Highly-efficient microwave absorptivity in reduced graphene oxide modified with PTA@ imidazolium based dicationic ionic liquid and fluorine atom
| Autor: | Seeram Ramakrishna, Mohadese Mohamadi, Amutha Chinnappan, Vahid Haddadi-Asl, Maryam Yousefzadeh, Elaheh Kowsari |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Reflection loss General Engineering Oxide 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound symbols.namesake chemistry Chemical engineering X-ray photoelectron spectroscopy law Ionic liquid Ceramics and Composites symbols Fourier transform infrared spectroscopy Composite material 0210 nano-technology Raman spectroscopy |
| Zdroj: | Composites Science and Technology. 188:107960 |
| ISSN: | 0266-3538 |
| DOI: | 10.1016/j.compscitech.2019.107960 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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