Abstract
The W-type hexaferrite Ba0.85La0.15Co2Fe16O27 composite with polyaniline was synthesized by a facile route of in-situ chemical oxidative polymerization. This novel organic–inorganic composite material (PANI/Ba0.85La0.15Co2Fe16O27) can be used as a potential microwave absorber. And their microstructure, static magnetization, complex permittivity, permeability and microwave absorbing properties were subsequently investigated. Compared with pure W-type hexagonal ferrite, the composites have higher permittivity and reflection loss, which gradually increase with the increase of PANI content. The excellent microwave absorption in our experiment reached to −14.95 dB at 9.3 GHz with the layer thickness of 4 mm when the mass ratio was 0.7/0.5. More importantly, well reflection loss over a wide frequency range can be achieved by manipulating the content of PANI. The results indicated that the novel organic–inorganic materials composed of polyaniline and W-type hexagonal ferrite had an excellent microwave absorption property, and may be used as lightweight and highly effective microwave absorbers.
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