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Solvothermal synthesis and electromagnetic absorption properties of pyramidal Ni superstructures

Published online by Cambridge University Press:  15 July 2014

Biao Zhao
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China
Gang Shao
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China
Bingbing Fan
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China
Yajun Xie
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China
Binbin Wang
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China
Rui Zhang*
Affiliation:
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China; and Zhengzhou Aeronautical Institute of Industry Management, Zhengzhou, Henan 450046, People's Republic of China
*
a)Address all correspondence to this author. e-mail: zhangray@zzu.edu.cn
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Abstract

The submicrometer Ni cones have been successfully prepared through a simple solvothermal method in glycerol. The as-prepared products were extensively characterized by x-ray diffraction, field emission scanning electron microscopy, energy-dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The effects of the volume ratios of glycerol to water, and the concentration of alkali on morphologies of Ni samples were investigated. The electromagnetic wave absorption properties of Ni cones were evaluated based on the relative complex permeability (μr) and permittivity (εr). A minimum reflection loss (RL) of −41.6 dB was observed at 4.7 GHz with the thickness of 3.8 mm and the RL values below −10 dB were obtained in the range of 3.9–15.0 GHz with the corresponding thickness of 1.8–3.8 mm. The excellent wave absorption properties of the obtained products are due to the synergic effect of dielectric loss and magnetic loss, geometry effect and unique morphology.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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