Journal
SURFACE SCIENCE
Volume 601, Issue 18, Pages 3984-3987Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2007.04.068
Keywords
STM; molecular assembly; diffusion; phase transition
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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(111) 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. (C) 2007 Elsevier B.V. All rights reserved.
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