Abstract
Gold-rutile interfaces have been extensively investigated particularly because of their importance to heterogeneous catalysts for many reactions such as CO oxidation and water-split reactions. Herein, we systemically study preferential orientation relationships (ORs) and atomic structures at gold-rutile interfaces using a model system of dewetted gold particles on a single-crystal rutile substrate. Four previously reported ORs are confirmed, and more importantly, a few irrational ORs (i.e., which cannot be described by low-indexed planes and directions) are newly discovered. These ORs agree with theoretical possibilities predicted according to the geometrical constraint of adjacent lattices. In addition, atomic rearrangement is observed at these interfaces, particularly in those with irrational ORs.
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