In recent years, the rapid development of mobile Internet and smart terminals has greatly stimulated the exploration of smart sensor technologies in human-computer interaction, artificial intelligence and wearable devices. In smart devices, a large number of revolutionary functional products such as foldable display screens, flexible integrated circuits, and health monitoring devices have emerged, making people place higher demands on tactile sensors. In particular, the wide range sensitivity, response time, portability, ease of use, and multi-functional integration of the device have become the focus of attention for practical applications of tactile sensors.
Transparent, flexible self-driven touch sensor
Transparent, flexible self-driven touch sensor
At present, touch sensors based on different physical mechanisms have made breakthroughs in device performance. Many products on the market utilize piezoresistive, piezoelectric, and capacitive sensors with high pressure sensitivity to detect pressures of different sizes, but devices based on these materials either rely on external power supplies or are The signal is too small to be susceptible to interference, and it is difficult to directly convert the external stress into an electrical signal that is adequately identified. Therefore, there are certain limitations in use. The increasing number of wearable and portable electronic products in life requires that they not only satisfy complex applications but also adapt to people's use on different occasions, thus providing greater demand for sensor convenience, comfort and fashion elements. .
Under the guidance of Wang Zhonglin and Li Congju of the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, Dr. Yuan Zuqing and other researchers developed a transparent and flexible friction sensor array based on the physical sensing mechanism of friction nanogenerators. Hereinafter referred to as TSA). The device combines high transparency, bendability, and multi-touch operation to achieve biomechanical energy collection, tactile sensing, and intelligent unlocking. This work provides a new perspective for the study of transparent, flexible flexible tactile sensor arrays. Research results are published in the recent ACS nano (DOI: 10.1021/acsnano.7b03680).
The TSA sensing unit designed and prepared by the researchers can generate an open circuit voltage of 50 volts when touched, and can achieve a sensing sensitivity of 2.79 mV/Pa and a response time of about 50 ms in a low pressure area. The device is compact in structure, easy to operate, and has a large-scale manufacturing foundation. It can be integrated in mobile phones, watches and other electronic products. Therefore, TSA has a broad market prospect, in human-computer interaction, self-driven robots, flexible displays and wearable electronics. There is potential application value in the equipment.
(Original title: Transparent and flexible self-driven tactile sensor developed successfully)
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