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Preparation method for highly-nitrogen-doped graphene light-weight ferromagnetic material

A ferromagnetic material, graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of weak ferromagnetism and limited application prospects, and achieve the effect of good ferromagnetic performance

Inactive Publication Date: 2015-04-15
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, so far, the magnetic moments of all graphene-based materials obtained experimentally are very small, the largest is only 0.8emu / g (in an external field of 6.5T, at a temperature of 2K), and its intrinsic ferromagnetism is very weak
These greatly limit its potential application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0024] (1) 1 g of graphene oxide with 1 to 20 layers was added to 300 ml of 0.01 mol / l dilute nitric acid solution for cleaning, and then centrifuged at a centrifugal speed of 30,000 rpm to obtain a precipitate.

[0025] (2) Repeat step (1) twice, then add deionized water, centrifuge at 30,000 rpm to obtain a precipitate, repeat the process of adding deionized water and centrifuging 5 times to ensure that no other impurities are contained.

[0026] (3) Dilute the graphene oxide cleaned in step (2) to 0.02mg / ml, and dry it with a vacuum freeze dryer. The temperature of the vacuum freeze dryer is set at -60°C for 4 hours; then increase by 10 From 0°C to 0°C, keep each temperature range for half an hour; from 0°C to 35°C, increase by 5°C in turn, keep each temperature range for one hour, then keep at 35°C for 24 hours, ensure drying, and get fluffy graphene oxide .

[0027] (4) Put the fluffy graphene oxide obtained in step (3) into a tube furnace. The two sides of the container...

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Abstract

The invention discloses a preparation method for a highly-nitrogen-doped graphene light-weight ferromagnetic material. In the preparation method, highly-nitrogen-doped graphene is obtained by doping oxidized graphene by ammonia gas or melamine at a certain temperature. Tests indicate that the Curie temperature of the material is 100.7 K. Via a test at a temperature of 5K, the saturation moment is 1.8 emu / g under the external magnetic field of 6.5 T, and the saturation moment is 0.35 emu / g and the coercive force is 0.016 T under the external magnetic field of 0.05 T. The highly-nitrogen-doped ferromagnetic material prepared by the preparation method disclosed by the invention has a density which approximates the density of graphene, can show good ferromagnetic performance above liquid nitrogen temperature, and is a good light-weight ferromagnetic material.

Description

technical field [0001] The invention relates to a method for preparing a highly nitrogen-doped graphene light ferromagnetic material. Background technique [0002] Graphene, as the material with the smallest density, the largest specific surface area, and the best electrical conductivity in the world, has great application prospects in solar transparent electrodes, lithium batteries, and field effect transistors. [0003] The preparation methods of graphene mainly include micromechanical exfoliation, chemical vapor deposition, liquid phase exfoliation, and chemical methods. It is one of the very common methods to change the performance of graphene by doping other atoms, and the common doping methods are nitrogen doping, fluorine doping and chlorine doping, etc. Theoretical calculations show that through appropriate doping methods, the spin concentration of graphene can be increased to achieve a large magnetic moment, which can be widely used as a light ferromagnetic materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 唐涛李明
Owner GUILIN UNIVERSITY OF TECHNOLOGY