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

Figure 4. AFM images acquired in tapping mode of titanium surface, titanium with catechol anchored, titanium with catechol covalently bonded to PAH, and finally with PEM physisorbed (PAH-PSS)7.

Figure 4

A, A′: TiO2. B, B′: TiCOOH. C, C′: TiCOOPAH. D, D′: TiCOO(PAH-PSS)7. For X = A, B, C or D: X = 2D topographic image, X′ = phase.