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首页> 外文期刊>Advanced functional materials >Carbon Nanocoils/Carbon Foam as the Dynamically Frequency-Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth
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Carbon Nanocoils/Carbon Foam as the Dynamically Frequency-Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

机译：Carbon Nanocoils/Carbon Foam as the Dynamically Frequency-Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

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摘要

The absorption frequency of conventional microwave absorbing materials(MAMs) is hardly tuned in operando, while such dynamic frequency regulationof MAMs is of great significance to meet the high demands of modernradars and intelligent electron devices. Here, an ingenious frequency-tuningstrategy by means of the pressure variations is developed by fabricatinghighly compressible carbon nanocoils/carbon foam (CNCs/CF) as a dynamicallyfrequency-tunable microwave absorber. Through adjusting the compressionstrain, the absorption bandwidth of CNCs/CF can be preciselytuned from S-band (2?4 GHz) to Ku-band (12?18 GHz). The adjustableeffective 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 lossof ?64.6 dB. Furthermore, the CNCs/CF also exhibit a good thermal insulation,strong hydrophobicity, and strain-sensitive conductivity, endowingthem with fascinating functions of heat insulation and self-cleaning. Themethod of utilizing an external pressure to dynamically adjust the absorptionfrequencies of CNCs/CF is demonstrated for the first time, which opens anavenue for the applications of dynamically frequency-tunable MAMs with anultrawide adjusting range and absorption bandwidth.

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