Recently, multifunctional materials have received widespread attention from researchers. Cellulose nanofibers (CNF) is one of biomass materials with abundant hydroxyl groups, which shows great potential in manufacturing multifunctional composite material. In this paper, a kind of polyaniline@CNF/polyvinyl alcohol-HSO multifunctional composite material (PANI@CNF/PVA-HSO) was successfully designed by chemical polymerization of conductive polyaniline (PANI) onto CNF aerogel with high aspect ratio, and then coated with PVA-HSO gel. The composite material has a specific capacitance of 502.2 F/g at a scan rate of 5 mV/s as supercapacitor electrode. Furthermore, when the composite was assembled into a symmetrical supercapacitor, it can still provide an energy density of 11.49 W h/kg at a high power density of 413.55 W/kg. Besides, the as-obtained PANI@CNF/PVA-HSO composite has an excellent electromagnetic shielding performance of 34.75 dB in X-band. In addition, due to the excellent flexibility of CNF and PVA, the PANI@CNF/PVA-HSO composites can be further applied to stress sensors to detect pressure and human motion signals.

中文翻译：

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聚苯胺@纤维素纳米纤维多功能复合材料用于超级电容器、电磁干扰屏蔽和传感

近年来，多功能材料受到研究者的广泛关注。纤维素纳米纤维（CNF）是一种富含羟基的生物质材料，在制造多功能复合材料方面显示出巨大的潜力。本文通过将导电聚苯胺（PANI）化学聚合到高长径比的CNF气凝胶上，然后涂覆，成功设计出一种聚苯胺@CNF/聚乙烯醇-HSO多功能复合材料（PANI@CNF/PVA-HSO）。与 PVA-HSO 凝胶。该复合材料作为超级电容器电极在5 mV/s扫描速率下比电容为502.2 F/g。此外，当该复合材料组装成对称超级电容器时，仍可在413.55 W/kg的高功率密度下提供11.49 W h/kg的能量密度。此外，所得PANI@CNF/PVA-HSO复合材料在X波段具有34.75 dB的优异电磁屏蔽性能。此外，由于CNF和PVA优异的柔韧性，PANI@CNF/PVA-HSO复合材料可以进一步应用于应力传感器，以检测压力和人体运动信号。