Wearable and flexible humidity sensors hold great promise for expiratory comfort management. However, the high hysteresis and poor detection linearity restrict the immediate and accurate detection of humidity. Herein, we have prepared Ti₃C₂T_x MXene/chitosan/polyvinylidene difluoride aerogels with a controllable hydrophobic/hydrophilic surface to regulate the catch/escape behavior of H₂O molecules. The MXene aerogel-based humidity sensor demonstrates low hysteresis (3.2% relative humidity) and a high linear relationship (R² = 0.99). Integrated with a control circuit, an expiratory humidity monitoring system is constructed for nasal comfort management as a humidity switch. The exhaled breath humidity can be automatically regulated during dry exhalation conditions. This wearable humidity sensor enables the real-time monitoring and intelligent control of nasal exhaled humidity. This work represents a new avenue for improving breathing comfort and preventing respiratory diseases.

中文翻译：

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基于 Ti3C2Tx 气凝胶的可穿戴湿度传感器，具有低滞后和高线性度，用于呼气舒适度管理


可穿戴和灵活的湿度传感器在呼气舒适度管理方面前景广阔。然而，高滞后性和较差的检测线性度限制了湿度的即时和准确检测。在此，我们制备了 Ti₃C₂T_x MXene/壳聚糖/聚偏二氟乙烯气凝胶，具有可控的疏水/亲水表面，以调节 H₂O 分子的捕获/逃逸行为。基于 MXene 气凝胶的湿度传感器具有低滞后性（3.2% 相对湿度）和高线性关系 （R² = 0.99）。呼气湿度监测系统与控制电路集成，作为湿度开关用于鼻腔舒适度管理。在干呼气条件下，呼出的呼吸湿度可以自动调节。这款可穿戴湿度传感器能够实时监测和智能控制鼻腔呼出的湿度。这项工作代表了改善呼吸舒适度和预防呼吸系统疾病的新途径。