Low‐temperature catalytic activity of CO oxidation by uni‐size Pt30 cluster disks bonded to silicon substrate

Abstract

We investigated catalytic activity of CO oxidation by monatomic‐layered cluster disks, Pt30, bonded to a silicon substrate by means of ultrahigh‐sensitive temperature‐programmed desorption (TPD) mass‐spectrometry. It was found in the repeated TPD measurements with various reactant‐exposure amounts that this cluster‐substrate system possesses high ability of low‐temperature reductive activation of oxygen molecules, which is the rate‐determining step of the CO oxidation. This high‐performance is explained in terms of negative charges accumulated at a subnano interface between the cluster disk and the silicon substrate surface.