Understanding Periodic Dislocations in 2D Supramolecular Crystals: The PFP/Ag(111) Interface
详细信息 查看全文
- 作者：E. Goiri ; J. M. Garc铆a-Lastra ; M. Corso ; Z. M. Adb El-Fattah ; J. E. Ortega ; D. G. de Oteyza
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：April 5, 2012
- 年：2012
- 卷：3
- 期：7
- 页码：848-852
- 全文大小：330K
- 年卷期：v.3,no.7(April 5, 2012)
- ISSN：1948-7185
文摘
In-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鈥搒ubstrate 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鈥搒ubstrate 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 moir茅.