NANOMETER-SIZE PLATINUM PARTICLE ARRAYS - CATALYTIC AND SURFACE CHEMICAL-PROPERTIES

A new type of spatially controlled model catalyst was prepared by elec tron beam lithography. The catalyst consisted of a square array of dis c shaped platinum particles 50 nm in diameter and spaced at 200 nm on an oxidized silicon wafer. The catalyst was cleaned of surface contami nants by low energy neon ion sputtering without adversely altering the characteristics of the array. Catalytic activity was confirmed by per forming ethylene hydrogenation at high pressure. Evidence of deuterium spillover was seen by thermal desorption experiments.