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(a) Calibration curves of Sensors A (PDDA), B (PEI) and C (PAH). To make easier the comparison between the curves shapes, calibration curves of Sensors A and B are adjusted on the left axis, whereas that of Sensor C is adjusted on the right axis; (b) Response of the Sensors to dynamic variations of oxygen concentrations from 0% to 100% repeatedly in 3 cycles. Reprinted with permission from Ref. [28].
