A flexible sandwich-structured composite film for EMI shielding, thermal management, stress sensing and flame retardancy in wearable electronics

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-03-22 DOI:10.1016/j.coco.2025.102375

Lin Yang , Changgeng Li , Tongle Pu , Yunjun Ruan , Tong Guo

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引用次数: 0

Abstract

The increasing demand for wearable electronics necessitates multifunctional composite films with capabilities such as electromagnetic interference (EMI) shielding, thermal management, and stress sensing. Herein, a flexible multifunctional composite film (PMF) with a sandwich structure was fabricated using a simple vacuum filtration. The multifunctionality and balance of the PMF film are primarily derived from the middle layer of its sandwich structure, which is composed of a blend of MXene, phase change materials, and cellulose nanofibers. This unique composition imparts excellent electrical conductivity, thermal conductivity, heat storage capacity, and mechanical properties to the composite film. Consequently, the PMF film exhibits superior mechanical performance (tensile strength: 20.3 MPa, elongation: 22.5 %), EMI shielding (34.8 dB and 7356.93 dB cm² g⁻¹), and efficient thermal management under light exposure (ΔT: 16 °C–43 °C within 95 s). The polyvinyl alcohol outer layers of the sandwich structure offer a flexible substrate and protect MXene from oxidation. Additionally, the PMF film functions as a stress sensor, capable of monitoring wrist flexion, finger bending, and vocal cord vibrations, while also offering flame retardancy. In conclusion, this meticulously engineered PMF film has significant potential for applications in wearable electronics, because of the combination of EMI shielding, thermal management, stress sensing, and flame resistance.

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一种柔性三明治结构复合薄膜，用于可穿戴电子产品的电磁干扰屏蔽、热管理、应力传感和阻燃

对可穿戴电子产品日益增长的需求需要具有电磁干扰（EMI）屏蔽、热管理和应力传感等功能的多功能复合薄膜。本文采用简单的真空过滤法制备了具有夹层结构的柔性多功能复合薄膜。PMF薄膜的多功能性和平衡性主要来源于其夹层结构的中间层，该夹层结构由MXene、相变材料和纤维素纳米纤维混合而成。这种独特的成分赋予复合膜优异的导电性、导热性、储热能力和机械性能。因此，PMF薄膜具有优异的机械性能（抗拉强度：20.3 MPa，伸长率：22.5%），EMI屏蔽（34.8 dB和7356.93 dB cm2 g−1），以及在光照下有效的热管理（ΔT: 16°C - 43°C, 95 s）。夹层结构的聚乙烯醇外层提供了柔性衬里，并保护MXene免受氧化。此外，PMF薄膜还可以用作压力传感器，能够监测手腕弯曲、手指弯曲和声带振动，同时还具有阻燃性。总之，这种精心设计的PMF薄膜在可穿戴电子产品中具有巨大的应用潜力，因为它结合了EMI屏蔽、热管理、应力传感和阻燃性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.