a new type of carbon material, is expected to be an ideal field emission cathode material due to its excellent electrical and mechanical properties. Khare et al. used a simple hydrothermal method to decompose multi-walled carbon nanotubes into graphene nanoribbons. The field emission performance test results of the product showed that the open electric field was 2.8V / μm (KhareR., ShindeD.B., BansodeS., MoreM.A., MajumderM., PillaiV.K., LateD.J.AppliedPhysicsLetters, 2015, 106(2):023111.); Stratakis et al. Synthesized a self-supporting The few-layer graphene sheet, the research shows that the graphene sheet is a very good electron emitter, and its opening electric fie...

Claims

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Application Information

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IPC IPC(8): H01J1/304C23C16/30B82Y30/00
CPCB82Y30/00C23C16/30H01J1/304
Inventor 李镇江宋冠英孟阿兰张猛李凯华
Owner QINGDAO UNIV OF SCI & TECH
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