Issue 14, 2015

Facile preparation and enhanced microwave absorption properties of core–shell composite spheres composited of Ni cores and TiO2 shells

Abstract

Core–shell microspheres with Ni cores and two phases of TiO2 (anatase, rutile) shells have been successfully synthesized. The crystal structure, morphology and microwave absorption properties of the as-prepared composites were analyzed by X-ray diffraction, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and vector network analysis. The core–shell rutile TiO2-coated Ni exhibits better antioxidation ability than that of pure Ni due to the presence of the rutile TiO2 shell, which is confirmed by the thermal gravimetric analysis (TGA). In comparison with bare Ni, these two composites show better microwave absorption properties. The minimum reflection loss (RL) is −38.0 dB at 11.1 GHz with a thickness of only 1.8 mm for the Ni@TiO2 (rutile) composite. The enhanced absorption capability arises from the efficient complementarities between the magnetic loss and dielectric loss, multiple interfacial polarization, high thermal conductivity of rutile TiO2 and microwave attenuation constant. These results show that the thin high-efficiency rutile TiO2-coated Ni composite is a great potential microwave absorbing material for practical applications.

Graphical abstract: Facile preparation and enhanced microwave absorption properties of core–shell composite spheres composited of Ni cores and TiO2 shells

Supplementary files

Article information

Article type
Paper
Submitted
04 Dec 2014
Accepted
25 Feb 2015
First published
25 Feb 2015

Phys. Chem. Chem. Phys., 2015,17, 8802-8810

Author version available

Facile preparation and enhanced microwave absorption properties of core–shell composite spheres composited of Ni cores and TiO2 shells

B. Zhao, G. Shao, B. Fan, W. Zhao, Y. Xie and R. Zhang, Phys. Chem. Chem. Phys., 2015, 17, 8802 DOI: 10.1039/C4CP05632A

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