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Method for preparing high-proportion graphite-type nitrogen-doped graphene tubes in one step without template

A graphite-type nitrogen and graphene tube technology, applied in the field of nanomaterials, can solve the problems of complex nitrogen-doped graphene tube process, low proportion of graphite-type nitrogen doping content, low purity of graphene tube, etc. The effect of easy mass production and high product purity

Active Publication Date: 2018-01-26
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to improve the process of preparing nitrogen-doped graphene tubes by the existing template method, which has complex processes, cumbersome steps, poor product stability, low purity of graphene tubes, and low graphite-type nitrogen-doped content in the product. Technical problem, to provide a simple, efficient, low-cost template-free method for preparing nitrogen-doped graphene tubes dominated by graphite-type N-doped

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  • Method for preparing high-proportion graphite-type nitrogen-doped graphene tubes in one step without template
  • Method for preparing high-proportion graphite-type nitrogen-doped graphene tubes in one step without template
  • Method for preparing high-proportion graphite-type nitrogen-doped graphene tubes in one step without template

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Embodiment 1

[0020]Select commercially available analytically pure melamine as the reaction raw material, Si powder with a purity of 99.5% as the auxiliary material, weigh 4.725g of melamine and 0.7g of the Si powder auxiliary material, put them into an agate mortar and grind for 40min; A round graphite sheet with a smooth surface was used as the reaction substrate. After the graphite substrate was cleaned and dried in an ultrasonic cleaner, it was immersed in a pre-prepared Ni(NO 3 ) 2 Ethanol solution for 5 minutes, take it out and dry it in the air for later use; place the mixed raw material obtained by grinding on the carbon cloth, place the graphite substrate impregnated with the catalyst on the top of the mixed raw material, and place it in the graphite reaction chamber at a distance of 3-5mm from the raw material , and then put the graphite reaction chamber into the vacuum controllable atmosphere furnace; start the vacuum system, evacuate the vacuum controllable atmosphere furnace t...

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Abstract

The invention discloses a method for preparing a high-ratio graphite-type nitrogen-doped graphene tube in a template-free one-step method. The method comprises the following steps: taking melamine as a reaction raw material, silicon powder as an auxiliary material and nickel nitrate as a catalyst, heating a vacuum atmosphere furnace to 1200 to 1250 DEG C by adopting a one-step chemical gaseous reaction method, keeping the temperature for 20 to 30 min, then introducing methane gas for 5 to 10 minutes, turning off a power supply, and cooling to the room temperature along with the furnace. The method is simple in process, easy to control, and capable of avoiding the complicated procedures of a template method and avoiding the damage on a tube structure in the template removal process; the obtained nitrogen-doped graphene tube is high in purity, uniform in structure and good in repeatability; and the tube diameter is 200 to 300 nm, the thickness of the tube wall is 6 to 8 nm, and the nitrogen-doped structure in the product is domain on the graphite-type nitrogen. The nitrogen configuration can effectively improve the electrical performance of the product and is suitable for the fields of novel vacuum micro-electronic devices, nano photoelectron devices and super capacitors.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a template-free, one-step chemical gas phase reaction method for preparing high-proportion graphite-type nitrogen-doped graphene tubes. Background technique [0002] Graphene is a two-dimensional periodic honeycomb lattice structure composed of carbon six-membered rings, and is the basic unit for constructing other dimensional carbon materials. In recent years, graphene has rapidly become a hot material in the fields of materials science, chemistry, and condensed matter physics. In order to expand the application field of graphene materials, researchers often adjust the properties of graphene by doping and modifying it. A large number of theoretical and experimental works have shown that introducing N, B and other atoms into graphene sheets can effectively realize the transformation of graphene from a zero-band gap semi-metal to a semiconductor, forming n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/182B82Y40/00
CPCB82Y40/00
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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