Development of lightweight polypyrrole/cellulose aerogel composite with adjustable dielectric properties for controllabl
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ORIGINAL RESEARCH
Development of lightweight polypyrrole/cellulose aerogel composite with adjustable dielectric properties for controllable microwave absorption performance Shuo Feng . Jiacheng Deng . Lujun Yu . Yubing Dong . Yaofeng Zhu . Yaqin Fu
Received: 30 June 2020 / Accepted: 27 September 2020 Ó Springer Nature B.V. 2020
Abstract Lightweight polypyrrole/cellulose aerogel (PPy/CA) composite with three-dimensional (3D) conductive network was synthesized via in-situ polymerization and freeze-drying techniques. The PPy/CA composite shows good elasticity and compressibility owing to the three-dimensional (3D) porous structure. The microwave absorption properties of the PPy/CA composite were measured by wave guide methods. The results show that the complex permittivity of the PPy/CA composite can be effectively modulated through adjusting the compression ratios from 0 to 65%. The PPy/CA composite exhibits optimal microwave absorption performance at the compression ratio
of 65%, which the minimum reflection loss (RL) value reaches - 12.24 dB at 8.53 GHz with the thickness of 5 mm. Besides, the effective bandwidth (RL less than -10 dB) of the PPy/CA composite can cover the whole X-band (8.2–12.4 GHz) by changing the thickness in the range of 4–5 mm. The controllable microwave absorption performance, green, lightweight and well microwave absorption may make it to be a promising microwave absorber in the future. Our research opens a new way to design microwave absorbers by a simple mechanical compression.
Shuo Feng and Jiacheng Deng have contributed equally to this work. S. Feng J. Deng L. Yu Y. Dong Y. Zhu (&) Y. Fu School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Cellulose Aerogel Microwave absorption Compressible Controllable
Introduction With the rapid development of communication technology and the full application of electrical devices, the electromagnetic (EM) radiation pollution is becoming more and more dangerous. Electromagnetic absorbing (EMA) materials, which can convert electromagnetic energy into thermal or other forms of energy, are crucial to deal with the threat of electromagnetic radiation pollution to the ecological environment, human health, and information security (Tong et al. 2018; Li et al. 2019; Liu et al. 2019). However, the traditional EMA materials suffer from high density, poor stability, and easy corrosion, which leads to hinder their practical application (Zhang et al. 2015). To satisfy the ever-growing demand, it is vitally significant to develop high-performance EMA materials with lightweight, broadband, strong absorption, tunable microwave absorption capabilities, and environment-friendly (Fang et al. 2016; Lv et al. 2016; Chen et al. 2019). Aerogels possess three-dimensional (3D) porous structure, ultra-low density, high porosity, and large specific surface area (Huang et al. 2015; Xie
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