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Flexible Smart Noncontact Control Systems with Ultrasensitive Humidity Sensors

2019-08-29

Authors: Yang, JH; Shi, RL; Lou, Z; Choi, RQ; Jiang, K; Shen, GZ

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Early Access: AUG 2019 Language: English Document type: Article; Early Access

DOI: 10.1002/smll.201902801

Abstract:

The development of noncontact humidity sensors with high sensitivity, rapid response, and a facile fabrication process is urgently desired for advanced noncontact human-machine interaction (HMI) applications. Here, a flexible and transparent humidity sensor based on MoO3 nanosheets is developed with a low-cost and easily manufactured process. The designed humidity sensor exhibits ultrahigh sensitivity, fast response, great stability, and high selectivity, exceeding the state-of-the-art humidity sensors. Furthermore, a wearable moisture analysis system is assembled for real-time monitoring of ambient humidity and human breathing states. Benefiting from the sensitive and rapid response to fingertip humidity, the sensors are successfully applied to both a smart noncontact multistage switch and a novel flexible transparent noncontact screen for smart mobile devices, demonstrating the potential of the MoO3 nanosheets-based humidity sensors in future HMI systems.

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/smll.201902801



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