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. 2021 Feb 17;13(2):269. doi: 10.3390/pharmaceutics13020269

Figure 3.

Figure 3

X-ray photoelectron spectroscopy (XPS) results of gelatin-conjugated poly(dimethylsiloxane) (PDMS) surface compared to those of bare PDMS. BE: binding energy. XPS elemental composition analyses in the regions of (A) N 1s (Nitrogen), (B) C 1s (Carbon), (C) O 1s (Oxygen) and (D) Si 2p (Silicon) on bare and gelatin conjugated PDMS.