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(a) XPS wide scan spectra of as-deposited and O2-plasma-treated (for 9 min) SLs with high-resolution individual core level spectra of (b) C-1s and (c) Zn-2p. O-1s spectra obtained from the as-coated and plasma-treated (for 9 min) SLs are also shown in (d) and (e); (f) Wide scan spectra of the ZnO NRs grown on as-deposited and O2-plasma-treated (for 9 min) SLs with high-resolution O1-s core level spectra of the NRs grown on (g) as-deposited and (h) O2-plasma-treated (for 9 min) SLs.
