Low-cost Highly Sensitive Interdigitated Capacitive Humidity Sensor for Breathing Application

A highly sensitive, facial, low-cost, eco-friendly and flexible Interdigital electrode (IDE) humidity sensor for field and medical application is presented in this work. The sensor is designed from copper tap as electrodes with a non-woven paper both as a sensing layer and substrate material. The response of sensor is observed for the percentage relative humidity (%RH) ranging from 30-100% is from 50pF-944pF, having fast response time of ~1.2s and recovery time of ~1.75s with sensitivity of 14.75pF/%RH. The sensor stability and repeatability response is also observed by testing it for different temperature values. The fabricated sensor is efficient in term of response, sensitivity, and stability which makes it promising candidates for medical and field applications.