Highly-efficient microwave absorptivity in reduced graphene oxide modified with PTA@ imidazolium based dicationic ionic liquid and fluorine atom

Abstract

This study introduces fabrication of well-designed modified graphene oxide (GO) with highly microwave (MW) absorption performance, which includes covalently connection of the phosphotungstic acid-imidazolium based dicationic ionic liquid (PTA@ Imid diIL) and Fluorine atom on the surface of GO. The structure and morphology of as-prepared PTA@ Imidazolium based dicationic ionic liquid interlocked on the surface of fluorinated graphene oxide (PTA@ Imid diIL- FGO) were specified by XPS, FTIR, Raman spectroscopy, FESEM and TEM. The unique structure of GO after being connected to PTA@ Imid diIL and fluorine atom not only effectively reduced the agglomeration of GO, but also caused high polarity, high dielectric properties as well as multiple scattering and polarization. As an MW absorbing material the PTA@ Imid diIL- FGO/epoxy resin composites were created at various loading of PTA@ Imid diIL- FGO (10–60 wt %), and they absorbed strongly the MW in the 8.0–12.0 GHz range. For example the PTA@ Imid diIL- FGO/epoxy resin composite exhibited the reflection loss (RL) values of −39 dB at loading of 50 wt % PTA@ Imid diIL- FGO with absorber thickness of 2.0 mm and the bandwidth consistent with the RL less than −10 dB can reach 2.5 GHz (from 9.5 GHz to 12 GHz). This research showed that the PTA@ Imid diIL- FGO with polar dangling functional groups is useful to absorb the enhanced MW properties.