Grafting and self-organization of trimethylsilylacetylenes on Au(111)

COLL 328

Nathalie Katsonis1, Alexandr Marchenko1, Denis Fichou1, Corinne Aubert2, and Max Malacria2. (1) LRC Semi-Conducteurs Organiques, CEA - CNRS - Paris 6 Univ, Batiment 462, Gif-Sur-Yvette, 91191, France, (2) Organic Division – Department of Chemistry, Université Pierre et Marie Curie - Paris 6, Université Paris 6 - 4, Place Jussieu, F-75252 Paris Cedex 05, Paris, 75005, France
Self-assembled monolayers (SAMs) of thiols on gold present a wide range of applications in interfacial chemistry. An alternative system consists in trimethylsilylacetylene (TMSA)-functionalized polyunsaturated chains on Au(111). Scanning tunneling microscopy at the liquid-solid interface evidences that linear TMSA form self-organized domains on Au(111), in which molecules stand upright on the surface. In order to better understand the interactions governing this system, we performed systematic STM investigations of linear silanes, which in particular evidence that a modification of the TMSA head drastically influences self-assembly. This predominant role of the TMSA head is explained by two factors: (i) the TMSA overlayers are commensurate to the metallic adlattice and (ii) the triple bond of TMSA activates the Si atom and induces the creation of a local surface complex. The high stability of the TMSA-based SAMs make them well adapted to the study of charge transport through single molecules by scanning tunneling spectroscopy.

 

Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom J, Oral

Division of Colloid and Surface Chemistry

The 227th ACS National Meeting, Anaheim, CA, March 28-April 1, 2004