COLL 561 |
| Aromatic molecular film architecture is of intense fundamental and technological interest. We report first on the structure and evolution of single-component films of related anthracene- and acridine- derivatives. We show how slow physical vapor deposition (~ 0.1 ML/s) at room temperature on Ag(111) yields molecular films with near-equilibrium structures. We report coverage-dependent 2-D phase diagrams for acridine-carboxylic acid and anthracene-carbonitrile, as obtained from STM images. We present structural models for all ordered phases and corroborate these structural models with IRRAS and XPS spectroscopy. We then describe how rapid vapor deposition (>10 ML/s) yields metastable films structures. In the case of anthranoic acid (AA), metastable phases undergo 2-D phase transformations to yield more stable phases, as monitored with time-lapsed STM. Finally, we demonstrate how equilibrium 2-D phases of single-component molecular films can be harnessed to fabricate novel binary molecular films structures. In particular, we fabricate robust C60-ACA films with either chiral C60-ACA or chain-C60 arrangements, as directed by the predeposited ACA 2-D phase. |
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Dynamics of Single Atoms, Molecules and Clusters on Surfaces
8:30 AM-11:30 AM, Thursday, 14 September 2006 Sir Francis Drake -- Renaissance Room, Oral
Division of Colloid & Surface Chemistry |