Intrinsically conductive and highly stretchable liquid metal/carbon nanotube/elastomer composites for strain sensing and electromagnetic wave absorption

IF 21.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-11-30 DOI:10.1007/s42114-024-01093-0

Haeji Kim, Gangmin Kim, Jae Hyun Kang, Min Ji Oh, Nadeem Qaiser, Byungil Hwang

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Abstract

Wearable strain sensors translate mechanical deformations into electrical signals for healthcare monitoring. However, the limited ductility of conductive metals and polymers to maintain its conductivity under high degree of mechanical deformation is a crucial problem in existing fabrication methods for strain sensors. In this study, an intrinsically conductive and highly stretchable liquid metal (LM)/carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite-based wearable strain sensor with electromagnetic wave (EMW)-absorbing properties was explored. The effect of CNT inclusion in the LM/PDMS composites was investigated, revealing enhanced electrical conductivity and EMW-absorbing characteristics without additional mechanical sintering. Through a comprehensive evaluation considering electrical resistance, stretchability, and EMW-absorbing properties, LM/CNT/PDMS composites with 1.5 wt% CNT were determined to exhibit optimal performance as EMW absorbable strain sensors. The characterization of the electromechanical properties demonstrated the high stretchability and mechanical reliability of the resulting material with a gauge factor of 5.35 within the strain range of 50–100% and a low hysteresis under a stain of 80%, confirming the reliability of the fabricated sensor. The practical performance of the LM/CNT/PDMS composites was analyzed by adhering them to various parts of the body with joints and measuring the changes in their relative resistance, affirming their potential for use in healthcare monitoring devices for point-of-care testing (POCT) that require electromechanical reliability under repeated tensile deformation.

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用于应变传感和电磁波吸收的固有导电和高拉伸液态金属/碳纳米管/弹性体复合材料

可穿戴应变传感器将机械变形转化为电信号，用于医疗监测。然而，导电金属和聚合物在高度机械变形下保持其导电性的有限延展性是现有应变传感器制造方法中的一个关键问题。在本研究中，探索了一种具有固有导电性和高拉伸性的液态金属(LM)/碳纳米管(CNT)/聚二甲基硅氧烷（PDMS）复合材料的具有电磁波吸收性能的可穿戴应变传感器。研究了碳纳米管在LM/PDMS复合材料中的作用，揭示了增强的导电性和emw吸收特性，而无需额外的机械烧结。通过综合考虑电阻、拉伸性和EMW吸收性能的评估，确定含有1.5 wt% CNT的LM/CNT/PDMS复合材料作为EMW吸收应变传感器具有最佳性能。机电性能表征表明，该材料具有较高的拉伸性能和机械可靠性，在50-100%的应变范围内，测量系数为5.35，在80%的应变范围内具有较低的磁滞，证实了该传感器的可靠性。通过用关节将LM/CNT/PDMS复合材料粘附到身体的各个部位并测量其相对电阻的变化，分析了LM/CNT/PDMS复合材料的实际性能，确认了它们在医疗保健监测设备（POCT）中的潜力，这些设备需要在重复拉伸变形下的机电可靠性。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.