Sulfur and nitrogen double-doped graphene wave-absorbing material, production method and wave-absorbing performance adjusting method

Abstract

The invention relates to the field of production of wave-absorbing materials, in particular to a sulfur and nitrogen double-doped graphene wave-absorbing material, a production method and a wave-absorbing performance adjusting method. The production method of the wave-absorbing material comprises the steps of (1) producing graphite oxide by means of a hummers method, and producing a graphite oxidesolution; and (2) taking a reducing agent containing sulfur and nitrogen, adding the produced graphite oxide solution, conducting heating to elevate temperature to 80-100 DEG C, carrying out a constant temperature reaction continuously for 1-3 h, after the reaction is completed, conducting cooling to reduce the temperature to room temperature, conducting washing filtering by means of deionized water, and conducting freeze drying to obtain the black sulfur and nitrogen double-doped graphene powder. Compared with other heteroatom-doped graphene materials and most graphene composite materials, the produced sulfur and nitrogen double-doped graphene wave-absorbing material has higher wave-absorbing characteristics and an adjustable wave band; and by producing the sulfur and nitrogen double-doped graphene wave-absorbing material through a chemical wet method, the reaction condition changes from high-temperature annealing to a low-temperature reaction, and not only is energy consumption greatly reduced, but also production of a liquid-phase material which is liable to be processed into a film is achieved, so that industrial large-scale production is facilitated.

Description

technical field [0001] The invention relates to the field of preparation of wave-absorbing materials, in particular to a sulfur-nitrogen double-doped graphene wave-absorbing material and a method for preparing and adjusting wave-absorbing performance. Background technique [0002] Under the current trend of electromagnetic wave absorbing materials gradually developing towards high performance, light weight, and flexibility, high electrical conductivity, excellent mechanical properties, and ultra-high specific surface area make graphene a very promising electromagnetic wave absorbing filling material. At present, there are three methods to construct graphene-based wave-absorbing materials. One is to effectively improve the electromagnetic wave absorption performance by combining graphene with magnetic ferrite, conductive polymers, sulfur-oxygen compounds and other materials. The second is to construct a graphene 3D porous framework, so that the electromagnetic waves entering ...

AI Technical Summary

Problems solved by technology

However, a common problem in these studies is that a graphene-based material is optimized to only have a strong absorption capacity for a specific frequency band of electromagnetic waves

However, it needs to be realized by freeze-drying technology, the equipment is expensive, and it cannot be mass-produced; and the product is difficult to form into a film, which is not conducive to application and promotion

[0005] It has been reported in the literature that the energy bandgap, electronic density of states, and interface properties of graphene can be adjusted by doping heteroatoms such as N and F, so as to achieve the purpose of absorbing waves, but the absorbing performance is not high and the full band cannot be adjusted. absorb

[0006] It has been reported in the literature that S-doped graphene is prepared by high-temperature annealing to achieve electromagnetic shielding, but it does not have microwave-absorbing properties.

However, the chemical wet S-doped graphene has not been used for the preparation of absorbing materials.

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