期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 52, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202209898
关键词
carbon nanocoils; dynamic frequency regulation; microwave absorption; ultrawide tuning ranges
类别
资金
- National Natural Science Foundation of China [22278101, 22068010, 22168016]
- Natural Science Foundation of Hainan Province [2019RC142, 519QN176]
- Finance Science and Technology Project of Hainan Province [ZDYF2020009]
A frequency-tuning strategy using pressure variations is developed to achieve dynamic frequency regulation of microwave absorbing materials. The fabricated carbon nanocoils/carbon foam (CNCs/CF) can be tuned from S-band to Ku-band through adjusting compression strain. The method opens up new possibilities for the applications of dynamically frequency-tunable MAMs.
The absorption frequency of conventional microwave absorbing materials (MAMs) is hardly tuned in operando, while such dynamic frequency regulation of MAMs is of great significance to meet the high demands of modern radars and intelligent electron devices. Here, an ingenious frequency-tuning strategy by means of the pressure variations is developed by fabricating highly compressible carbon nanocoils/carbon foam (CNCs/CF) as a dynamically frequency-tunable microwave absorber. Through adjusting the compression strain, the absorption bandwidth of CNCs/CF can be precisely tuned from S-band (2-4 GHz) to Ku-band (12-18 GHz). The adjustable effective absorption bandwidth is as wide as 15.4 GHz, which covers 96% of the entire microwave frequency. Under 10% compression strain, CNCs/CF shows an attractive bandwidth of 9.0 GHz and a strong reflection loss of -64.6 dB. Furthermore, the CNCs/CF also exhibit a good thermal insulation, strong hydrophobicity, and strain-sensitive conductivity, endowing them with fascinating functions of heat insulation and self-cleaning. The method of utilizing an external pressure to dynamically adjust the absorption frequencies of CNCs/CF is demonstrated for the first time, which opens an avenue for the applications of dynamically frequency-tunable MAMs with an ultrawide adjusting range and absorption bandwidth.
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