Peculiar diffusion of fullerenes оп the surface with 2D adatom gas

Authors
  • Zotov A.V.

    Vladivostok State University of Economics and Service
    Vladivostok. Russia

  • Matetsky A.V.

    lnstitute of Automation and Control Processes FEB RAS
    Vladivostok, Russia

  • Bondarenko L.V.

    lnstitute of Automation and Control Processes FEB RAS
    Vladivostok, Russia

  • Gruznev D.V.

    lnstitute of Automation and Control Processes FEB RAS
    Vladivostok, Russia

  • Saranin A.A.

    lnstitute of Automation and Control Processes FEB RAS
    Vladivostok, Russia

Abstract

Si(111)√3x√3-(Au, In) surface constitutes а homogeneous Au/Si(111) reconstruction with two-dimensional gas of ln adatoms on it ln the present work, regularities of С60 migration on this surface have been investigated in the framework of the rate-equation theory. Using analysis of С60 island density as а function of temperature and deposition, it has been found that the critical cluster size equals 1in the whole temperature range studied, from 110 to 240 К, while activation diffusion barrier varies from 99 meV at 110-140 К to 370 meV at 160-240 К. The change of diffusion barrier is accounted to the peculiarity of С60 migration in а labyrinth built of ln adatoms, namely, at low temperatures diffusion is confined within the labyrinth channels, while at high temperatures molecules possess enough thermal energy to surmount the labyrinth walls.

Keywords: low-dimensional nanostructures; fullerenes; molecular films; adsorption; surface diffusion

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