Molecular aggregation within self-ordered monolayers. |
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Authors: | Leo Gross Karl-Heinz Rieder André Gourdon Christian Joachim Francesca Moresco |
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Institution: | 1. IBM Zürich Research Laboratory, S?umerstr. 4, 8803 Rüschlikon, Switzerland, Fax: (+41)?1‐724‐896;2. Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimallee 14, 14195 Berlin, Germany;3. The Nanoscience Group, CEMES‐CNRS, 29 rue J. Marvig, P.O. Box 94347, 31055 Toulouse Cedex, France |
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Abstract: | The monolayer growth of pyrimido-pentaphenylbenzene (NPB) on Cu(111) is investigated by means of low-temperature scanning tunneling microscopy (LT-STM). The pyrimidine side group gives rise to a pronounced resonant tunneling state and, furthermore, affects molecular self-ordering. Different molecular aggregates are formed inside the hexagonal closed packed monolayer. A structure model for the monolayer is proposed and the temperature dependence of this self-ordering process is investigated by varying the preparation temperature between 270 and 370 K. The intermolecular bonding of the aggregates is demonstrated by STM manipulation experiments. Moreover, different aggregations of the molecules induce characteristic energy shifts in the resonant tunneling state, as revealed by means of scanning tunneling spectroscopy. |
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Keywords: | molecular aggregates monolayer nanomaterials scanning probe microscopy supramolecular chemistry |
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