STM INVESTIGATION OF PLATINUM OLIGOMER CLUSTERS PREPARED BY RADIOLYSIS

Platinum oligomer clusters were prepared by radiolysis in aqueous solu tion containing polyacrylic acid, then deposited on a freshly cleaved HOPG surface and imaged by STM. Well-resolved features of these cluste rs were obtained. The smallest aggregates were found to contain mainly dimers up to trimers and tetramers, even though the presence of monom ers could not be excluded. The stabilizing polymer was not detected as interfering primarily in the adsorbate densities.