微波食品加热
材料科学
反射损耗
吸收(声学)
Ku波段
磁矩
钛
电子
蚀刻(微加工)
吸收带
电介质
凝聚态物理
光电子学
纳米技术
光学
复合数
物理
复合材料
量子力学
冶金
图层(电子)
作者
Weimin Xu,Shibo Li,Ying Wu,Weiwei Zhang,Wenbo Yu,Yang Zhou,Shukai Fan,Guoping Bei,Sunan Ding
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-10-21
卷期号:5 (11): 17133-17141
被引量:4
标识
DOI:10.1021/acsanm.2c04062
摘要
New types of microwave absorption (MA) materials are urgently demanded in military radars and communication satellites working in the frequency of 8–12 GHz (X band) and 12–18 GHz (Ku band). However, it remains a challenge to make a material completely satisfy the MA requirements in the whole frequency bands. Here, two-dimensional (2D) Ti3CNTx nanolayered flakes were produced by HF etching of the Ti3AlCN precursor and exhibited an attractive MA performance in the X and Ku bands. The minimum reflection loss (RL) of Ti3CNTx was −41.36 dB at 11.76 GHz with a sample thickness of 1.94 mm. Meanwhile, an effective absorption band (EAB) of 4.24 GHz (in the frequency range 13.76–18 GHz) was achieved when the sample thickness was 1.5 mm. Spin-polarized density functional theory calculations confirmed that Ti3CNTx possesses magnetic moments. The magnetic moments mainly originate from the severe asymmetric spin of electrons of Ti atoms located between N and functional groups induced by the unpaired electrons of N atoms. The synergetic effects of dielectric loss and magnetic loss mechanisms contribute to the MA performance of Ti3CNTx. 2D nanosheets of Ti3CNTx are a promising candidate for MA applications.
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