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

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

1
,
2
,
1
,
2
 and
1,*
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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Abstract

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 3.0).

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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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