High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures

With the rapid development of fifth-generation mobile communication technology and wearable electronic devices, electromagnetic interference and radiation pollution caused by electromagnetic waves have attracted worldwide attention. Therefore, the design and development of highly efficient EMI shielding materials are of great importance. In this work, the three-dimensional graphene oxide (GO) with regular honeycomb structure (GH) is firstly constructed by sacrificial template and freeze-drying methods. Then, the amino functionalized FeNi alloy particles (f-FeNi) are loaded on the GH skeleton followed by in-situ reduction to prepare rGH@FeNi aerogel. Finally, the rGH@FeNi/epoxy EMI shielding composites with regular honeycomb structure is obtained by vacuum-assisted impregnation of epoxy resin. Benefitting from the construction of regular honeycomb structure and electromagnetic synergistic effect, the rGH@ FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt% (rGH andf-FeNi are 1.2 and 0.9 wt%, respectively) exhibit a high EMI shielding effectiveness (EMI SE) of 46 dB, which is 5.8 times of that (8 dB) for rGO/FeNi/epoxy composites with the same rGO/FeNi mass fraction. At the same time, the rGH@FeNi/epoxy composites also possess excellent thermal stability (heat-resistance index and temperature at the maximum decomposition rate are 179.1 and 389.0 degrees C respectively) and mechanical properties (storage modulus is 8296.2 MPa).

Automated summary

With the rapid development of fifth-generation mobile communication technology and wearable electronic devices, the need for highly efficient EMI shielding materials has become crucial. In this study, a three-dimensional graphene oxide (GO) with regular honeycomb structure (GH) was constructed using sacrificial template and freeze-drying methods. Amino functionalized FeNi alloy particles (f-FeNi) were loaded onto the GH skeleton followed by in-situ reduction to prepare rGH@FeNi aerogel. The resulting rGH@FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt% exhibited a high EMI shielding effectiveness (EMI SE) of 46 dB, which is 5.8 times higher than that of rGO/FeNi/epoxy composites with the same mass fraction. The composites also displayed excellent thermal stability and mechanical properties.