In this study, a nano-flower MoSe₂-SnS₂ humidity sensor with S defects with fast response and low humidity hysteresis was prepared for respiratory and skin humidity detection. The increase in S vacancy defects provides more adsorption sites for water molecules and also facilitates the decomposition of water molecules and improves proton conduction. The construction of MoSe₂-SnS₂ composite prompted an increase in the specific surface area of material exposing more active sites. This promoted the adsorption of water molecules on the device surface and accelerated the electron transfer between water molecules and the sensitive layer. The nanoflower structure of MoSe₂-SnS₂ can provide channels for water molecules to be transported into the interior of material, which can effectively shorten the response time of sensor. MoSe₂-SnS₂ sensor exhibited faster response/recovery time (13/15 s), lower humidity hysteresis (1%) and higher stability in the range of 11%-95% RH. In addition, MoSe₂-SnS₂ humidity sensor can successfully detect respiration and skin moisture, showing the application potential of the sensor in the detection of respiration and skin humidity. This study provides a new idea for the preparation of high-performance 2D nano humidity sensors and promotes the expansion of new application areas for the sensors.

中文翻译：

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用于呼吸监测的花形 MoSe2-SnS2 湿度传感器的制备及机理研究


在本研究中，制备了一种具有 S 缺陷、响应速度快、湿度滞后的纳米花 MoSe 2-SnS 2 湿度传感器，用于呼吸和皮肤湿度检测。S 空位缺陷的增加为水分子提供了更多的吸附位点，也促进了水分子的分解，改善了质子传导。MoSe 2-SnS₂ 复合材料的构建促使材料比表面积增加，暴露出更多活性位点。这促进了水分子在器件表面的吸附，加速了水分子与敏感层之间的电子转移。MoSe 2-SnS₂ 的纳米花结构可以为水分子输送到材料内部提供通道，从而有效缩短传感器的响应时间。MoSe 2-SnS₂ 传感器在 11%-95% RH 范围内表现出更快的响应/恢复时间 （13/15 s）、更低的湿度滞后 （1%） 和更高的稳定性。此外，MoSe_{2-SNS 2} 湿度传感器可以成功检测呼吸和皮肤湿度，显示出传感器在呼吸和皮肤湿度检测方面的应用潜力。本研究为制备高性能二维纳米湿度传感器提供了新思路，促进了传感器新应用领域的拓展。