Block Building Architecture for a Multifunctional Broadband Electromagnetic Wave Absorber Based on the Freestanding Resistive Film Block Building Architecture for a Multifunctional Broadband Electromagnetic Wave Absorber Based on the Freestanding Resistive Film AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c00742

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As the critical component in the electromagnetic (EM) wave shielding and stealth technology, using broadband EM wave absorbers in harsh environments is still challenging in practical applications. In this letter, a novel way of realizing the broadband absorbers with a block building method is proposed to broaden their absorptivity to different application scenarios. In particular, the synthesis of the self-supported carbon nanotube–cellulose nanocrystal (CNT–CNC) film, which acts as a resistive layer, is independent of selecting substrates during fabrication and assembling. Therefore, replacing the substrates to meet different application requirements is easy. We experimentally demonstrate the application of a block building method in realizing a high temperature-resistant and self-repairing EM wave absorber by combining the CNT–CNC film with ceramics and supramolecular thermoplastic urethane substrates, respectively. Moreover, the CNT–CNC film is compatible with laser etching and further offers a convenient way of tuning the absorption frequency after incorporating frequency-selective surface design. The proposed block building method offers insights into designing multifunctional absorbers.