Solvothermal fabrication and growth behavior study of spherical MnFe2O4 through a bottom-up method on wood substrate with effective microwave absorption

Spherical MnFe2O4 colloidal nanocrystal assemblies (CNAs) with different sizes were controllably fabricated on a wood substrate using a solvothermal method through a bottom-up pathway. The sizes of the spherical MnFe2O4, which ranged from 50 nm to 360 nm, could be simply adjusted by a synthetic reagent in the MnFe2O4 CNAs solution composed of primary crystalline with sizes of 12.7-32.4 nm. By studying the fabrication and growth behaviors of spherical MnFe2O4 during the solvothermal reaction, the MnFe2O4/wood composite was successfully synthesized with effective microwave absorption property. Moreover, the as-prepared MnFe2O4/wood hybrids exhibited an effective microwave absorption bandwidth and the minimum reflection loss of composite reached -12 dB at 15.52 GHz.