Ultrasound-assisted synthesis of multilayer Ag@PDA/cellulose nanofibers conductive films with superior EMI shielding and energy storage applications

IF 5.1 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2025-05-03 DOI:10.1016/j.reactfunctpolym.2025.106317

Jagdeep Singh , A.S. Dhaliwal

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Abstract

In this study, cellulose nanofibers (CNFs) derived from sugarcane bagasse have been modified with polydopamine (PDA) and subsequently decorated with multilayers of silver nanowires (AgNWs) and nanoparticles (AgNPs) using ultrasound-assisted techniques to fabricate lightweight, flexible conductive films. A wide range of analytical methods was used to study the films' optical, chemical, structural, electrical, mechanical properties, and surface morphology, revealing that the films exhibit desired energy storage and electromagnetic interference (EMI) shielding characteristics. The synthesized AgNWs@PDA/CNFs and AgNPs@PDA/CNFs films showed remarkable total EMI shielding effectiveness of approximately 82.5 and 61 dB, respectively, in the X-band (8–12 GHz) frequency range. In addition, the electrochemical studies showed that the AgNWs@PDA/CNFs and AgNPs@PDA/CNFs have specific capacitance values of 1038 F/g and 711 F/g, respectively, as well as energy densities of 113.74 Wh/kg and 89.12 Wh/kg. After 10,000 cycles, the AgNWs@PDA/CNFs had an excellent capacitance retention of 92 %, and the AgNPs@PDA/CNFs had an excellent retention rate of 90 %. The exceptional efficiency of synthetic films in electromagnetic interference (EMI) shielding and energy storage is due to their one-of-a-kind porous continuous nanostructure, which also causes joule heating, numerous reflections, high electrical conductivity, and enhanced ion transport. These conductive, flexible films are ideal for enhanced electromagnetic interference (EMI) shielding and energy storage due to the synergistic features of AgNWs and AgNPs with PDA/CNFs substrate.

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超声辅助合成多层Ag@PDA/纤维素纳米纤维导电膜，具有优异的电磁干扰屏蔽和储能应用

在这项研究中，从蔗渣中提取的纤维素纳米纤维（CNFs）用聚多巴胺（PDA）修饰，随后用多层银纳米线（AgNWs）和纳米颗粒（AgNPs）装饰，利用超声辅助技术制造轻质柔韧的导电薄膜。广泛的分析方法被用于研究薄膜的光学、化学、结构、电学、机械性能和表面形貌，揭示了薄膜具有理想的能量存储和电磁干扰（EMI）屏蔽特性。合成的AgNWs@PDA/CNFs和AgNPs@PDA/CNFs薄膜在x波段（8-12 GHz）频率范围内显示出显著的电磁干扰屏蔽效能，分别约为82.5和61 dB。此外，电化学研究表明AgNWs@PDA/CNFs和AgNPs@PDA/CNFs的比电容值分别为1038 F/g和711 F/g，能量密度分别为113.74 Wh/kg和89.12 Wh/kg。1万次循环后，AgNWs@PDA/CNFs的电容保持率为92%，AgNPs@PDA/CNFs的电容保持率为90%。合成薄膜在电磁干扰（EMI）屏蔽和能量存储方面的卓越效率是由于其独一无二的多孔连续纳米结构，这也导致焦耳加热，多次反射，高导电性和增强的离子传输。由于AgNWs和AgNPs与PDA/CNFs衬底的协同特性，这些导电的柔性薄膜是增强电磁干扰（EMI）屏蔽和能量存储的理想选择。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.