材料科学
微波食品加热
介电常数
羰基铁
反射损耗
热稳定性
复合材料
吸收(声学)
复合数
光电子学
电介质
化学工程
量子力学
物理
工程类
作者
Junru Yao,Yongbao Feng,Zhengjun Yao,Li Wan,Jinsen Hou,Zibao Jiao,Wenjun Huyan,Yanru He,Pïng Chen,Jintang Zhou
标识
DOI:10.1002/aelm.202100587
摘要
The exploration for the potential lightweight and high efficiency microwave absorbers with thermal stability is a great challenge for researchers. More importantly, the electromagnetic parameters of absorbers at elevated temperatures are seldom studied. In this work, sandwich MXene-Ti3C2Tx@flake carbonyl iron (MF) composites with tunable and efficient microwave absorption at elevated temperatures are successfully fabricated by an electrostatic self-assembly method. Both the complex permittivity and permeability of the MF are strongly temperature dependent in the temperature range of 298–473 K and X band (8.2–12.4 GHz). The efficient microwave absorption of MF at different temperatures can be achieved by changing the ratio of raw materials. Specifically, at room temperature, reflection loss (RL) ≤−10 dB of MF composite covers the whole X band at 2.12 mm, while the optimum RL value is −26.3 dB at 11.81 GHz. At 373 K, the optimum microwave absorption value of the MF composite reaches up to −63 dB at 10.27 GHz and RL ≤−10 dB can cover a whole X band with a thickness of 1.52 mm. Therefore, MF composites are expected to be promising candidates as ultrathin, highly efficient, and broadband absorbing materials at elevated temperatures.
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