Skin-Inspired and Self-Powered Piezoionic Sensors for Smart Wearable Applications

IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-01-09 DOI:10.1002/smll.202410594
Xinpeng Yu, Xiaohong Zhang, Chao Lu
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引用次数: 0

Abstract

Bio-inspired by tactile function of human skin, piezoionic skin sensors recognize strain and stress through converting mechanical stimulus into electrical signals based on ion transfer. However, ion transfer inside sensors is significantly restricted by the lack of hierarchical structure of electrode materials, and then impedes practical application. Here, a durable nanocomposite electrode is developed based on carbon nanotubes and graphene, and integrated into piezoionic sensors for smart wearable applications, such as facial expression and exercise posture recognitions. The nanocomposite electrode provides abundant channels for ion transfer because of its hierarchically porous structure. Carbon nanotubes not only prevent restacking of graphene nanolayers, but also connect them across out-plane dimension. The piezoionic skin sensors present a high degree of linearity in a wide strain range with high sensitivity, and long cycling life with bending strains beyond 20 000 s. Further, a smart bracelet based on flexible sensors is fabricated for accurate posture recognition of badminton exercise, valuable to athlete training.

Abstract Image

用于智能可穿戴应用的皮肤启发和自供电压电传感器
压电式皮肤传感器受人体皮肤触觉功能的启发,通过将机械刺激转化为基于离子传递的电信号来识别应变和应力。然而,由于电极材料层次结构的缺乏,传感器内部的离子传递受到很大的限制,从而阻碍了实际应用。在这里,基于碳纳米管和石墨烯开发了一种耐用的纳米复合电极,并将其集成到压电传感器中,用于智能可穿戴应用,如面部表情和运动姿势识别。纳米复合电极的分层多孔结构为离子转移提供了丰富的通道。碳纳米管不仅可以防止石墨烯纳米层的重新堆积,还可以将它们跨平面连接起来。压电表面传感器在宽应变范围内线性度高,灵敏度高,弯曲应变超过20000 s的循环寿命长。此外,制作了基于柔性传感器的智能手环,用于羽毛球运动的准确姿势识别,对运动员训练有价值。
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来源期刊
Small
Small 工程技术-材料科学:综合
CiteScore
17.70
自引率
3.80%
发文量
1830
审稿时长
2.1 months
期刊介绍: Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.
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