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Zinc oxide as gas sensor to H2S: (a) Selectivity measurements to different gases at 300 °C and (b) SEM image of ZnO nanoparticles. Reprinted/adapted with permission from Ref. [54]. 2017, Elsevier. ZnO as NO2 sensor: SEM images of ZnO like-flower at (c) 2 µm and (d) 200 nm, (e) dynamic response to NO2 at different gas concentrations, (f) selectivity measurement at 180°C to different gases. Reprinted/adapted with permission from Ref. [55]. 2021, Springer Nature.
