A Review on Soft Ionic Touch Point Sensors

초록

A touch sensor is an essential component in meeting the growing demand for human-machine interfaces. These sensors have been developed in wearable, attachable, and even implantable forms to acquire a wide range of information from humans. To be applied to the human body, sensors are required to be biocompatible and not restrict the natural movement of the body. Ionic materials are a promising candidate for soft touch sensors due to their outstanding properties, which include high stretchability, transparency, ionic conductivity, and biocompatibility. Here, this review discusses the unique features of soft ionic touch point sensors, focusing on the ionic material and its key role in the sensor. The touch sensing mechanisms include piezocapacitive, piezoresistive, surface capacitive, piezoelectric, and triboelectric and triboresistive sensing. This review analyzes the implementation hurdles and future research directions of the soft ionic touch sensors for their transformative potential. This paper introduces the increasing importance of touch sensors in human-machine interfaces and the role of soft ionic materials in enhancing the functionality of touch sensors. It provides detailed explanations of various touch sensor mechanisms, including piezocapacitive, piezoresistive, surface capacitive, piezoelectric, triboelectric, and triboresistive. It also discusses the challenges of minimizing humidity sensitivity, improving resilience, and suppressing unwanted electrochemical reactions, along with future directions for touch sensors. image

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