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We have studied the growth mode and morphology of Ni clusters on a TiO 2 (110) surface with a wide terrace using scanning tunneling microscopy (STM) at a low coverage (less than 3 atoms nm Above the coverage of 1.0 atoms nm -2 , an increase in the cluster height occurs, retaining an almost constant lateral size. It is proposed that the interaction of the Ni cluster and the support surface regulates the Ni cluster size.

The structure of low coverage Ni atoms on the TiO2(110) surface was studied using polarization dependent EXAFS. We found that Ni atoms interacted with oxygen atoms at the n 1 1 step edges, where atomically dispersed Ni species were found with Ni-O distances at 0.199 ± 0.002 nm and 0.204 ± 0.003 nm in parallel and perpendicular directions to the Koike et. al. 2 TiO2(110) surface, respectively. The location corresponded to the virtual Ti site if the next TiO2 layer was created on the topmost TiO2 surface. The Ni location is mainly determined by the dangling bond directions of the surface oxygen atoms.

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