EPITAXY AND ATOMIC STRUCTURE DETERMINATION OF Au/TiO_2 INTERFACES BY COMBINED EBSD AND HRTEM

摘要

We have studied the effects of deposition conditions on the epitaxial orientation of Au on TiO_2(110) and on the atomic structure of Au/TiO_2 interfaces by combined EBSD and HRTEM. Two experimental conditions were explored consisting of deposition of a 12 run Au film at 300K followed by annealing at 770K and direct deposition of a 12 nm Au film at 770K. Deposition at 300K followed by annealing at 770K give rise to a (111)_(Au)//(110)_(TiO_2) epitaxial orientation relationship, while direct deposition at 700K temperature give rise to an epitaxial orientation relationship given by (112)_(Au)//(110)_(TiO_2). For both orientations, two epitaxial variants are observed which are twin related. The (112)_(Au)//(110)_(TiO_2) orientation has been found to minimize the interfacial lattice misfit while maximizing the number of Au-Ti bonds across the interface.