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O: Fachverband Oberflächenphysik
O 64: Metal substrates: Adsorption of inorganic molecules
O 64.5: Talk
Friday, March 27, 2009, 12:15–12:30, SCH A215
Ordered Iodine Adsorption as Fingerprint of (111) Orientation of Pt Thin Films — •Björn Braunschweig, Alexej Mitin, and Winfried Daum — Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstrasse 4, D-38678 Clausthal-Zellerfeld
Well-ordered Pt films deposited on re-usable substrates find applications such as inexpensive replacements for bulk single crystals or ultrathin transparent electrodes for spectro-electrochemical applications. While morphological properties of such films - roughness, atomic steps and spatial extent of atomically flat terraces - are easily imaged with the STM, atomic resolution of the Pt surface is often not attainable under environmental conditions. We demonstrate that the atomic surface structure of (111)-oriented Pt thin films deposited on α-Al2O3(0001) substrates is clearly revealed after adsorption of ordered iodine adlayers. In comparative STM studies with Pt thin films and with (111)-oriented bulk single crystals we observed the same coexisting (4 ×3√3) and (√43×√43) iodine superstructures which indicates that our Pt films are highly ordered and (111)-oriented.