Additionally, the XPS spectrum was able to verify that the Ti surface's substance adsorbed was peptides through elemental feature peak analysis. Peptides layers are terminated by O and N groups. The depth analysis of N 1s and O 1s spectra are shown in Fig. 2D. An N 1s peak at 400.0 eV and an O 1s peak at 532.2 eV were derived from the peptides' amide groups. An O 1s peak at 530.2 eV was derived from TiO2. It was confirmed the successful modify of Ti surface with chimeric peptides.