Enhancing microwave absorption by constructing core/shell TiN@TiO2 heterostructures through post-oxidation annealing

被引：33
作者：
Liu, Shiduo [1 ]
Meng, Xianwei [1 ]
Wang, Zezhong [1 ]
Li, Zhihong [1 ]
Yang, Kun [1 ]
机构：
[1] Sichuan Engn Tech Coll, Dept Mat Engn, Deyang 618000, Peoples R China
来源：
MATERIALS LETTERS | 2019年 / 257卷
关键词：
Microwave absorption; TiN@TiO2; Core/shell nanocomposites; Heterogeneous interfaces; TIO2; MICROSPHERES; FABRICATION;
D O I：
10.1016/j.matlet.2019.126677
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microwave absorption of the dieletric loss materials could be regulated by compositing other compositions and constructing special structures. Herein, TiN@TiO2 nanocomposites with a controllable core/shell heterostructures were successfully synthesized via a facile 2-step process: firstly preparing the precursor TiN nanoparticles by an arc-discharge method and then annealing them to produce TiN@TiO2 in air condition. The nanocomposites' absorption performances can be effectively tunable by optimizing the oxidation time. Our experimental results shows that the minimum reflection loss value of TiN@TiO2 nanocomposites can achieve -35.9 dB at 10.4 GHz with an absorber thickness of 2.0 mm and effective absorption bandwidth (RL < -10 dB) also reach to 3.1 GHz with a single thickness of 3.0 mm. Compared with that of TiN nanoparticles, the enhanced microwave absorption of TiN@TiO2 mainly originates from the optimized impedance matching as well as the introduction of plenty of heterogeneous interfaces do favor the multiple reflection and absorption of electromagnetic waves. This work is significantly for designing the stable ceramics/oxide heterostructures for microwave absorption. (C) 2019 Elsevier B.V. All rights reserved.
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