Abstract
MnFe2O4 NPs are successfully decorated on the surface of SiO2 sheets to form the SiO2-MnFe2O4 composite via one-pot hydrothermal synthesis method. The phase identification, morphology, crystal structure, distribution of elements, and microwave absorbing properties in S-band (1.55~3.4 GHz) of the as-prepared composite were investigated by XRD, SEM, TEM, and Vector Network Analyzer (VNA) respectively. Compared with the pure MnFe2O4 NPs, the as-prepared SiO2-MnFe2O4 composite exhibits enhanced microwave absorption performance in this frequency band due to the strong eddy current loss, better impedance matching, excellent attenuation characteristic, and multiple Debye relaxation processes. The maximum reflection loss of −14.87 dB at 2.25 GHz with a broader −10 dB bandwidth over the frequency range of 1.67~2.9 GHz (1.23 GHz) can be obtained at the thickness of 4 mm. Most importantly, the preparation method used here is relatively simple, hence such composite can be served as a potential candidate for effective microwave absorption in S-band.
Highlights
In recent decades, with the rapid development of military and commercial radars and other electronic equipment, the electromagnetic pollution has become one of serious problem following the water, air and noise pollutions [1,2,3,4]
Wang et al [17] synthesized Ag/MnFe2 O4 /RGO and characterized the morphology, microstructure, electromagnetic properties of as-prepared composite, the results displayed that the maximum reflection loss reaches −38 dB at 6 GHz with the thickness of 3.5 mm
S3 samples corresponding to both SiO2 sheets and MnFe2 O4 ferrite can be seen clearly, and no other diffraction peaks corresponding to impurities can be found as well, which indicates that the SiO2 sheets are composited well with the MnFe2 O4 ferrite
Summary
With the rapid development of military and commercial radars and other electronic equipment, the electromagnetic pollution has become one of serious problem following the water, air and noise pollutions [1,2,3,4]. As a kind of magnetic recording materials, the MnFe2 O4 is a common ferrite with spinel structure and has been used in the field of microwave absorption for the past few years [15]. Y. Wang et al [17] synthesized Ag/MnFe2 O4 /RGO and characterized the morphology, microstructure, electromagnetic properties of as-prepared composite, the results displayed that the maximum reflection loss reaches −38 dB at 6 GHz with the thickness of 3.5 mm. The phase identification, morphology, crystal structure, distribution of elements and microwave absorbing properties in S-band of the as-prepared composites were investigated, the samples can obtain enhanced electromagnetic absorption performance in this frequency band compared with pure. It is believed that such composite can be served as a potential candidate of microwave absorber in the frequency range of S-band
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
