Study On Wave Absorption Properties Of Reduced Graphene Oxide Composites

Stealth technology has been used in military facilities such as aircrafts,ships,bridges,and tanks,which improves the penetration ability and increases survival rate.In this area,absorbing materials play a key role.The wave absorbing material is composed of absorbent with a specific medium electromagnetic Absorption Properties,and the absorbent have effect on the wave absorbing properties of the wave absorbing material.With the rapid development of nanotechnology,a single wave-absorbing material can not meet the needs of the aerospace field.Therefore it is important to prepare wave-absorbing material with superior wave-absorbing performance.As a new type of carbon material,graphene oxide has a unique single-layer structure that gives it special physical and chemical properties,which brings new opportunities for the study of new carbon-based electromagnetic wave absorbing materials.Graphene oxide has high electrical conductivity and thermal conductivity,large specific surface area and light weight.It is a relatively good absorbing material.MoS₂ is a kind of new material with S-Mo-S three-layer structure.It has special electrical,optical,mechanical properties and a wide bandgap.When rGO was modified by MoS₂,the electromagnetic wave absorption performance was improved.In this paper,M/MoS₂ was obtained by modifying MoS₂ with KH570,and then reduced graphene?rGO?was modified by M/MoS₂,and?M/MoS₂?/rGO composites were prepared.The structure of?M/MoS₂?/rGO composites were characterized by FITR,X-ray diffraction?XRD?,scanning electron microscopy?SEM?,and transmission electron microscopy?TEM?.The wave absorption properties of the?M/MoS₂?/rGO composites were measured by complex permittivity,Cole-Cole,and reflection loss?RL?.And the electromagnetic wave absorption mechanism of?M/MoS₂?/rGO composites was analyzed.The maximum reflection loss?RL?of?M/MoS₂?/rGO composites with the thickness of 3.0 mm is-49.7 dB.The?M/MoS₂?/rGO composite has strong absorption properties.Barium titanate?BaTiO₃?has good relaxation,scattering and phonon dissipation effects under periodic boundary conditions.And the relative permittivity decreased with the increasing frequency.There is a resonant peak at the narrow frequency of dielectric loss.Based on Ostwald ripening and cation exchange mechanism,BaTiO₃/rGO composites were prepared by hydrothermal method,and BaTiO₃ was grafted on the surface of rGO nanosheet.The structure of Ba TiO₃/rGO composites was characterized by FITR,XRD,SEM and TEM.The complex dielectric constant,Cole-Cole and RL were used to characterize the microwave absorbing properties of the BaTiO₃/rGO composites.Compared with pure BaTiO₃ nanotube,the BaTiO₃/rGO composites had superior electromagnetic wave absorption performance.The maximum reflection loss?RL?of BaTiO₃/rGO composites with the thickness of 3.0 mm is-44.9 dB.The BaTiO₃/rGO composite has strong absorption properties and can be used as a promising electromagnetic wave absorbing material.