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Investigation of Microwave Absorption Performance of CoFe(2)O(4)/NiFe(2)O(4)/Carbon Fiber Composite Coated with Polypyrrole in X-Band Frequency

The current research reports the preparation of a microwave absorber containing CoFe(2)O(4)/NiFe(2)O(4)/Carbon fiber (H/S/CF) coated with polypyrrole polymer (PPy@H/S/CF) through sol-gel and in-situ polymerization processes. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM...

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Detalles Bibliográficos
Autores principales: Sadeghi, Rozhin, Sharifi, Abbas, Orlowska, Marta, Huynen, Isabelle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569893/
https://www.ncbi.nlm.nih.gov/pubmed/32858924
http://dx.doi.org/10.3390/mi11090809
Descripción
Sumario:The current research reports the preparation of a microwave absorber containing CoFe(2)O(4)/NiFe(2)O(4)/Carbon fiber (H/S/CF) coated with polypyrrole polymer (PPy@H/S/CF) through sol-gel and in-situ polymerization processes. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM), and a vector network analyzer (VNA) are utilized to evaluate the features of the prepared composite. The microstructure analysis results revealed carbon fibers well decorated with submicron-size particles having hard/soft magnetic phases and thoroughly coated with polymer. The paraffin-based microwave absorber sample filled with 45 wt.% of PPy@H/S/CF has simultaneously both magnetic and dielectric losses in the 8.2–12.4  GHz frequency range. The absorber is used in a Salisbury screen configuration aiming at reducing the radar cross-section of objects. A minimum reflection loss of −55  dB at 10.6 GHz frequency with 5 GHz bandwidth is obtained for the sample with a 2  mm thickness. Different mechanisms, such as interfacial polarization, ferromagnetic resonance, and electron hopping, are the main factors for achieving such an appropriate microwave absorption. These results suggest that the PPy@H/S/CF composite is an ideal candidate for microwave absorption applications requiring high performance and low thickness.