Figure 4
(a) XPS spectra for Zn2p of ZNRs annealed with the one-step annealing process and inserted figure is the trend of the binding energy of Zn 2p. (b) Zn 2p in XPS spectra for ZNRs annealed with the VA-OA process, and inserted figure is the trend of the binding energy of Zn 2p for as growth ZNRs (AG), the oxygen flow of 1 sccm (V-1), 5 sccm (V-5), 10 sccm (V-10) and 20 sccm (V-20) in the VA-OA- process. (c) Trend of Ovac/Olat in XPS spectra of O 1s for ZNR annealed with the VA-OA process.
