title: Lightweight NiFe2O4with controllable 3D network structure and enhanced microwave absorbing properties.
abstract: 3D network structure NiFe2O4was successfully synthesized by a templated salt precipitation method using PMMA colloid crystal as templates. The morphology, phase composition and microwave absorbing properties of as-prepared samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), vector network analyzer (VNA), and so on. The results revealed that the 3D network structure was configurated with smooth spherical walls composed of NiFe2O4nanocrystals and their pore diameters being in the range of 80-250 nm. The microwave absorption properties of the 3D network structure NiFe2O4were crucially determined by the special structure. The synergy of intrinsic magnetic loss of magnetic NiFe2O4and the interfacial polarization enhanced by 3D network structure and the interaction of multiple mechanisms endowed the sample with the feature of strong absorption, broad bandwidth and lightweight. There is more than one valley in the reflection loss curves and the maximum reflection loss is 27.5 dB with a bandwidth of 4 GHz. Moreover, the 3D network structure NiFe2O4show a greater reflection loss with the same thickness comparing to the ordinary NiFe2O4nanoparticles, which could achieve the feature of lightweight of the microwave absorbing materials.
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Fen
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Xing
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Zhu
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Yang
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Xingang
authors.initials: X
authors.lastname: Kong
authors.affiliation: School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, PR China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu