There is much interest today in novel nanostructured materials. For instance Pt-plated nanoporous gold (NPG), a catalytic heterostructure with an ultrathin (5 nm) film of Pt grown on the nanoscopically curved and rough surfaces of NPG, is a promising catalyst for fuel-cell applications. But unlike film growth on planar surfaces, epitaxial growth on nanoscopically non-planar surfaces is not well understood. Indeed, nanoscale effects are expected to cause non-planar epitaxial growth to deviate substantially from classical thin-film growth. As epitaxially layered nanostructures gain industrial applications, these deviations in film growth become important to consider. This book presents an introduction to thin-film growth mechanics, followed by a review of the Pt-on-Au system. The thermodynamic effects of high curvatures on film growth are examined, and the impact of nanoscopic roughness on growth is explored experimentally. Some novel growth characteristics observed for the first time are discussed, and an atomistic strain-energy mediated model for 3d thin film growth is proposed. This model may be applied to any lattice-mismatched epitaxial system.
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