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XPS survey spectra, (a), Ti 2p XPS spectra (b), O1s spectra (c), and C 1s spectra (d), of untreated TiO2 grade IV samples (black line), treated (red line), untreated grade V (green line) and treated (blue line) samples. (GR IV: Titanium grade IV; GR V: Titanium grade V; T: SLA treated; NT: SLA non-treated; SI: Treated with TiO2 film).
