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Introducing Rich Heterojunction Surfaces to Enhance the High-Frequency Electromagnetic Attenuation Response of Flexible Fiber-Based Wearable Absorbers

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Abstract

With the rapid development of 5G communication and artificial intelligence (AI) technology, electromagnetic radiation pollution is emerging as a serious issue. Achieving both uniform dispersion and controllable loading of absorbers and obtaining functional wearable absorbers with high electromagnetic response are still considered great challenges. In this work, a flexible fiber-based absorber (VFT2h/MF/PPy) with a rich interfacial polarization relaxation was obtained by integrating heterostructures and performing nanostructure design and introducing π-conjugated polymer components. Electrons migrated and redistributed between nanoparticles and nitrogen-carbon lattices with different electrostatic states. The formed heterogeneous interface promoted the electromagnetic attenuation response in the high-frequency region. More specifically, the effective absorption frequency bandwidth was up to 5.6 GHz (corresponds to the Ku-band with a matching thickness range up to 2.55–4.85 mm). Impressively, the abundant modification sites on the fiber surface adjusted the content and dispersion of the magnetic nanoparticles and enhanced the vector superposition effect generated by the structural distribution of the magnetic/electric fields. The introduction of dielectric components improved the interfacial polarization strength of the heterojunction surface and the synergistic effect of the dipolar polarization. The high-efficiency electromagnetic attenuation performance was attributed to multiple loss mechanisms. Our work provides a reference path for the microscopic regulation of the high-efficiency electromagnetic response mechanism of fiber-based flexible absorbing materials.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (2023YFE0108300), the Natural Science Foundation of Jiangsu Province (BK20221336), Jiangsu Agricultural Science and Technology Independent Innovation Fund (CX (23)3060), Fujian Province Science and Technology Plan Project (2022N3013), Jiangxi Forestry Bureau Forestry Science and Technology Innovation Special Project (No. 202240).

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Authors and Affiliations

  1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, People’s Republic of China

    He Han, Zhichao Lou, Qiuyi Wang & Yanjun Li

  2. Key Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, People’s Republic of China

    Zhichao Lou & Lei Xu

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  1. He Han
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Correspondence to Zhichao Lou or Lei Xu.

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Han, H., Lou, Z., Wang, Q. et al. Introducing Rich Heterojunction Surfaces to Enhance the High-Frequency Electromagnetic Attenuation Response of Flexible Fiber-Based Wearable Absorbers. Adv. Fiber Mater. (2024). https://doi.org/10.1007/s42765-024-00387-8

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