Dielectric characterization and microwave absorption of expanded graphite integrated polyaniline multiphase nanocomposites in X-band
| Autor: | Jyoti Prasad Gogoi, Utpal Jyoti Mahanta, Dipangkar Borah, Nidhi S. Bhattacharyya |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Nanocomposite Materials science Scanning electron microscope Reflection loss Dielectric 01 natural sciences chemistry.chemical_compound chemistry 0103 physical sciences Polyaniline Graphite Electrical and Electronic Engineering Composite material In situ polymerization Microwave |
| Zdroj: | IEEE Transactions on Dielectrics and Electrical Insulation. 26:194-201 |
| ISSN: | 1558-4135 1070-9878 |
| DOI: | 10.1109/tdei.2018.007443 |
| Popis: | Design optimization for broadband microwave absorption and fabrication of a metal backed single layer microwave absorber based on polyaniline (PA)/expanded graphite (EG) reinforced novolac phenolic resin (NPR) composites was investigated in the frequency ranges of 8.2–12.4 GHz. To study the effect of multiphase reinforcers on microwave absorption, PA/EG reinforcers were synthesized by in situ polymerization of aniline in acid medium followed by incorporation of EG in (x=0.15 and 0.25 wt%) proportions and characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy (TEM) analysis. TEM analysis showed that polyaniline of dimension 1.5 and 0.25 for 30 and 20 wt % composites respectively, showing as viable dielectric microwave absorbing materials. Reflection loss (RL) values for different composites were optimized by varying the thickness based on transmission line theory and a RL∼ −32 dB at 9.7 GHz with −10 dB bandwidth of 2.4 GHz is obtained for single layer absorber fabricated from 30 wt% composites of thickness 3.0 mm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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