90004619

open access

Accepted Manuscript

XPS and STM study of TiO2(110)-(1 x 1) surfaces immersed in simulated body fluid

English (英語)

Surface Science

668

61-67

Elsevier B.V.

2018-02

2020-03-01

Rutile titanium dioxide (TiO2) (110)-(1 x 1) surfaces prepared in ultrahigh vacuum (UHV) were removed from the UHV, immersed in Hank's buffered salt solution (HBSS), and then re-introduced to the UHV to be examined for an atomic-level study of the osteoconductivity of TiO2. X-ray photoelectron spectroscopy (XPS) showed the adsorption of phosphate ions and divalent Ca ions from the HBSS. The density of the phosphate ions increased with the immersion time for up to 1 min and remained constant with further immersion time up to 1 week. Unlike in the case of the phosphate ions, the density of the Ca ions decreased with the immersion time after reaching the maximum value at 1 min immersion. Consequently, calcium phosphate was not formed on the (1 x 1) surface in the 1-week immersion. Scanning tunneling microscopy revealed molecule-sized spots covering the surfaces immersed for 1 min and longer. On the basis of density analysis by XPS, the spots were hypothesized to represent phosphate ions. Phosphate ions on the (1 x 1) surface are unable to undergo arrangement needed to facilitate the epitaxial growth of the brushite.

STM

学術雑誌論文

This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/