Fig. 1. (a) Top-view SEM images of the as-grown MgZnO NWs; (b) EDS image of MgZnO NWs; (c) Single morphology of MgZnO NW sample for TEM; (d) High resolution TEM of the MgZnO nanowire, insert images show the corresponding SAED pattern, respectively

Fig. 2. (a) XRD of the ZnO nanowires and MgZnO nanowire; (b) PL spectrum of the ZnO nanowires and MgZnO nanowire. The PL shows the peak of MgZnO blue shift

Fig. 3. I-V characteristics of the ZnO NWs photodetectors (a) and ZnO-GQDs NWs photodetectors (b); I-T characteristics of the ZnO NWs photodetectors (c) and ZnO-GQDs NWs photodetectors (d)