Effect of RGD Peptide-Coated TiO₂ Nanotubes on the Attachment, Proliferation, and Functionality of Bone-Related Cells

Figure 5

XPS N1s spectra of silanized (APTES), bifunctional cross-linked (maleimide), and (c) RGD peptide-coated 100 nm TiO₂ nanotubes.