Thin Films

Thin Films

The activities of the group are centered around thin film catalyst models. Such models mimic relevant aspects of a real world catalysts, but have a reduced complexity. That allows us to understand catalytic processes in detail. Central activities of the group are the development of thin film preparation recipes and the study of thermal and electrocatalytic reactions at the thin film / gas or liquid interfaces.

Supported catalysts may be mimicked by deposition of metallic aggregates. Several surface-sensitive experimental methods (XPS, TPD, STEM, EELS, IR surface action spectroscopy) are applied under vacuum conditions and at elevated pressures.

Group Members

Dr. Earl Davis
Dr. Ane Etxebarria
Dr. Afshan Jamshaid
Dr. Yun Liu
Walter Wachsmann
 
Thin Films Research Group

Research

Scanning probe microscopy is applied to investigate surface structures. Sometimes also X-ray based structural methods or I/V-LEED structural analysis may be used.

SPM

Scanning probe microscopy is applied to investigate surface structures. Sometimes also X-ray based structural methods or I/V-LEED structural analysis may be used.

With XPS the elemental composition of the surface and the electronic structure of the surface atoms is investigated. This may also involve adsorbates and/or deposited aggregates.

XPS

With XPS the elemental composition of the surface and the electronic structure of the surface atoms is investigated. This may also involve adsorbates and/or deposited aggregates.

HREELS is a method for the study of vibrations and electronic excitations at the surface. It may also reveal relevant information about deposited aggregates and adsorbates. In this method electrons are scattered inelastically at a surface. Hereby the electrons suffer an energy loss which is the desired information.

HREELS

HREELS is a method for the study of vibrations and electronic excitations at the surface. It may also reveal relevant information about deposited aggregates and adsorbates. In this method electrons are scattered inelastically at a surface. Hereby the electrons suffer an energy loss which is the desired information.

Surface action spectroscopy is a newly developed vibrational method. The investigated surface is covered with weakly bound atoms (the messengers) which are desorbed when infrared radiation [coming from the free electron laser (FEL) of the Institute] excites a vibration of the surface.

Action Spectroscopy

Surface action spectroscopy is a newly developed vibrational method. The investigated surface is covered with weakly bound atoms (the messengers) which are desorbed when infrared radiation [coming from the free electron laser (FEL) of the Institute] excites a vibration of the surface.

Recent Publications

Giulia Berti, Earl Davis, Helmut Kuhlenbeck, and Hans-Joachim Freund, "Interaction of CO2 with well-ordered iron sulfide films on Au(111)," Surface Science 710, 121853 (2021).
Yun Liu, Yuman Peng, Matthias Naschitzki, Sandy Gewinner, Wieland Schöllkopf, Helmut Kuhlenbeck, Rossitza Pentcheva, and Beatriz Roldan Cuenya, "Surface oxygen Vacancies on Reduced Co3O4(100): Superoxide Formation and Ultra-Low-Temperature CO Oxidation," Angewandte Chemie International Edition 60 (30), 16514-16520 (2021).
Joachim Paier, Connie J. Nellin, Paul S. Bagus, Agata Plucienik, Helmut Kuhlenbeck, and Hans-Joachim Freund, "Electronic structure of reduced CeO2(111) surfaces interacting with hydrogen as revealed through electron energy loss spectroscopy in comparison with theoretical investigations," Journal of Electron Spectroscopy and Related Phenomena , 147088 (2021).
Yun Liu, Zongfang Wu, Helmut Kuhlenbeck, and Hans-Joachim Freund, "Surface Action Spectroscopy: A Review and a Perspective on a New Technique to Study Vibrations at Surfaces," The Chemical Record 20 (6), 1270-1283 (2021).
Hans-Joachim Freund, Markus Heyde, Helmut Kuhlenbeck, Niklas Nilius, Thomas Risse, Thomas Schmidt, Shamil K. Shaikhutdinov, and Martin Sterrer, "Chapter model systems in heterogeneous catalysis at the atomic level: a personal view," Science China Chemistry 63 (4), 426-447 (2020).

Talks

Kuhlenbeck, H.: High Resolution Electron Energy Loss Spectroscopy. IMPRS Fall Block Course 2019, Unifying Concepts in Spectroscopy, Berlin, Germany (2019)

Former Group Photos

Thin Films Research Group 2019
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