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. Author manuscript; available in PMC: 2019 Oct 8.
Published in final edited form as: ACS Biomater Sci Eng. 2018 Sep 12;4(10):3471–3477. doi: 10.1021/acsbiomaterials.8b00886

Figure 3. Confirmation of PDA coating by XPS.

Figure 3.

(A) Substrate characteristic XPS signals before and after PDA coating. Al 2p (73 eV), C1s (CO-O bond, 288.5 eV) and Ti2p (455 eV) signals were used for comparisons. (B)-(D) C 1s peaks of PDA-coated surfaces. (B) Aluminum, (C) PMMA, (D) titanium.