1. MWCNT decorated Magnetic/Ceramic/Polymer (Fe2O3/Fe3O4/SiO2/PANI) nanocomposite with enhanced microwave absorption at an entire X and Ku frequency bands.
- Author
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Saeed, Mohammad Shamsaddin and Hekmatara, Hoda
- Subjects
- *
NANOCOMPOSITE materials , *POLYMERS , *CERAMICS - Abstract
Two new magnetic/ceramic/carbon and magnetic/ceramic/polymer/carbon nanocomposites were created by decorating the surface of MWCNT with magnetic/ceramic (Fe 2 O 3 /Fe 3 O 4 /SiO 2 NPs) and magnetic/ceramic/polymer (Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI). First, in order to have a narrow size distribution and high saturation magnetization, Fe 2 O 3 /Fe 3 O 4 NPs were produced successively under ideal conditions. Subsequently, Fe 2 O 3 /Fe 3 O 4 NPs were produced by coating them with a thin layer of SiO 2. Fe 2 O 3 /Fe 3 O 4 /SiO 2 /MWCNT nanocomposite was created by applying Fe 2 O 3 /Fe 3 O 4 /SiO 2 /NPs at a specified weight ratio (1/2) to the MWCNT surface. Subsequently, Fe 2 O 3 /Fe 3 O 4 /SiO 2 NPs were utilized as an initiator to polymerize the aniline; as a result, Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI NPs were created and the polyaniline grew at their surface. Ultimately, Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI NPs were added to MWCNT at a weight ratio of 1/2, resulting in the synthesis of a Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI/MWCNT nanocomposite. XRD, SEM, and TEM pictures verified the effective synthesis of Fe 2 O 3 /Fe 3 O 4 /SiO 2 /MWCNT and Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI/MWCNT nanocomposites. By evaluating their EM characteristics, the microwave absorption properties of these composites were characterized. The findings shown that for the Fe 2 O 3 /Fe 3 O 4 /SiO 2 /MWCNT nanocomposite with an effective bandwidth of 5.7 GHz, the minimum reflection loss reached −18.5 dB. For the Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI/MWCNT nanocomposite, there was a considerable improvement in both minimum reflection loss and bandwidth in comparison with similar composites. The Fe 2 O 3 /Fe 3 O 4 /SiO 2 /PANI/MWCNT demonstrated a minimum reflection loss of −87dB over whole frequency range (8–18 GHz) with an effective bandwidth. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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