Real-time STM observation of molecular dynamics on a metal surface |
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Authors: | Yutaka Wakayama Jonathan P. Hill |
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Affiliation: | a Advanced Electronic Materials Centre, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan b Nanoscale Quantum Conductor Array Project, ICORP, JST, 1-1 Namiki, Tsukuba 305-0044, Japan c Supermolecular Group, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan |
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Abstract: | Dynamic processes of molecular assembly on a metal surface were examined using scanning tunneling microscopy (STM). Molecules of a porphyrin derivative were deposited on a Cu(1 1 1) surface and were found to be highly mobile at room temperature. The real-time STM observation enabled visualization of molecular activity such as surface diffusion, domain formation and phase transition. The high mobility of the molecules caused build-up and break-down of molecular domains. Metastability of the molecular assembly caused various domain formations with different molecular alignments, including square and hexagonal motifs. A phase transition from a hexagonal to a square domain structure was successfully observed by sequential STM imaging. |
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Keywords: | STM Molecular assembly Diffusion Phase transition |
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