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XPS survey spectra (left) and high-resolution spectra of the C1s (middle) and O1s (right) regions; from top to bottom: (a) ungrafted PFSc, (b) thermal grafted 1 h – Oz 20 min, (c) thermal grafted 3 h – Oz 20 min, (d) UV grafted 1 h – Oz 20 min, and (e) UV direct grafted 1 h.
