Unisized two-dimensional platinum clusters on silicon(111)-7×7 surface observed with scanning tunneling microscope

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  • Hisato Yasumatsu
    Genesis Research Institute, Inc. Cluster Research Laboratory, Toyota Technological Institute: in East Tokyo Laboratory, , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
  • Tetsuichiro Hayakawa
    Genesis Research Institute, Inc. East Tokyo Laboratory, , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
  • Shin’ichi Koizumi
    Genesis Research Institute, Inc. East Tokyo Laboratory, , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
  • Tamotsu Kondow
    Genesis Research Institute, Inc. Cluster Research Laboratory, Toyota Technological Institute: in East Tokyo Laboratory, , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan

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<jats:p>Uni-sized platinum clusters (size range of 5–40) on a silicon(111)-7×7 surface were prepared by depositing size-selected platinum cluster ions on the silicon surface at the collision energy of 1.5 eV per atom at room temperature. The surface thus prepared was observed by means of a scanning tunneling microscope (STM) at the temperature of 77 K under an ambient pressure less than 5×10−9Pa. The STM images observed at different cluster sizes revealed that (1) the clusters are flattened and stuck to the surface with a chemical-bond akin to platinum silicide, (2) every platinum atom occupies preferentially the most reactive sites distributed within a diameter of ∼2nm on the silicon surface at a cluster size up to 20, and above this size, the diameter of the cluster increases with the size, and (3) the sticking probability of an incoming cluster ion on the surface increases with the cluster size and reaches nearly unity at a size larger than 20.</jats:p>

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