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(a) Sensor response and (b) recovery time of the nanowire device towards 0.5 ppm NO2 in air under illumination with different photon energies and constant photon flux; (c) Sensor response of three different concentrations of NO2 under illumination with different photon flux levels (Eph = 3.67 ± 0.05 eV). Reproduced with permission from [39].
