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Microwave Absorption in MWNTs‐Based Soft Composites Containing Nanocrystalline Particles as Magnetic Core and Intrinsically Conducting Polymer as a Conductive Layer
Author(s) -
Bhingardive Viraj,
Woldu Tesfakiros,
Biswas Sourav,
Kar Goutam Prasanna,
Thomas Sabu,
Kalarikkal Nandakumar,
Bose Suryasarathi
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601056
Subject(s) - materials science , composite material , polyaniline , composite number , nanocrystalline material , coating , conductive polymer , electromagnetic shielding , microwave , polymer , carbon nanotube , layer (electronics) , nanotechnology , polymerization , physics , quantum mechanics
Microwave absorbers derived using poly(vinylidene fluoride) (PVDF), super paramagnetic nanocrystalline calcium ferrite (CaFe 2 O 4 ) and multiwall nanotubes (MWNTs) were developed in this study. Effect of in‐situ modification of CaFe 2 O 4 and MWNTs with a conducting layer, (polyaniline, PANI) on different properties of the composite has been investigated systematically. Two approaches were investigated here to gain insight into the mechanism of microwave absorption. Firstly, coating PANI onto CaFe 2 O 4 and blending along with MWNTs; secondly, coating PANI onto MWNTs and blending along with CaFe 2 O 4 . The electrical and magnetic properties of various composites containing hybrid particles were evaluated. Interestingly, the PVDF composites containing PANI coated CaFe 2 O 4 blended together with MWNTs showed excellent shielding effectiveness (‐57 dB at 18 GHz) as compared to the second approach where PANI was coated onto MWNTs and blended along with CaFe 2 O 4 . This was discussed here with respect to the relative permittivity and permeability in a wide range of frequency.