Self-Powered Strain Sensing via Ion Physisorption at PVC Ion Gel─Metal Interfaces

IF 8.2 1区化学 Q1 CHEMISTRY, ANALYTICAL

ACS Sensors Pub Date : 2025-05-28 DOI:10.1021/acssensors.5c00632

Dokyun Kim, Chang-Soo Han

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Abstract

Self-powered strain sensors are crucial for wearable technology and low-power applications, where continuous operation with minimal energy is essential. Conventional sensors typically require external power, leading to bulky designs, limited battery life, and frequent maintenance, which hinder seamless integration into wearable devices. This study introduces an ion physisorption-based self-powered strain sensor (IPSS) enabling stable, strain-induced voltage measurements without external power. The IPSS leverages the physical adsorption of [EMIM] cations in a PVC ion gel onto electrode surfaces, generating a measurable voltage difference under strain. Potential of zero charge measurements confirmed selective ion adsorption based on electrode work functions, validating the IPSS’s operating mechanism. Notably, the IPSS demonstrated a broad operational range of 0–200% strain with a linear response of 2.3 mV/% in the low-strain range (0–40%), highlighting its precision for wearable applications. Using the IPSS’s stable, self-powered signal, a CNN-based gesture recognition model achieved 92% accuracy with just 0.00507 GFLOPs, showing the sensor’s potential for low-power, high-accuracy applications in wearable and resource-limited environments.

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聚氯乙烯离子凝胶-金属界面上离子物理吸附的自供电应变传感

自供电应变传感器对于可穿戴技术和低功耗应用至关重要，在这些应用中，以最小的能量连续运行是必不可少的。传统传感器通常需要外部电源，导致设计笨重，电池寿命有限，维护频繁，阻碍了与可穿戴设备的无缝集成。本研究介绍了一种基于离子物理吸附的自供电应变传感器（IPSS），无需外部电源即可实现稳定的应变感应电压测量。IPSS利用PVC离子凝胶中的[EMIM]阳离子在电极表面的物理吸附，在应变下产生可测量的电压差。零电荷电位测量证实了基于电极功函数的选择性离子吸附，验证了IPSS的工作机制。值得注意的是，IPSS显示了0-200%应变的宽工作范围，在低应变范围（0-40%）的线性响应为2.3 mV/%，突出了其可穿戴应用的精度。利用IPSS稳定的自供电信号，基于cnn的手势识别模型仅以0.00507 GFLOPs的速度实现了92%的准确率，显示了该传感器在可穿戴和资源有限的环境中低功耗、高精度应用的潜力。

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来源期刊

ACS Sensors Chemical Engineering-Bioengineering

CiteScore

14.50

自引率

3.40%

发文量

372

期刊介绍： ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.