Study on structural changes of solid surfaces due to tribological interaction in sliding interfaces

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We have studied the correlation between the tribological properties and the structural changes of polycrystalline Ag films deposited on the Si(111)√<3>×√<3>-Ag reconstructed surface that was formed by one atomic layer of Ag atoms chemically bonded to each of the topmost Si atoms of the substrate. As a result, the Ag crystallites in the film are oriented to <111> direction of the substrate due to frictional effect (tribo-assisted reorientation) under the elastic-contact condition, when the film thickness was less than 10 nm in average. In addition, we have demonstrated that the re-deposited Ag film grows epitaxially on the reoriented surface, and that the difference in the degree of orientation can be controlled between the reoriented area and the non-reoriented area by controlling the surface composition of the substrate. These findings show the feasibility of novel film processing technology due to tribo-assisted reorientation.