Fig. 5. (A) Response of the cpoPcCo/rGO hybrid sensor exposure to 100 ppm NH3 and recovery under UV light or without UV light; (B) resistance of the cpoPcCo/rGO hybrid sensor upon exposure to varying concentrations of NH3; (C) relationship of the response of the cpoPcCo/rGO hybrid sensor to the concentration NH3; (D) ten sensing cycles of the cpoPcCo/rGO hybrid sensor to 100 ppm NH3 (inset: the reproducibility characteristics of the cpoPcCo/rGO hybrid sensor to 100 ppm NH3 within 60 days) at 29 °C.
