Figure 1
(A) (a) Atom-resolved noncontact atomic force microscopy (NC-AFM) image of nearly stoichiometric CeO2 (111) surfaces. (b and c) Model of the bulk-terminated structure of CeO2 (111) with oxygen-layer termination and cerium-layer termination.41 Copyright 2003, American Chemical Society. (B) NC-AFM images of slightly reduced CeO2 (111) surface with different densities of oxygen vacancies by different annealing periods: (a) after annealing for 120 s; (b) after annealing for 240 s; and (c) model of multiple defects of line defects and triangular defects observed in b.40 Copyright 2002, Elsevier. (C) Successive NC-AFM images of the same area of a slightly reduced CeO2 (111) surface with multiple defects (a) before and (b and c) after exposure under oxygen exposure at radiation therapy (RT). Multiple defects and point defects were healed by oxygen atoms during the 91 s taken for scanning. The same positions were indicated by white circles for a guide.41 Copyright 2003, American Chemical Society.
