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H2 sensing of ZnO nanostructures in different atmospheres of synthetic air and nitrogen: (a) RT; (b) evaluated temperature of 200 °C; (c) RT and UV irradiation. NH3 sensing of ZnO nanostructures in air and nitrogen: (d) RT; (e) 200 °C; (f) RT and UV irradiation. Reproduced with permission from [44].
