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Au substrate was prepared by Au evaporation on Si(111) surface. Au surface was composed of Au grains with typical diameter of about 50 nm with atomically flat terraces. TiO 2 nanostructures were created by electron gun evaporation of Ti while simultaneous dosing of high purity O 2 gas. The pressure of oxygen was kept at 5·10 −8 mbar and controlled by means of residual gas...