Abstract
Porous rugby-shaped CoFe2O4 particles were synthesized using a vapor diffusion method in combination with calcination. The morphologies and structures of the as-prepared CoFe2O4 particles were characterized by field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, and N2 adsorption–desorption measurement. Results showed that uniform CoFe2O4 rugbies were about 1.1 μm in length and 500 nm in width at the widest point. Rugby-shaped CoFe2O4 nanoparticles were assembled by the layers of nanoparticles and exhibit porous structures. The magnetic and electromagnetic parameters were measured using a vibrating sample magnetometer and a vector network analyzer, respectively. The obtained rugby-shaped products exhibited a saturation magnetization of 73.4 emu g−1 and a coercivity of 2218.7 Oe at room temperature. A minimum reflection loss of −34.1 dB was observed at 13.4 GHz for the sample with a thickness of 2.5 mm, and the effective absorption frequency (RL < −10 dB) ranged from 12.3 to 14.9 GHz, indicating the excellent microwave absorption performance of the novel products. The absorbing performance of the CoFe2O4 rugbies was better than that of the CoFe2O4 nanoparticles.
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