Abstract
The oriented growth of gold films from vapor phase occurs on (0001) sapphire substrates heated to 500°C. Epitaxy is observed when gold nanocrystals reach a certain size under fixed external conditions. In the case of weak adhesion between a crystal and substrate, gold is crystallized on the edges of atomically smooth steps of the substrate in the form of a nanocrystals, mainly with the following three epitaxial relationships maintained: the (111), (100), and (211) planes with high atomic density are oriented parallel to the (0001)Al2O3 plane. At lower temperatures, gold is crystallized on substrates in the form of nanocrystals 100–120 nm in size, ordered along the step edges and having no preferred orientation.
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