AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP19
Switching Dynamics of Ladder Molecules in Low Defect Self Assembled Monolayers

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: A.A. Dameron, The Pennsylvania State University
Authors: A.A. Dameron, The Pennsylvania State University
J.W. Ciszek, Rice University
J.M. Tour, Rice University
P.S. Weiss, The Pennsylvania State University
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We have fabricated 1-adamantanethiolate self assembled monolayers (SAMs) on Au(111) and characterized them with scanning tunneling micrsocopy.@footnote 1@ Adamantanethiol molecules have a bulky cage structure and orient in both fcc and hcp packing structures. The adamantanethiolate SAMs display fewer defect sites and less prominent domain boundaries than alkanethiolate SAMs. The switching dynamics of 2-thioacetylphenanthrene ("ladder molecules") and 4-thioacetyl-biphenyl molecules were studied by insertion of the molecules into both adamantanethiolate and short chain alkanethiolate SAMs. The switching dynamics in the two SAMs are similar; in both cases the molecules insert primarily into the defect sites in the monolayer and display switching between two states. @FootnoteText@@footnote 1@ L. F. Charles, M. S. Thesis, The Pennsylvania State University (1999).