Tactile sensors with multifunctional sensing characteristics enhance people’s perception of external stimuli and have become an indispensable part of human–computer interaction. However, constructing a multi-functional tactile sensor that is able to respond to multiple stimuli without signal crosstalk still remains challenging. Here, we proposed a temperature–pressure integrated multi-functional tactile sensor (TP-MTS) by coupling thermoresistive and contact-electrification effects, which can simultaneously detect human body temperature and physiological motion. A sensing electrode model was validated by using a PVDF/PEG/Gr (polyvinylidene difluoride/Polyethylene terephthalate/graphene) composite thermoresistive film instead of the traditional metal as the electrode of the pressure sensing unit. The multi-functional tactile sensor converts temperature and pressure stimuli into two independent output signals from different paths, realizing simultaneous detection of temperature and pressure without signal crosstalk. The TP-MTS can achieve real-time temperature monitoring with a minimum resolution of 0.1℃ and a sensitivity of 1.51 % ℃-1 and it could also detect pressure in a wide pressure range (0.25 kPa ∼ 253.87 kPa) with the sensitivity of 3.73 kPa−1. Through the structure design and the huge impedance difference between the thermosensitive film and the triboelectric unit, the real-time monitoring of temperature and pulse is realized simultaneously in a single device without crosstalk.

中文翻译：

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无串扰多功能触觉传感器，用于精确的生理监测


具有多功能传感特性的触觉传感器增强了人们对外界刺激的感知，已成为人机交互中不可或缺的一部分。然而，构建一个能够在没有信号串扰的情况下响应多种刺激的多功能触觉传感器仍然具有挑战性。在这里，我们提出了一种通过耦合热阻和接触电气效应的温度-压力一体化多功能触觉传感器 （TP-MTS），它可以同时检测人体温度和生理运动。通过使用 PVDF/PEG/Gr（聚偏二氟乙烯/聚对苯二甲酸乙二醇酯/石墨烯）复合热阻膜代替传统金属作为压力传感单元的电极，验证了传感电极模型。多功能触觉传感器将温度和压力刺激转换为来自不同路径的两个独立输出信号，实现温度和压力的同时检测，无信号串扰。TP-MTS 可以实现实时温度监测，最小分辨率为 0.1°C，灵敏度为 1.51 % °C-1，还可以在较宽的压力范围 （0.25 kPa ∼ 253.87 kPa） 内检测压力，灵敏度为 3.73 kPa-1。通过结构设计和热敏膜与摩擦电单元之间的巨大阻抗差，在单个器件中同时实现温度和脉冲的实时监测，无串扰。