DEPOSITION AND STM OBSERVATION OF SIZE-SELECTED PLATINUM CLUSTERS ON SILICON(111)-7X7 SURFACE

摘要

We investigated individual size-selected platinum clusters deposited on asilicon(111)-7X7 surface by means of a scanning-tunneling microscope (STM). The sample was prepared by collision of size-selected platinum cluster cations on the surface at a collision energy of 0.5-3 eV per platinum atom. It was found that the clusters were deposited firmly on the surface without dissociation nor aggregation. The real diameters of the clusters were estimated by considering the radius of the STM tip used for the measurement and the tunneling distance between the cluster and the tip.