Method for preparing nitrogen-doped graphene

Abstract

The invention belongs to the field of graphene, and particularly relates to a method for preparing nitrogen-doped graphene. The method includes steps of 1, adding graphene oxide into absolute ethyl alcohol, uniformly stirring the graphene oxide and the absolute ethyl alcohol, then carrying out ultrasonic reaction for 20-30 min and naturally cooling reaction products to obtain graphene oxide aqueous alcohol solution; 2, adding alkali liquor into the graphene oxide aqueous alcohol solution, uniformly stirring the alkali liquor and the graphene oxide aqueous alcohol solution, then carrying out sealed microwave reaction for 30-60 min, cooling and then filtering reaction products, washing the reaction products until the reaction products are neutral and drying the reaction products to obtain alkalized graphene; 3, adding melamine into methanol, and heating and stirring the melamine and the methanol until the melamine and the methanol are completely dissolved so as to obtain melamine and methanol solution; 4, slowly adding the alkalized graphene into the melamine and methanol solution, and stirring the alkalized graphene and the melamine and methanol solution until the alkalized grapheneis completely dispersed so as to obtain mixed reaction liquid; 5, adding the mixed reaction liquid into a reaction kettle, carrying out microwave heating reaction for 2-5 h, and then carrying out quick cooling and decompressing to obtain melamine-graphene precipitates; 6, placing the melamine-graphene precipitates into a nitrogen vacuum reaction kettle, carrying out sealed heating reaction for 10-12 h and cooling reaction products to obtain the nitrogen-doped graphene.

Description

technical field [0001] The invention belongs to the field of graphene, in particular to a preparation method of nitrogen-doped graphene. Background technique [0002] As a semiconductor with zero energy gap, an important prerequisite for the application of graphene in microelectronic devices is that its band gap and carrier concentration can be adjusted, and chemical doping is an effective means to achieve this adjustment. Therefore, the doping of graphene has become a hot spot for researchers in many disciplines of physics, chemistry and materials science. The preparation of doped graphene is of great significance for in-depth study of its application in the field of nanoelectronics. [0003] The doping of graphene was first proposed by physics researchers. So far, various theoretical models of doped graphene have been established. Theoretical research results show that the introduction of heteroatoms such as N and B into the graphene sheet can effectively realize the tra...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention provides a method for preparing nitrogen-doped graphene, which solves the problems that the existing method for preparing nitrogen-doped graphene is relatively dangerous and has high cost. The preparation method provided has simple conditions and is controllable. Strong, suitable for mass production