Time-sensitivity for the preparation and microwave absorption properties of core–shell structured Ni/TiO2 composite microspheres

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Abstract

Core–shell Ni/TiO2 composite microspheres with different crystallinity have been prepared at various reaction times by the solvothermal method. The crystal structure and morphology of the products were investigated by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. The microwave absorption properties of the core–shell Ni/TiO2 composites were investigated at 1.0–18.0 GHz. The results show that the morphology and microwave absorption performances of Ni/TiO2 composites were largely influenced by the crystallinity of TiO2 shells. The crystallinity of anatase TiO2 can be increased with increasing reaction time. Minimum peaks of Ni/TiO2 composites shift to the high frequency with increasing the crystallinity of anatase TiO2, which are due to high thermal conductivity of high crystallinity of TiO2. The Ni/TiO2 prepared at 36 h exhibits the best microwave absorption properties with minimum reflection loss of −16.9 dB at 14.1 GHz.

Keywords

TiO2 Atomic Layer Deposition Microwave Absorption Complex Permittivity Anatase TiO2 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51172213).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina
  2. 2.Zhengzhou Aeronautical Institute of Industry ManagementZhengzhouChina

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