Journal
MOLECULES
Volume 24, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/molecules24142605
Keywords
manganese ferrite; silica; composites; microwave absorption performance; S-band
Funding
- Cultivation Project of Sichuan Science and Technology Innovation Seedling Program
- National Natural Science Foundation of China [51704242]
- Natural Science Foundation of Shaanxi Province in China [2018JM5094]
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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 similar to 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 similar to 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.
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