Figure 4

XRD spectra of treated ZnO NWs. (a) ZnO NWs which were treated under NH₃ at various temperatures, flows of NH₃, nitridation times and ramp rates arranged in the same order as Table 1. (b) ZnO NWs which were treated repeatedly under 250 sccm of NH₃ at 600°C for 60 min; see Table 1.