Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Scanning Probe Techniques and New Experimental Methods

O 71.11: Poster

Wednesday, March 9, 2016, 18:15–20:30, Poster A

Construction of a movable UHV chamber for in situ sample preparation of molecules on TiO2 — •Steffen Bornemann, Bernhard Spicher, and Martin Wenderoth — IV. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

TiO2 is an important material for chemical catalysis which e.g. can be applied in photocatalytic water splitting [1]. In order to investigate this system with different surface sensitive techniques, we have constructed a movable UHV chamber for in situ sample preparation of molecules on the TiO2(110) rutile surface. Samples can be transferred to different low temperature scanning tunneling microscopes as well as to an analysis chamber equipped with a low energy electron diffraction (LEED) and an Auger electron spectroscopy (AES) setup. TiO2 substrates can be prepared by direct current heating, by electron beam heating and by ion beam sputtering. The chamber is equipped with an external evaporator for molecule deposition from a liquid phase like methanol and with an electrospray deposition system for more complex, non-volatile molecules. Moreover, sub-monolayer of metals can be deposited from different electron-beam evaporators. After several cycles of sputtering and heating up to 600°C we could verify the 1x1 reconstruction of the clean TiO2(110) surface after in situ transferring the samples to the LEED setup [2]. Ex situ characterization by atomic force microscopy shows terraces connected by single and multiple atomic steps.

[1] M. Ni, M.K.H. Leung, D. Y.C. Leung, K. Sumathy, Renewable and Sustainable Energy Reviews 11, 401 (2007) [2] Hiroshi Onishi, Yasuhiro Iwasawa, Surface Science Letters 313, 783 (1994)