Method for directly synthesising nitrogen-doped graphene by simply using solid nitrogen source

Abstract

The invention belongs to the technical field of preparation of carbon nanomaterials, and provides a novel method for synthesising nitrogen-doped graphene by taking melamine as a main nitrogen and carbon source and methane as an auxiliary carbon source through a chemical vapour deposition method under the normal-pressure condition. Other catalysts, except for a metal substrate, and a conventional gas or liquid nitrogen source are not used in the method; therefore, the method is low in cost, non-toxic, simple and convenient to operate and convenient in process application; furthermore, no specific requirement for equipment exists in the reaction process; other heating devices, except for a main heating device, are unnecessary; therefore, the method is high in operability and is applied to practical popularization; the temperature of copper is slowly increased in the low-temperature stage at first; a nitrogen source and a carbon source are simultaneously introduced into a tubular furnace for one time when the temperature of copper reaches reaction temperature; then, the temperature is rapidly decreased to room temperature after completing reaction; at the time, a layer of nitrogen doped graphene film is formed on the surface of metal; and structural regulation and control, such as the doping amount and doping type of nitrogen in graphene and the thickness and crystallization degree of graphene, can be realized through the parameters, such as the optimized nitrogen source amount, temperature matching of front and rear temperature areas, the reaction time and the reaction temperature.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterial preparation, and relates to a method of synthesizing nitrogen-doped graphene in one step in a CVD process using melamine as a nitrogen source without adding a catalyst. The instrument used in the reaction process is simple, the process is simple, and no main heating equipment Methods other than CVD synthesis of graphene with heating equipment. Background technique [0002] Graphene as a unique sp 2 The stable hexagonal lattice structure of the hybrid two-dimensional single-layer material endows graphene with many excellent physical and chemical properties (Geim A K.science, 2009, 324, 1530.). For example, its thermal conductivity (3000W / (m K)) is 10 times that of copper (397W / (m K)), Young's modulus reaches 1.0TPa, and its hardness is greater than that of diamond. It is currently the hardest material in nature. In addition, graphene also has ultra-high electron mobility at room tempe...

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Problems solved by technology

Wang's research group used melamine as a nitrogen source (Wang Z, et al. Journal of Materials Chemistry C, 2014, 2, 7396.), and the nitrogen doping amount of the synthesized product was 5.6%, but the process used low pressure conditions and additional heating device, the process is more complex

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