Introduction of dielectric phthalocyanine copper into nano-structure Fe₃O₄ for excellent microwave absorption

Phthalocyanine copper/magnetite (CuPc/Fe₃O₄) magnetic nanohybrids were synthesized from CuPc and FeCl₃·6H₂O via a facile solvent-thermal route. The nanohybrids were monodispersed solid nanospheres and the diameter can be adjusted by polymerization degree of CuPc. Importantly, the as-prepared CuPc/Fe₃O₄ nanohybrids showed excellent microwave absorption properties due to the introduction of dielectric CuPc. A reflection loss ≤−5 dB from 10.0 GHz to 18.0 GHz with multi-frequency microwave absorption was exhibited, and the maximum reflection loss reached to −32.96 dB at 14.50 GHz. Furthermore, the microwave absorption property can be tuned easily by varying polymerization degree of CuPc and the layer thickness of the samples, respectively. Thus, these results offered a promising strategy for the fabrication of absorbents for thin-thickness and strong-absorption microwave absorbing materials with working frequencies adjustable over a wide range. - Highlights: • The diameter can be adjusted by varying polymerization degree of CuPc. • CuPc/Fe₃O₄ exhibits a reflection loss ≤−5 dB from 10.0 to 18.0 GHz. • The nanohybrids exhibit multi-frequency microwave absorption from 10.0 to 18.0 GHz. • The maximum reflection loss reaches to −32.96 dB at 14.50 GHz. • The microwave absorption can be tuned by varying polymerization degree of CuPc