聚吡咯
电磁屏蔽
电磁干扰
纤维素
纳米纤维
材料科学
反射损耗
吸收(声学)
微波食品加热
导电聚合物
复合材料
导电体
电磁辐射
衰减
纳米技术
光电子学
复合数
光学
化学工程
计算机科学
电信
聚合物
工程类
聚合
物理
作者
Deepu A. Gopakumar,Avinash R. Pai,Yasir Beeran Pottathara,Daniel Pasquini,Luís Carlos de Morais,H. P. S. Abdul Khalil,Ange Nzihou,Sabu Thomas
摘要
Abstract An array of highly conductive, lightweight and flexible cellulose nanopapers as effective attenuators of electromagnetic radiations within 8.2–12.4 GHz (X band) were formulated via in situ polymerization of pyrrole monomers on to cellulose nanofibers (CNFs). It is quite obvious that the free hydroxyl groups on the surface of CNFs facilitate the formation of intense intermolecular hydrogen bonding with PPy which is envisaged for its excellent electromagnetic shielding performance with an average shielding effectiveness of ca. –22 dB (>99% attenuation) at 8.2 GHz for a paper having 1 mm thickness. The fabricated papers displayed a predominant absorption mechanism (ca. 89%) rather than reflection (ca. 11%) for efficiently attenuating electromagnetic radiations, which has a considerable importance in the modern telecommunication sector. Thus, the designed PPy/CNF papers would replace the conventional metal‐based shields and pave way for the development of green microwave attenuators functioning via a strong absorption mechanism. The PPy/CNF nanopapers exhibited a DC conductivity of 0.21 S/cm, a prime requisite for the development of highly efficient electromagnetic shields. Undoubtedly, such nanopapers can be employed in wide range of applications such as electrodes for supercapacitors and other freestanding flexible paper‐based devices.
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