Fabrication, characterization and electromagnetic wave absorption properties of covalently modified reduced graphene oxide based on dinuclear cobalt complex
| Autor: | Mohadese Mohamadi, Elaheh Kowsari, Vahid Haddadi-Asl, Maryam Yousefzadeh |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Composite number Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering law.invention symbols.namesake chemistry.chemical_compound X-ray photoelectron spectroscopy law Composite material Graphene Mechanical Engineering Reflection loss Epoxy 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials visual_art Ceramics and Composites symbols visual_art.visual_art_medium 0210 nano-technology Raman spectroscopy Cobalt |
| Zdroj: | Composites Part B: Engineering. 162:569-579 |
| ISSN: | 1359-8368 |
| Popis: | We are reporting on well-designed single-layered and gradient concentration triple-layered microwave-absorbing composites based on functionalized reduced graphene oxide (FRGO). The RGO-[Co2L2Cl3]Cl, called FRGO, was fabricated through systematic experimental efforts by the covalent attachment of the 2,6-diamino-3-[(2-carboxylicacid) phenylazo]-pyridine (L)/Cobalt (Co) complex with graphene oxide (GO) functionalities. The formation of FRGO was proven by a series of characterization techniques, such as XPS, FTIR, XRD, Raman spectroscopy, FESEM, and TEM. The consideration of RGO-[Co2L2Cl3]Cl as a highly efficient microwave-absorbing material is a result of its magnetoelectric synergistic effect, impedance match, and multiple scattering. The maximum reflection loss (RL) of single-layered an RGO-[Co2L2Cl3]Cl/epoxy resin composite can reach −16.32 dB at 8.69 GHz, which corresponds to a composite with 30 wt % absorber loading and a thickness of 4.5 mm. For the triple-layered composite with increasing mass percentage (10–20–30 wt %) of RGO-[Co2L2Cl3]Cl in the direction of microwave propagation, the maximum reflection loss value of −34.9 dB can be achieved at 10.69 GHz, with a coating layer thickness of 4.5 mm. The result demonstrates that the RGO-[Co2L2Cl3]Cl/epoxy resin composites of both models can be ideal microwave-absorbing candidates for application in the X-band. |
| Databáze: | OpenAIRE |
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