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Int. J. Mol. Sci. 2012, 13(6), 6836-6848; doi:10.3390/ijms13066836

Polymorphism in Self-Assembled Structures of 9-Anthracene Carboxylic Acid on Ag(111)

1 State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China 2 Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
* Author to whom correspondence should be addressed.
Received: 2 May 2012 / Revised: 23 May 2012 / Accepted: 29 May 2012 / Published: 5 June 2012
(This article belongs to the Special Issue Self-Assembled Soft Matter Nanostructures at Interfaces)
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Surface self-assembly process of 9-anthracene carboxylic acid (AnCA) on Ag(111) was investigated using STM. Depending on the molecular surface density, four spontaneously formed and one annealed AnCA ordered phases were observed, namely a straight belt phase, a zigzag double-belt phase, two simpler dimer phases, and a kagome phase. The two high-density belt phases possess large unit cells on the scale length of 10 nm, which are seldom observed in molecular self-assembled structures. This structural diversity stems from a complicated competition of different interactions of AnCA molecules on metal surface, including intermolecular and molecular-substrate interactions, as well as the steric demand from high molecular surface density.
Keywords: self-assembly; nanostructures; polymorphism; scanning tunneling microscopy self-assembly; nanostructures; polymorphism; scanning tunneling microscopy
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lu, C.; Wei, Y.; Zhu, E.; Reutt-Robey, J.E.; Xu, B. Polymorphism in Self-Assembled Structures of 9-Anthracene Carboxylic Acid on Ag(111). Int. J. Mol. Sci. 2012, 13, 6836-6848.

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