Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Metal substrates: Adsorption of organic / bio molecules IV

O 27.3: Talk

Tuesday, March 15, 2011, 11:45–12:00, PHY C213

Structure of self-assembled monolayers of 1,1'-biphenyl-4-thiols on Au(111): A combined STM, LEED and XPS study — •Dan G. Matei, Heiko Muzik, Andrey Turchanin, and Armin Gölzhäuser — Physik supramolekularer Systeme und Oberflächen, Universität Bielefeld

Self-assembled monolayers (SAMs) of aromatic molecules are in the focus of research due to their applications in nanotechnology ranging from the fabrication of biofunctional surfaces to the generation of free-standing graphene. However, important structural issues of aromatic SAMs on metal substrates are not yet well understood. In this contribution, we report on the structure of 1,1'-biphenyl-4-thiol (BPT) SAMs on Au(111) prepared from solvents and by vapour deposition in vacuum. We analyze molecular resolved scanning tunneling microscopy (STM) images of "as prepared" and annealed samples. Upon vacuum annealing regular molecular superstructures form on Au(111). Their unit cells were investigated by low-energy electron diffraction (LEED). X-ray photoelectron spectroscopy (XPS) was employed to study the chemical composition and effective thickness. We present a comprehensive analysis of these data.