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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.7: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
EC-STM investigation of self-organized Porphyrin layers on an iodide-modified Au(111) surface — •Tomasz Kosmala1,2, Michael Schneider2, Aleksander Krupski1, and Klaus Wandelt1,2 — 1Institute of Experimental Physics, University Wroclaw, plac Maksa Borna 9, 50-204 Wrocław, Poland — 2Institute of Physical and Theoretical Chemistry, University Bonn, Wegelerstr. 12 , 53115 Bonn, Germany
The self-assembly of Tetra(N-methyl-4-pyridyl)-porphyrin molecules (TMPyP) on an iodide- modified Au(111) surface has been studied by means of Cyclic Voltametry (CV) and in-situ Electrochemical Scanning Tunneling Microscopy (EC-STM).
The iodine precovered Au(111) surface was found to be a good substrate for the self-assembly of highly ordered layers of porphyrin cations from solution [1,2].
Unlike the Itaya group [1,2], however, we have prepared the iodine precoverage on Au(111) in situ and found the iodine layer to be stable at potential even below the first reduction potential of adsorbed TMPyP. As a consequence we were able to monitor interesting structural phase transitions as a consequence of the molecular redox-processes, which could not be seen in the previous work [1,2].
[1] M. Kunitake, N. Batina, and K. Itaya, Langmuir, vol. 11, no. 7, pp. 2337 - 2340, (1995).
[2] M. Kunitake, U. Akiba, N. Batina, and K. Itaya, Langmuir, vol. 13, no. 6, pp. 1607 - 1615, (1997).