Experimental observation of two-dimensional charge polarization in unisized platinum cluster disk bonded to silicon(1 1 1) surface

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

“…to control the internal electric, magnetic and chemical fields . Indeed, we have shown successfully in our experimental and theoretical studies that two‐dimensional charge polarisation is created at a subnano interface between a monatomic‐layered platinum cluster disk, Pt 30 , and a silicon substrate surface. This originates from electron accumulation at the subnano interface by electron transfer from Pt to Si in a similar manner to the Schottky barrier junction, and the resulting positive charge locating at the centre of the cluster disk .…”

A Molecular Platinum Cluster Junction: A Single-Molecule Switch

“…In conclusion, we have theoretically studied single molecule junctions incorporating a Pt 6 cluster, showing that it acts in an analogous fashion to a double tunneling barrier due to two (originally degenerate) states which align at the Fermi level. These states do not, however, stem from the Pt unit alone, but specifically from two apical Pt atoms and their neighboring S atoms.…”

“…We will show that the HOMO of (SC 4 S) 2 Pt 6 consists of two degenerate levels which get pinned to the Fermi level when the molecule is placed between two gold electrodes. However, these two levels do not originate simply from the Pt 6 unit, but contain states localized on the ligands also. Moreover, interesting interference features appear in the transmission curve at the Fermi level.…”

Novel catalytic functions induced by charge accumulation at subnano interface between unisize metal cluster disk and semiconductor surface

“…Figure shows space‐resolved tunneling spectra measured above a Pt 30 disk on the Si surface, where each spectrum was obtained by averaging 10 to 30 sets of the up‐and‐down scans of the bias voltage at a given probe position . The uncertainty of the probe position on the surface was estimated to be in the range of 0.020–0.032 nm by measuring the drifting velocity (2.5 × 10 −4 nm s −1 ) of the sample and/or the probe .…”

“…In this report, we present our studies on charge accumulation and resulting catalytic activity exhibited by a monatomic‐layered unisize Pt cluster disk supported on the (111) surface of a Si substrate. The geometry and the charge distribution of the cluster were measured by means of scanning–tunneling microscopy and spectroscopy (STM / STS) . The catalytic performance driven by the accumulated electrons was investigated for thermal oxidation of CO as a benchmark reaction of the catalysis by means of temperature‐programmed desorption (TPD) mass spectroscopy .…”