Humidity sensing is important to a variety of technologies and industries, ranging from environmental and industrial monitoring to medical applications. Although humidity sensors abound, few available solutions are thin, transparent, compatible with large-area sensor production and flexible, and almost none are fast enough to perform human respiration monitoring through breath detection or real-time finger proximity monitoring via skin humidity sensing. This work describes chemiresistive graphene-based humidity sensors produced in few steps with facile liquid phase exfoliation (LPE) followed by Langmuir-Blodgett assembly that enables active areas of practically any size. The graphene sensors provide a unique mix of performance parameters, exhibiting resistance changes up to 10% with varying humidity, linear performance over relative humidity (RH) levels between 8% and 95%, weak response to other constituents of air, flexibility, transparency of nearly 80%, and response times of 30 ms. The fast response to humidity is shown to be useful for respiration monitoring and real-time finger proximity detection, with potential applications in flexible touchless interactive panels.

中文翻译：

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基于液相剥离石墨烯的超快湿度传感器

湿度传感对各种技术和行业都很重要，从环境和工业监测到医疗应用。尽管湿度传感器比比皆是，但很少有可用的解决方案是薄的、透明的、与大面积传感器生产兼容且灵活的，几乎没有一个解决方案能够足够快地通过呼吸检测或通过皮肤湿度感应进行实时手指接近度监测来执行人体呼吸监测。这项工作描述了基于石墨烯的化学电阻式湿度传感器，通过简单的液相剥离 (LPE) 和 Langmuir-Blodgett 组装，通过几个步骤生产，从而实现几乎任何尺寸的活性区域。石墨烯传感器提供了独特的性能参数组合，随着湿度的变化，电阻变化高达 10%，相对湿度 (RH) 水平在 8% 和 95% 之间的线性性能，对空气的其他成分的弱响应，柔韧性，接近 80% 的透明度和 30 毫秒的响应时间。对湿度的快速响应被证明可用于呼吸监测和实时手指接近检测，并在灵活的非接触式交互式面板中具有潜在应用。