Preparation And Performance Of Epoxy/Graphene-Carbon Nanotube Composites

Preparation of materials with effective electromagnetic interference shielding have attracted increasing interest because of rapid development in electronics industry and the harm of electromagnetic pollution.In recent progress on electromagnetic interference shielding composite material,polymer composite materials embedded with carbon-based nanofiller have various advantages such as being lightweight,having excellent processing performance and graphene have attracted wide attention because of its excellent performance.To solve the problem of the high filler content,the three-dimensional?3D?structure have been pursued for this purpose.In this work,we highlight the synthesis of 3D graphene with directional structure showing elasticity use a modified hydrothermal approach and subsequent oriented freeze-casting process.We report a facile method preparation of 3D graphene supported nickel nitrate and urea as precursor and cabothermal synthesis of nickel nanoparticles as catalyst of chemical vapor deposition,and subsequent successful synthesis of hybrid,also proved on 3D graphene thermal annealinged by 2800°C.To obtain small diameter long carbon nanotube,we also have explored supercritical CO₂-assisted depositon and thermal annealinged 3D graphene supported Fe₃O₄ nanoparticels by facile dip-coating and successful synthesis of Fe₃O₄@Al₂O₃ binary catalyst.In this work,composites were prepared by impregnating expoxy into preformed 3D hybrid through a facile vacuum assisted method.An outstanding electromagnetic interference shielding effectiveness of 42.54 dB were achieved for the composite materials at a low content of 0.39 wt%and the special electromagnetic shielding effectiveness of 4250 dB.cm2/g were achieved.