Fig. 4.
Morphology of Au/CeOx/TiO2 (110). (A) STM image of a CeOx/TiO2(110) surface. Ce was deposited at 600 K under an atmosphere of O2 (≈1 × 10−7 Torr) and then the sample was annealed at 900 K in O2. (B) STM image for a Au/CeOx/TiO2(110) surface. The gold was deposited on the same area shown in A at 298 K. Approximately 6% of the surface was covered with Au. (C) STM image obtained after annealing the system in B to 600 K. All of the STM images correspond to an area of 20 × 20 nm and imaging conditions of Vt = 1.5 V and It = 0.03 nA.