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a) High resolution C 1s XPS spectra for UV/O3-activated COC 6017 and COC 8007 (21.85 mW/cm2 for 15 min). b) O/C ratio versus exposure time for 21.85 mW/cm2 UV/O3-activated PE (filled square), COC 8007 (open square), COC 6013 (filled triangle) and COC 6017 (open triangle). Error bars represent ±std of the average O/C ratio (n=3).
