Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks
O 51.7: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1C
6-Mercaptopurine self-assembled monolayers on Au(100)-hex: revealing the fate of gold ad-atoms — •Kathrin Müller1, Pilar Carro2, Flavia Lobo Maza3, Carolina Vericat3, Roberto C. Salvarezza3, Ulrich Starke1, Klaus Kern1,4, and Doris Grumelli3 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Área de Química Física, Departamento de Química, Universidad de La Laguna, Tenerife, Spain — 3Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, UNLP- CONICET- La Plata, Argentina — 4Institut de Physique, Ecole Polytechnique Fédéerale de Lausanne, Switzerland
Self-assembled monolayers (SAMs) can be used as inexpensive surface coatings for applications in sensors, surface protection and many more. Especially interesting is the interaction of the anchoring group (thiol, silane, phosphate) with the metallic substrate (e.g. gold, copper, silver), which determines the main properties of the SAMs. Here, we report on the adsorption of 6-mercaptopurin (6MP) on (100)-orientated reconstructed gold. The SAM was investigated with STM, LEED, XPS, electrochemical techniques and DFT calculations. We show that 6MP is unable to form vacancy islands in contrast to other thiol-gold SAMs, although its adsorption lifts the hex reconstruction. Thus, there is a large excess of gold adatoms in contact with the thiol molecules, which form disordered molecule-gold clusters. The remaining molecules arrange in two different well-ordered adatom-free domains. Our results show that the formation of ordered thiol-gold adatom complexes is not a general process and depends strongly on the thiol molecule.