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.

中文翻译：

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PTA@咪唑鎓基双阳离子离子液体和氟原子改性还原氧化石墨烯的高效微波吸收

摘要 本研究介绍了精心设计的具有高微波 (MW) 吸收性能的改性氧化石墨烯 (GO) 的制备，其中包括磷钨酸-咪唑基双阳离子离子液体 (PTA@Imid diIL) 和表面氟原子的共价连接。去。通过 XPS、FTIR、拉曼光谱、FESEM 和 TEM 指定了所制备的 PTA@Imidazolium 基双阳离子离子液体在氟化氧化石墨烯 (PTA@Imid diIL-FGO) 表面上的结构和形貌。GO与PTA@Imid diIL和氟原子连接后的独特结构不仅有效减少了GO的团聚，而且引起了高极性、高介电性能以及多重散射和极化。作为一种 MW 吸收材料，PTA@Imid diIL-FGO/环氧树脂复合材料是在不同负载的 PTA@Imid diIL-FGO（10-60 重量％）下产生的，它们在 8.0-12.0 GHz 范围内强烈吸收 MW。例如，PTA@ Imid diIL-FGO/环氧树脂复合材料在加载 50 wt% PTA@ Imid diIL-FGO 时表现出 -39 dB 的反射损耗 (RL) 值，吸收体厚度为 2.0 mm，带宽与 RL 一致小于−10 dB 可以达到 2.5 GHz（从 9.5 GHz 到 12 GHz）。该研究表明，具有极性悬空官能团的 PTA@Imid diIL-FGO 可用于吸收增强的 MW 特性。例如，PTA@ Imid diIL-FGO/环氧树脂复合材料在加载 50 wt% PTA@ Imid diIL-FGO 时表现出 -39 dB 的反射损耗 (RL) 值，吸收体厚度为 2.0 mm，带宽与 RL 一致小于−10 dB 可以达到 2.5 GHz（从 9.5 GHz 到 12 GHz）。该研究表明，具有极性悬空官能团的 PTA@Imid diIL-FGO 可用于吸收增强的 MW 特性。例如，PTA@ Imid diIL-FGO/环氧树脂复合材料在加载 50 wt% PTA@ Imid diIL-FGO 时表现出 -39 dB 的反射损耗 (RL) 值，吸收体厚度为 2.0 mm，带宽与 RL 一致小于−10 dB 可以达到 2.5 GHz（从 9.5 GHz 到 12 GHz）。该研究表明，具有极性悬空官能团的 PTA@Imid diIL-FGO 可用于吸收增强的 MW 特性。