Effect Of Interfacial Interaction Between Carbon And Nonmetallic Materials On Wave Absorption Performance

Electromagnetic radiation and electromagnetic interference have serious effects on our daily life and human health.At the same time,it will bring great threat to military and related information security.In order to solve the problem of electromagnetic pollution,microwave materials are required to be low cost,strong absorption intensity,wide absorption band,low density,convenient processing and so on.Nowadays,carbon-based materials have attracted great attention in many research fields such as heterogeneous catalysis,electrocatalysis,fuel cell and battery.Biochar has the advantages of low price,wide source,special form and so on,and has the characteristics of high conductivity,good dielectric loss,good stability and light weight.Therefore,they are also widely studied and used in efficient metal-free electromagnetic absorption materials.This paper has designed based on the sources of biomass carbon materials through a series of ways and non-metallic material combined with each other,by extending the microwave absorption path,increasing the interfacial polarization,improve the dipole polarization,low density in keeping the carbon material itself under the premise of further absorption strength is strong,the characteristics of the absorption band width,resulting in the microwave absorbing properties of the ideal,and it is expected to be further put into practice.The main research results are as follows:1: The sources and rice husk as a waste of agricultural production as the foundation,by oxygen plasma treatment technology,under the condition of natural growth of silicon dioxide on the surface of a after carbonized rice husk bombardment,by removing part of the silica at the same time,the preparation of a small hole on the surface,also maintain the original appearance of the sample good.And through a series of comparative experiments,it was found that the morphology of rice husk-derived biochar began to collapse and the sample lost its microwave absorption ability after the complete removal of the silica in rice husk by chemical methods,which confirmed the influence of the carbon-silicon heterogeneous interface on the wave absorption performance of rice husk-derived biochar.2: The grapefruit peel with special morphology and structure was carbonized at high temperature to obtain a large two-dimensional morphology and structure of carbon materials.The one-step hydrothermal method was used to compound with twodimensional boron nanosheets to construct a large area of biochar and boron nanosheets contact surface,improve the interface polarization and obtain good microwave absorption performance.Compared with physical mixed samples,it is proved that the construction of large area interfacial polarization can improve the microwave absorption performance.In general,a series of experimental results confirmed the positive effect of the carbon-silicon heterointerface in rice husk-derived biochar on the wave absorption performance of the material,and also confirmed the improvement of the wave absorption performance of the material by the non-covalent heterointerface between the hydrothermal construction of grapefruit peel-derived biochar and boron nanosheets.