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X-ray diffraction (XRD) patterns of untreated Ti foil, Ti foil exposed to plasma of 800 W for 1 s and 10 s, TiO2 nanotubes with a 15 nm diameter (NT15) exposed to plasma of 800 W for 1 s and 10 s, and TiO2 nanotubes with a 100 nm diameter (NT100) exposed to plasma of 800 W for 1 s and 10 s. Ti = titanium, A = anatase crystal structure, R = rutile crystal structure.
