Synthesis of the morphology-controlled porous Fe 3 O 4 nanorods with enhanced microwave absorption performance
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Synthesis of the morphology‑controlled porous Fe3O4 nanorods with enhanced microwave absorption performance Zhenguo Fang1 · Shipeng Wang1 · Xiangkai Kong1 · Qiangchun Liu1 Received: 17 November 2019 / Accepted: 20 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The porous Fe3O4 nanorods have been successfully fabricated via a facile and energy-efficient hydrothermal method based on SiO2-coated β-FeOOH nanorods as a precursor. The effect of SiO2 coating on the phase structure and morphology of as-prepared samples have been systematically characterized by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscope (TEM). SEM and TEM results reveal that the F e3O4 nanorods possess one-dimension configuration and the porous structure. The complex permittivity and permeability of the sample are studied in the frequency range of 2.0–18.0 GHz with 55 wt% of porous Fe3O4 nanorods in paraffin. For the Fe3O4 nanorods, the maximum reflection loss (RL) is − 41.5 dB at 10.24 GHz and the effective absorption bandwidth below − 10 dB can achieve 5.2 GHz (9.28–14.48 GHz) with a matching thickness of 2.4 mm. The enhanced microwave absorption performance is mainly originated from multi-reflection between nanorods and interface polarization, which is related to special rod configuration and the porous structure of the porous F e3O4 nanorods. This work proposes a promising method to tune the microwave absorption performance via morphology control.
1 Introduction Currently, with the rapid development of electronic devices (such as personal smartphones, personal computer, wireless network, etc.), more and more unwanted electromagnetic (EM) waves were radiated out to the surrounding environment, which was detrimental to the biological systems, information secrets, electrical systems stability [1–3]. In addition, the microwave applications (mostly 2–18 GHz) develop fast in military fields. Consequently, designing and preparing microwave absorbing materials (MAMs) with a lightweight, thin thickness, wide bandwidth, and high * Qiangchun Liu [email protected] Zhenguo Fang [email protected] Shipeng Wang [email protected] Xiangkai Kong [email protected] 1
Key Laboratory for the Precision and Green Synthetic Chemistry and Applications, Ministry of Education, Huaibei Normal University, Huaibei 235000, People’s Republic of China
absorber performance is becoming an urgent challenge to be addressed [4–6]. Ferromagnetic materials possess interesting magnetic and electrical characteristics that have long been subjected to intensive research [7]. Among various types of ferromagnetic MAMS, Fe3O4 is always receiving specific attention due to its strong magnetism, favorable magnetic loss, and low cost [8]. However, the poor electromagnetic impedance match and narrow absorption bandwidth for a pure Fe3O4 nanoparticle with single composition and structure limit its further applications in electromagnetic absorbing fields [9]. In addition, it has been confirmed t
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