[ Instrument Network Instrument Development ] Human-computer interaction technology has received wide attention due to its important applications in the Internet of Things (IoT), such as wearable electronics and telemedicine monitoring. For human-computer interaction systems, smart sensors play a key role because they effectively "convert" various signals from the human body into information that the machine can recognize. Therefore, it is especially important to develop various smart sensors with high sensitivity and fast response. Conventional sensors typically detect signals in direct contact, such as pressure sensors, strain sensors, and the like. However, direct contact sensing not only introduces unavoidable mechanical wear, but also limits its application to a wider range of applications, such as in toxic or hazardous environments. In order to overcome these shortcomings to meet a variety of application requirements, flexible non-contact humidity sensors have become an important complement to existing sensors and can be used as a new control method for advanced human-computer interaction systems.
Recently, Shen Guozhen, a researcher at the State Key Laboratory of Superlattice, Institute of Semiconductors, Chinese Academy of Sciences, successfully developed a flexible and transparent high-performance humidity sensor based on MoO3 nanosheets, which was synthesized by a low-cost, simple solution method. The prepared humidity sensor exhibits excellent sensitivity to external relative humidity (RH), and the current changes by 5 orders of magnitude when RH changes from 0% to 100%. In addition, the sensor has fast response (<0.3 s) and recovery time (<0.5 s), also exhibits long-term stability (> 1 month) and has excellent mechanical flexibility. At the same time, the researchers developed a wearable humidity analysis system for environmental RH monitoring and non-invasive human respiratory monitoring. In addition, the remote non-contact interactive sensing feature of the humidity sensor is applied to two human-computer interaction systems, a non-contact multi-level switch and a flexible non-contact control screen.
This work provides a huge application prospect and feasible process for the intelligent human-computer interaction system based on the humidity sensor based on oxide nano materials. This work was supported by the National Natural Science Foundation of China and the Key Research Project of Frontier Science of the Chinese Academy of Sciences. The research results were published in the journal Small (DOI: 10.1002/smll.201902801).

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