Reduced graphene oxide and nano cerium oxide composite microwave absorbing material and preparation method thereof

Abstract

The invention specifically relates to a reduced graphene oxide and nano cerium oxide composite microwave absorbing material and a preparation method thereof. The method comprises the following steps: preparing graphene oxide by using an improved Hummers method; mixing a graphene oxide aqueous solution with cerium nitrate in a mass ratio of 1:25, and adjusting the pH value to 10; and by using a one-step hydrothermal method, simultaneously generating nano cerium oxide and reducing the graphene oxide, so that a reduced graphene oxide and nano cerium oxide composite microwave absorbing material is obtained. The microwave absorption parameters of the composite material are tested by using a vector network analyzer, and the microwave reflection loss of the composite material is calculated by using a classical coaxial line theory. Results show that the reduced graphene oxide and nano cerium oxide composite microwave absorbing material has excellent microwave absorbing properties, high absorption strength and wide absorption band, and compared with nano cerium oxide, the microwave absorbing properties are greatly improved. Thus, the reduced graphene oxide and nano cerium oxide composite microwave absorbing material disclosed by the invention has broad application prospects, and is of great significance to the expansion of industrial application of rare earth oxides and the national defense construction.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a microwave absorbing material and a preparation method. Background technique [0002] With the development of military stealth technology and civilian anti-electromagnetic interference technology, microwave absorbing materials (referred to as absorbing materials) have become a research hotspot, and this type of material has gradually become an important branch of applied functional materials. Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert their electromagnetic energy into heat or other forms of energy and dissipate them, or make electromagnetic waves disappear due to interference. [0003] The main disadvantages of traditional absorbing materials, such as ferrite, graphite, and ceramics, are high density, narrow absorption frequency band, and insufficient absorption strength, so the...

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Problems solved by technology

[0003] The main disadvantages of traditional absorbing materials, such as ferrite, graphite, and ceramic materials, are high density, narrow absorption frequency band, and insufficient absorption strength, etc., so they cannot meet the requirements of "thin, light, wide, and strong" absorbing materials

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