Graphene Oxide-Based Sensor for Human Breath Monitoring

This letter presents a human nose breath sensor based on partially reduced graphene oxide (PrGO) operating at room temperature. The sensing layer is developed by drop casting graphene oxide (GO) on a glass substrate with silver electrodes and was partially reduced thermally at 150 °C. The results with GO film have also been compared. The developed sensor was successful in detecting various breath patterns by observing the frequency and amplitude of the sensor's current change to exposure to nose breath. The sensor was capable of differentiating between slow, normal, and fast breathing based on the response and recovery times. This sensor can be very useful for characterization of diseases, such as asthma, chronic obstructive pulmonary disease, sleep apnea, and cardiac arrest, where the person's respiration rate is measured.