Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 13: Polymeric biomolecular films
O 13.5: Talk
Monday, March 26, 2012, 17:00–17:15, MA 005
Controlling on-surface polymerization by hierarchical and substrate-directed growth — •Leif Lafferentz1, Volker Eberhardt2, Carlo Dri3, Christina Africh3, Giovanni Comelli3, Friedrich Esch3, Stefan Hecht2, and Leonhard Grill1 — 1Fritz-Haber-Institut der MPG, Berlin, Germany — 2Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany — 3IOM-CNR Laboratorio TASC, Basovizza-Trieste, Italy
The on-surface synthesis of oligomers under ultra-high vacuum conditions has been intensely studied in the last years [1,2] as such processes allow the formation of stable covalently bound molecular structures on surfaces. However, so far all experiments relied on a one-step polymerization, which limits the control of the process and leads to rather simple architectures. Another issue that needs to be addressed is the reduction of defects, because covalent linking processes are typically irreversible and therefore lack a capability for self-repair. We present experiments that address these issues by employing a sequential connecting process, which achieves greater control of the network formation and reduces the number of defects. This novel approach opens the possibility for the formation of more sophisticated structures.
[1] Grill, L. et al. Nat. Nanotechnol. 2, 687-691 (2007)
[2] Gourdon, A. Angew. Chem.-Int. Edit. 47, 6950-6953 (2008)