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Understanding periodic dislocations in 2D supramolecular crystals: The PFP/Ag(111) interface

AuthorsGoiri, Elizabeth ; García-Lastra, J. M.; Corso, Martina ; Abd El-Fattah, Z. M. ; Ortega, J. Enrique ; Oteyza, D. G. de
Issue Date2012
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry Letters 3(7): 848-852 (2012)
AbstractIn-plane dislocation networks arise in both inorganic and organic films as a way of relieving the elastic strain that builds up at the substrate interface. In molecule/surface systems, supramolecular interactions are weak and more complex (compared to the atomic bonds in inorganic films), and their interplay with molecule-substrate interactions is very subtle, making it difficult to single out the driving force for a nanoscale dislocation pattern. On the basis of a combined experimental and theoretical work, we here show that periodic dislocations in a molecular PFP film are mainly driven by the optimization of molecule-substrate interactions. Compared to inorganic networks however, it implies a much lower energy imbalance, allowing a thermally induced transition from a low-energy strain dislocation pattern to a high-energy incommensurate moiré. © 2012 American Chemical Society.
Identifiersdoi: 10.1021/jz300051d
e-issn: 1948-7185
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