New monolayer phases of <i>n</i>-alkane thiols self-assembled on Au(111): Preparation, surface characterization, and imaging

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  • N. Camillone
    Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
  • P. Eisenberger
    Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
  • T. Y. B. Leung
    Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
  • P. Schwartz
    Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
  • G. Scoles
    Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
  • G. E. Poirier
    National Institute of Standards and Technology, Process Measurements Division, Gaithersburg, Maryland 20899
  • M. J. Tarlov
    National Institute of Standards and Technology, Process Measurements Division, Gaithersburg, Maryland 20899

抄録

<jats:p>We report the observation by scanning tunneling microscopy (STM) and low energy atom diffraction, of new, striped, structures at the surface of monolayers of n-alkane thiols [CH3 (CH2)n−1 SH with n=8,10,12] self-assembled on the (111) face of single crystal gold. These structures can be prepared by slow (room temperature) or thermally accelerated treatment of the well known c(4√3×2√3)R 30° phase formed by self-assembly in solution, or can be accessed directly by molecular beam deposition. With respect to the unit mesh of the gold substrate, the new striped structures can be described as p×√3 overlayers where 7.5≤p≤13. The discovery of these phases has implications for the understanding of the growth mechanisms and the pursuit of applications of this widely studied class of materials.</jats:p>

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