Flexible Humidity Sensor Based on Electrochemically Polymerized Polypyrrole

Environmental sensing is an important task in the development of infrastructures for the applications of the Internet of things. In this work, we introduce a flexible humidity sensor based on electrochemically polymerized polypyrrole to absorb or desorb water vapors to detect relative humidity (RH). A test platform was built to mix the different amounts of dry and wet air for the relative humidity ranging from 15% to 95%. Experimental results show that the response time from 20% to 90% RH of the sensor was 505 seconds and the recovery time from 90% to 20% RH was 328 seconds with good repeatability during three cycles. The wide dynamic range, excellent repeatability and reasonable response time make the sensor applicable for home monitoring applications. Furthermore, the flexible sensor is suitable for embedding into wallpaper or decorations for promising future systems to map the environmental status of buildings and homes.

环境感知是物联网应用基础设施发展中的一项重要任务。在这项工作中，我们介绍了一种基于电化学聚合聚吡咯的柔性湿度传感器，它通过吸收或解吸水蒸气来检测相对湿度（RH）。搭建了一个测试平台，将不同量的干燥和潮湿空气混合，使相对湿度在15%到95%之间变化。实验结果表明，该传感器从20%到90%相对湿度的响应时间为505秒，从90%到20%相对湿度的恢复时间为328秒，在三个周期内具有良好的重复性。宽动态范围、优异的重复性和合理的响应时间使该传感器适用于家庭监测应用。此外，这种柔性传感器适合嵌入壁纸或装饰品中，有望用于未来的系统以绘制建筑物和家庭的环境状况图。