AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS3-TuA

Paper SS3-TuA1
Adsorption of Substituted Butadienes on Si(100)

Tuesday, November 4, 2003, 2:00 pm, Room 328

Session: Organic Functionalization of Semiconductor Surfaces
Presenter: L.C. Teague, University of North Carolina at Chapel Hill
Authors: L.C. Teague, University of North Carolina at Chapel Hill
J.J. Boland, Trinity College Dublin, Ireland
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Current interest in the addition of small organics to the Si(100) surface is driven by their potential applications in "bottom-up" fabrication methods. The ability to strategically place and/or manipulate individual molecules into functional structures on surfaces has potentially important implications for molecular electronics.@footnote 1,2@ Although several studies have focused on these types of reactions, it is evident from our previous work with 1,3-cyclohexadiene (1,3-CHD)@footnote 3@ that these reactions are more complicated than originally assumed. STM studies of other organics such as 2,3-dimethyl-1,3-butadiene (DMBD) and 2,3-dimethoxy-1,3-butadiene (DMeOBD) on Si(100) can provide additional information about cycloaddition reactions. Both systems are similar to 1,3-CHD in that they are systems of 4@pi@ electrons, therefore possessing the same reaction possibilities as 1,3-CHD, however they are chain-like rather than ringed structures. Reaction products for DMBD and DMeOBD can be characterized in the same manner as those of 1,3-CHD, i.e., via the location of the remaining C=C bond in the adsorbed molecule. We present a study of the reactions of DMBD and DMeOBD on Si(100), and contrast both the appearance and attachment geometry for reaction products of DMBD and DMeOBD with those of cyclic molecules like 1,3-CHD. Several initial differences between 1,3-CHD products and those of DMBD and DMeOBD are reported, including the presence of dimer buckling induced on the surface after exposure to DMBD and DMeOBD. Different attachment geometries available to chain-like molecules such as DMBD and DMeOBD are shown to account for the dimer buckling observed on the surface. @FootnoteText@@footnote 1@Lopinski, G. P.; Wayner, D. D. M.; Wolkow, R. A. Nature, 2000, 406, 48; Bent, S. F. Surf. Sci. 2002, 500, 879, and references therein.@footnote 2@Whitesides, G. M.; Love, C. J. Sci. Am. 2001, 285, 39.@footnote 3@Teague, L. C.; Boland, J. J. J. Phys. Chem. B 2003, 107, 3820.