Wearable and implantable pressure sensors are in great demand for personalized health monitoring. Pressure sensors with low operation voltage and low power-consumption are desired for energy-saving devices. Organic iontronic devices, such as organic electrochemical transistors (OECTs), have demonstrated great potential for low power-consumption bioelectronic sensing applications. The ability to conduct both electrons and ions, in addition to their low-operation voltage has enabled the widespread use of OECTs in different biosensing fields. However, despite these merits, OECTs have not been demonstrated for pressure sensing applications. This is because most OECTs are gated with aqueous electrolyte, which fails to respond to external pressure. Here, a low power-consumption iontronic pressure sensor is presented based on an OECT, in which an ionic hydrogel is used as a solid gating medium. The resultant iontronic device operated at voltages less than 1 V, with a power-consumption between ~ 101-103 μW, while maintaining a tunable sensitivity between 1 ~ 10 kPa-1. This work places OECTs on the frontline for developing low power-consumption iontronic pressure sensors and for biosensing applications.

中文翻译：

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基于有机电化学晶体管的亚1V、微瓦功耗离子电子压力传感器

可穿戴和植入式压力传感器对个性化健康监测的需求很大。节能设备需要低工作电压和低功耗的压力传感器。有机离子电子器件，例如有机电化学晶体管 (OECT)，已在低功耗生物电子传感应用中展现出巨大的潜力。除了低工作电压外，还可以同时传导电子和离子，这使得 OECT 在不同的生物传感领域得到广泛应用。然而，尽管有这些优点，OECT 还没有被证明用于压力传感应用。这是因为大多数 OECT 都是用水性电解质封闭的，无法对外部压力做出反应。在这里，提出了一种基于 OECT 的低功耗离子电子压力传感器，其中离子水凝胶用作固体门控介质。由此产生的离子电子器件在低于 1 V 的电压下运行，功耗在 ~ 101-103 μW 之间，同时保持在 1 ~ 10 kPa-1 之间的可调灵敏度。这项工作将 OECT 置于开发低功耗离子电子压力传感器和生物传感应用的前沿。