To demonstrate its applicability, the LPO2-Ade38090/Glu30010 sensor was used to repeatedly measure the CO2 level in exhaled breath (Figure ). Therefore, the flexible sensor was directly placed under ambient conditions without the need of a mask. In view of their rapid response, high sensitivity, and good selectivity under ambient conditions as well as their mechanical properties, the developed LP-NC sensors may prospectively be employed as real-time wearable breath detection sensors.