Effect of Polyaniline on Magnetic and Microwave Absorption Properties in SrFe 12 O 19 /Zn 0.4 Co 0.2 Ni 0.4 Fe 2 O 4 Fer
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Effect of Polyaniline on Magnetic and Microwave Absorption Properties in SrFe12O19/Zn0.4Co0.2Ni0.4Fe2O4 Ferrite Nanocomposites Faezeh Tavakolinia1 · Mohammad Yousefi2 · Seyyed Salman Seyyed Afghahi3 · Saeid Baghshahi4 · Susan Samadi2 Received: 9 February 2020 / Accepted: 12 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Polyaniline PANI/(SrFe12O19)(1-x)/(Co0.8Ni0.2Fe2O4)(x) (x = 0.2, 0.4, 0.6, 0.8) composites were prepared via the in situ polymerization process. The structure, morphology and electromagnetic absorption properties of samples were studied. XRD (x-ray diffractometer), FESEM (field emission scanning electron microscopy), and FTIR (field transform infrared) analyses demonstrated that SrFe12O19/Zn0.4Co0.2Ni0.4Fe2O4 ferrite particles were covered by PANI coating. VSM measurement revealed by adding non-magnetic polymer (PANI), magnetic features of aimed composites declined. The electromagnetic absorption of synthesized samples was measured by VNA. In the frequency range of 8.2–12.4 GHz (X-Band), the reflection loss improved to − 28.5 dB from − 2.93 dB composites of PANI/(SrFe12O19)0.2/(Zn0.4Co0.2Ni0.4Fe2O4)0.8 in comparison to ( SrFe12O19)0.2/ (Zn0.4Co0.2Ni0.4Fe2O4)0.8. Due to the perfect impedance matching between PANI as the dielectric part, and ferrites in the case of the magnetic part, the reflection loss decreased in PANI/(SrFe12O19)(1-x)/(Co0.8Ni0.2Fe2O4)(x) composites. The minimum reflection loss of the PANI/SrFe12O19/Zn0.4Co0.2Ni0.4Fe2O4 composites was − 28.6 dB at the frequency of 11.5 GHz. Graphic Abstract
Keywords Hard/soft composites · Magnetisation · Polyaniline · Reflection loss · Impedance matching
1 Introduction * Mohammad Yousefi [email protected]
Microwave-absorbing materials have been developed recently for military stealth applications and the hindrance of electromagnetic interferences. Conducting polymer
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nanocomposites such as polyaniline and polythiophene have been utilized in remarkable domains as microwave absorbing materials, batteries, and shielding equipment [1, 2]. Polyaniline with high electrical conductivity, easy preparation, and excellent environmental stability is one of the promising candidates for microwave absorption applications [3, 4]. The magnetic fillers such as soft spinel ferrite and hard M-type ferrite with high saturation magnetization, stability, and high remanence were added to the polymer for enhancing the electromagnetic absorption properties [5–7]. Various methods like polymerization, microemulsion polymerization, electrochemical, and electrospinning, were used for preparing polymer/ferrite nanocomposites [8–11]. Among them, the sol–gel process was a cost-effective and affordable preparation of ferrites that fabricated prominent microwave-absorbing material with special properties as lessened thickness, wider bandwidth, and adjustable impedance matching properties (matching dielectric and magnetic part). A co
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