title: Polymorphism in self-assembled structures of 9-anthracene carboxylic acid on Ag(111).
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.
authors: State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China.
authors: Chao
authors: C
authors: Lu
authors: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
authors: Yinying
authors: Y
authors: Wei
authors: State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China.
authors: Erkuang
authors: E
authors: Zhu
authors: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
authors: Janice E
authors: JE
authors: Reutt-Robey
authors: State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China.
authors: Bo
authors: 0000-0002-9804-1614
authors: B
authors: Xu
mesh_terms: D000327:Adsorption; D000873:Anthracenes / Q000737:chemistry*; D003460:Crystallization; D019281:Dimerization; D004563:Electrochemistry; D005740:Gases; D008670:Metals / Q000737:chemistry; D016252:Microscopy, Scanning Tunneling; D008968:Molecular Conformation; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry; D010316:Particle Size; D011868:Radioisotopes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000873:Anthracenes; D005740:Gases; D008670:Metals; D011868:Radioisotopes; D012834:Silver; C010030:9-anthroic acid