Robust Flexible Pressure Sensors Made from Conductive Micropyramids for Manipulation Tasks.,ACS Nano

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Robust Flexible Pressure Sensors Made from Conductive Micropyramids for Manipulation Tasks.
ACS Nano ( IF 15.8 ) Pub Date : 2020-09-17 , DOI: 10.1021/acsnano.0c03659
Chao Ma _{1,

2} , Dong Xu ₁ , Yun-Chiao Huang ₁ , Peiqi Wang ₃ , Jin Huang ₁ , Jingyuan Zhou ₃ , Wenfeng Liu ₂ , Sheng-Tao Li ₂ , Yu Huang _{1,

4} , Xiangfeng Duan _{3,

4}

Affiliation

Flexible pressure sensors that can robustly mimic the function of slow-adapting type I (SA-I) mechanoreceptors are essential for realizing human-like object manipulation in artificial intelligent (AI) robots or amputees. Here, we report a straightforward approach to highly sensitive and robust flexible pressure sensors with fast response time and low operating voltage based on conductive micropyramids made of polydimethylsiloxane/carbon nanotube composites. Both numerical simulations and experimental studies show that the pressure-sensing properties of the devices can be systematically tuned by the spatial arrangement of micropyramids. In particular, by tailoring the ratio between the spacing and the pyramidal base length, the optimal pressure sensors can be achieved with a combination of high sensitivity in both low-pressure (<10 kPa) and medium-pressure (10–100 kPa) regimes, rapid response, high mechanical robustness, low operating voltage, and low power consumption, along with linear response and low hysteresis in the medium-pressure regimes. The optimized pressure sensor is further used for constructing a wearable pressure-sensing system that can convert the amplitude of pressure to wirelessly transmittable frequency signals (spikes) with nearly linear response, closely mimicking SA-I mechanoreceptors. Furthermore, we demonstrate that the high uniformity and scalability of the pressure sensors enable large-area pressure-sensing arrays for spatially resolved pressure mapping.

中文翻译：

由导电微金字塔制成的坚固，灵活的压力传感器，可用于处理任务。

灵活的压力传感器能够牢固地模仿慢速适应型I（SA-I）机械感受器的功能，对于在人工智能（AI）机器人或截肢者中实现类似人的物体操纵至关重要。在这里，我们报告了一种基于聚二甲基硅氧烷/碳纳米管复合材料制成的导电微金字塔的，具有快速响应时间和低工作电压的高灵敏度，坚固耐用的柔性压力传感器的简单方法。数值模拟和实验研究均表明，可通过微金字塔的空间排列来系统地调节设备的压力感应特性。特别是，通过调整间距与金字塔形底边长度之间的比例，可以在低压（< 10 kPa）和中压（10–100 kPa）状态，快速响应，高机械强度，低工作电压和低功耗，以及中压状态下的线性响应和低滞后。优化的压力传感器还用于构建可穿戴的压力传感系统，该系统可以将压力的幅度转换为具有近似线性响应的无线可传输频率信号（峰值），与SA-1机械感受器极为相似。此外，我们证明了压力传感器的高度均匀性和可扩展性使大面积压力传感阵列可用于空间分辨的压力映射。在中压状态下具有线性响应和低滞后性。优化的压力传感器还用于构建可穿戴的压力传感系统，该系统可以将压力的幅度转换为具有近似线性响应的无线可传输频率信号（峰值），与SA-1机械感受器极为相似。此外，我们证明了压力传感器的高度均匀性和可扩展性使大面积压力传感阵列可用于空间分辨的压力映射。在中压状态下具有线性响应和低滞后性。优化的压力传感器还用于构建可穿戴的压力传感系统，该系统可以将压力的幅度转换为具有近似线性响应的无线可传输频率信号（峰值），与SA-1机械感受器极为相似。此外，我们证明了压力传感器的高度均匀性和可扩展性使大面积压力传感阵列可用于空间分辨的压力映射。

更新日期：2020-10-28

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