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. 2012 Nov 30;7(11):e50326. doi: 10.1371/journal.pone.0050326

Figure 2. XPS spectra for titanium surface analysis.

Figure 2

(A) initial surface: TiO2, (B) Titanium with catechol grafted at its surface: TiCOOH, (C) Titanium with catechol bonded to PAH: TiCOOPAH.