Sno2/Polyvinyl Alcohol Nanofibers Wrapped Tilted Fiber Grating for High-Sensitive Humidity Sensing and Fast Human Breath Monitoring

Chemiresistive sensor for breath frequency and ammonia concentration in exhaled gas over a PVA/PANI/CC composite film

“…[11][12][13][14][15] The use of humidity sensors for breath monitoring has been reported as a wrapped tilted fiber grating, capacitive sensor, paper-based wearable noninvasive sensing devices for non-smokers, and diagnostic tools for pneumonia, pulmonary disease, and a person's respiratory frequency. 16,17 The basic strategy for humidity sensing is monitoring surface induced properties of materials such as resistance, optical permeability, and mechanical. 18 The surface interaction of humidity also generates voltage and current to use the materials as self-fueled materials as well as in the form of hydroelectric cell to generates energy.…”