Nano

SKKU Advanced Institute of Nano Technology (성균관대학교 성균나노과학기술원)
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Preparation and Microwave Absorption Properties of the Fe/TiO2/Al2O3 Composites

  • Li, Yun (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology) ;
  • Cheng, Haifeng (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology) ;
  • Wang, Nannan (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology) ;
  • Zhou, Shen (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology) ;
  • Xie, Dongjin (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology) ;
  • Li, Tingting (Science and Technology on Advanced Ceramic Fibers and Composites Key Lab National University of Defense Technology)
  • Received : 2018.09.02
  • Accepted : 2018.09.28
  • Published : 2018.11.30
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Abstract

To reduce the imbalance of impedance matching between the magnetic metal nanowires and free space, $Fe/TiO_2$ core/shell nanowire arrays with different diameters were fabricated in the templates of anodic aluminum oxide membranes by electrodeposition. The influences of the microstructure on the microwave absorption properties of the $Fe/TiO_2/Al_2O_3$ composites were studied by the transmission/reflection waveguide method. It was demonstrated experimentally that both the interfacial polarization and the diameter of the $Fe/TiO_2$ core/shell nanowires have critical effects on the microwave absorption properties. We also investigated the angle dependence of the microwave absorption properties. Due to the interfacial polarization and associated relaxation, the $Fe/TiO_2/Al_2O_3$ composites exhibited optimal microwave absorption properties when microwave propagation direction was accordant with the axis of the nanowires. Finally, we managed to obtain an optimal reflection loss of below -10 dB (90% absorption) over 10.2-14.8 GHz, with a thickness of 3.0 mm and the minimum value of -39.4 dB at 11.7 GHz.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, National University of Defense Technology

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