Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 37: Metal substrates: Adsorption of organic / bio molecules V
O 37.10: Vortrag
Mittwoch, 25. März 2009, 17:15–17:30, SCH A118
Scanning tunnelling microscopy study of 4′-nitro-1,1′-biphenyl-4-thiol self-assembled monolayers on Au(111) — •Heiko Muzik, Laxman Kankate, Andrey Turchanin, and Armin Gölzhäuser — Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld
Self-assembled monolayers (SAMs) of 4′-nitro-1,1′-biphenyl-4-thiol (NBPT) on gold is a useful system for applications in chemical nanolithography1. Nanopatterning of NBPT SAMs by electrons or extreme UV radiation results in the formation of amino terminated cross-linked areas1,2. This transformation can flexibly be utilized for the engineering of complex molecular assemblies on gold surfaces, as for instance protein chips3. Despite of many promising applications, the structure of NBPT SAMs has not been characterized in detail. Here we present the first scanning tunnelling microscope study of NBPT SAMs on the technologically relevant Au(111) surfaces. The samples were prepared in solution and by vapour deposition in vacuum. We show that the structure of NBPT SAMs exhibits a complex polymorphic behaviour which strongly depends on the temperature and preparation details. We also discuss the observed reconstruction of the gold substrate.
[1] A. Gölzhäuser et al, Adv. Mater. 13 (2001) 806.
[2] A. Turchanin et al, Small 3 (2007) 2114.
[3] A. Turchanin et al, Adv. Mater. 20 (2008) 471.