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(a) RT PL spectra of ZnO NRs grown on SLs plasma-treated for different time intervals; (b) IUV and IVIS as a function of time measured from NRs grown on (0, 3, 6, 9, 12, 15 min) O2-plasma-treated SLs; (c) RT PL spectra of SLs (as-coated and O2-plasma-treated for 9 min).
