ATOMIC-FORCE MICROSCOPY STUDY OF PD CLUSTERS ON GRAPHITE AND MICA

We report on a growth of single crystals of Pd clusters on highly orie nted pyrolytic graphite (HOPG) and mica. On HOPG, edges of the cluster s were parallel to the imaged substrate atom rows. On mica, both clust ers with edges parallel to and 30-degrees off from the imaged atom row s were observed. The atomic resolution with a separation of 0.28 nm on Pd clusters on mica was obtained with atomic force microscopy (AFM). We propose structural models for the epitaxial nature of Pd on HOPG an d mica.