Synthesis and microwave absorbing properties of gamma-Fe2O3-SiO2-poly (3,4-ethylenedioxythiophene) core-shell-shell nanocomposites

摘要

The three-layer core-shell-shell gamma-Fe2O3-SiO2-poly (3,4-ethylenedioxythiophene) (PEDOT) nanocomposite has been successfully synthesized by a facile chemical process followed by a detailed investigation of morphology, composition, electromagnetic, and microwave absorption properties. The electrical conductivity of gamma-Fe2O3-SiO2-PEDOT nanocomposites was as high as 3.34 S cm(-1), and the saturation magnetization was in the range of 1-7 emu g(-1). The minimum reflection loss reached -27.5 dB at 13.8 GHz with a matching layer thickness of 2.0 mm and an effective absorption bandwidth (<-10 dB) of about 4.1 GHz (12.0-16.1 GHz). The excellent microwave absorbing performance of this nanocomposite is due to proper impedance matching and the synergistic interaction of dielectric loss, the magnetic loss, and core-shell microstructure. Moreover, the electromagnetic and microwave absorbing properties of gamma-Fe2O3-SiO2-PEDOT nanocomposites can be regulated by changing the dosage of functionalized gamma-Fe2O3-SiO2.