Preparation, Microwave Absorption and Infrared Emissivity of Ni-doped ZnO/Al Powders by Coprecipitation Method in the GHz Range

다국어 초록 (Multilingual Abstract)

In this work, Ni-doped ZnO/Al composites were prepared by a facile chemical co-precipitation method. The morphology and structure of the as-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), respectively. It was found that the flakelike Al powders were successfully coated by Ni-doped ZnO nanoparticles with slight aggregation and Ni2+ was successfully doped into the crystal lattice of ZnO. Moreover, the effects of ZnO concentration and doped Ni concentration on the infrared emissivity of ZnO/Al composites at the waveband range of 8–14 µm were studied. The results showed that the ZnO/Al composites exhibited the lowest infrared emissivity of 0.34 with 50 wt.% ZnO concentration. Meanwhile, the electromagnetic parameters and microwave absorbing properties of Ni-doped ZnO/Al composites in the frequency range of 2–18 GHz were explored. Significantly, 12 mol.% Ni-doped ZnO/Al composites presented the lowest infrared emissivity of 0.37 and the maximum reflection loss reached -32.5 dB at 13.6 GHz with a thickness of 4.5 mm. The excellent microwave absorbing properties could be attributed to the good impedance match, crystal lattice defects and interfacial polarization. It was believed that the Ni-doped ZnO/Al composites could be used as potential infrared-microwave compatible stealth materials.

참고문헌 (Reference)

1 D. Chen, 1 : 5996-, 2013

2 Y. P. Duan, 22 : 18291-, 2012

3 X. Sun, 1 : 765-, 2013

4 M. Zong, 111 : 188-, 2013

5 B. Wen, 26 : 3484-, 2014

6 H. L. Lv, 374 : 225-, 2015

7 L. Yuan, 583 : 492-, 2014

8 X. L. Su, 40 : 5307-, 2014

9 L. Yuan, 580 : 108-, 2013

10 G. W. Wu, 76 : 107-, 2013

11 F. Wu, 2 : 20307-, 2014

12 H. M. Xiong, 130 : 7522-, 2008

13 Y. H. Zheng, 46 : 6675-, 2007

14 X. J. Luo, 38 : 84-, 2014

15 M. M. Lu, 2 : 10540-, 2014

16 G. S. Wang, 2 : 8644-, 2014

17 S. Y. Zhang, 61 : 1-, 2013

18 D. M. Zhu, 255 : 6145-, 2009

19 X. F. Lei, 21 : 209-, 2010

20 W. B. Yue, 17 : 4947-, 2007

21 X. J. Zhang, 6 : 7471-, 2014

22 R. D. Shannon, 32 : 751-, 1976

23 Y. Liu, 604 : 281-, 2014

24 Z. G. Yin, 135 : 430-, 2005

25 J. D. Van Horn, "http://v.web.umkc.edu/vanhornj/shannonradii.htm"