A Facile Strategy for Low Young's Modulus PDMS Microbeads Enhanced Flexible Capacitive Pressure Sensors,Particle & Particle Systems Characterization

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A Facile Strategy for Low Young's Modulus PDMS Microbeads Enhanced Flexible Capacitive Pressure Sensors
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2021-05-24 , DOI: 10.1002/ppsc.202100019
Yupeng Sun ₁ , Huiling Tai ₁ , Zhen Yuan ₁ , Zaihua Duan ₁ , Qi Huang ₁ , Yadong Jiang ₁

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Flexible pressure sensors are widely demanded in human care systems. A simple and effective strategy for sensor fabrication can markedly promote its application. Herein, a facile strategy is employed to prepare a flexible capacitive pressure sensor with a polydimethylsiloxane microbeads-modified dielectric layer. Owing to the microbeads structure, the proposed sensor achieves a sensitivity of 0.048 kPa⁻¹ in the range of 0–10 kPa with a wide dynamic range (up to 100 kPa). The sensitivity is nine times higher than that of the planar structure. Moreover, the microbeads structured sensor obtains a low limit of detection (0.2 kPa), fast response time (120 ms), and good stability (variation lower than 3.30% after 1000 loading/unloading cycles at 20 kPa). The finite-elemental analysis reveals that the microbeads structure is critical to enhance the performance of sensors. Finally, the pressure sensor is successfully applied to detect touch signal, joints movement, and breathing, exhibiting its promising prospects as smart wearable devices. Furthermore, the strategy may provide a new idea for the microstructural design of capacitive pressure sensors.

中文翻译：

低杨氏模量 PDMS 微珠增强柔性电容压力传感器的简便策略

人类护理系统广泛需要柔性压力传感器。一种简单有效的传感器制造策略可以显着促进其应用。在此，采用一种简便的策略来制备具有聚二甲基硅氧烷微珠改性介电层的柔性电容压力传感器。由于微珠结构，所提出的传感器实现了 0.048 kPa ^-1的灵敏度在 0–10 kPa 范围内，具有宽动态范围（高达 100 kPa）。灵敏度是平面结构的九倍。此外，微珠结构传感器具有检测下限（0.2 kPa）、响应时间快（120 ms）和良好的稳定性（在20 kPa下1000次加载/卸载循环后变化小于3.30%）。有限元分析表明，微珠结构对于提高传感器的性能至关重要。最后，压力传感器成功应用于检测触摸信号、关节运动和呼吸，显示出其作为智能可穿戴设备的广阔前景。此外，该策略可能为电容式压力传感器的微观结构设计提供新思路。

更新日期：2021-07-19

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