Self-Assembled ZnO/Co Hybrid Nanotubes Prepared by\nElectrospinning for Lightweight and High-Performance Electromagnetic\nWave Absorption

Abstract

In this work, hollow\nZnO/Co hybrid nanotubes are prepared by electrospinning\nfollowed by calcination and hydrogen reduction process for electromagnetic\nwave absorption. The texture and electromagnetic wave absorption performance\nof ZnO/Co hybrid nanotubes with different Co contents are thoroughly\ninvestigated. Among the studied hybrid nanotubes, ZnO/Co hybrid nanotubes\nwith the same molar concentrations exhibit superb electromagnetic\nwave absorbing property. The maximum reflection loss reaches −68.4\ndB at 11.4 GHz with a matching thickness of 3.0 mm and the maximum\neffective absorption (reflection loss ≤ −10 dB) bandwidth\nis up to 5.9 GHz (9.5–15.4 GHz) with a matching thickness of\n2.6 mm. The superior property could be attributed to the favored impedance\nmatching performance and various loss pathways including natural resonance,\ninterfacial polarizations, dipole polarization, and conductive loss.\nThe unique three-dimensional network structure formed by nanotubes\nfurther contributes to the loss performance. The hollow ZnO/Co hybrid\nnanotubes can be utilized as an ideal candidate for lightweight and\nhigh-efficiency electromagnetic wave absorption materials.