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My research concentrates on fundamental studies of the mechanisms of chemical reactions that occurs on the metals and metal oxides catalyst surfaces.
My current research at University of California, Riverside focuses on a surface science study of the chemistry of precursors used for atomic layer deposition (ALD) on solid surfaces. This includes the use of several techniques, including temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and reflection-absorption infrared spectroscopy (RAIRS), to investigate the mechanism of thermal decomposition of ALD precursors on model surfaces.
My research at the Institute of Materials Chemistry, Vienna University of Technology focused on the systematic design of Pt-, Pd- and Cu/Au based catalysts (with high activity, selectivity, and stability, as well as a lower noble metal content) based on quantitative correlations between atomic-scale surface features and catalytic activity under realistic reaction conditions. To this end, well-defined model catalysts were prepared by growing monometallic and bimetallic nanoparticles on carbon supports (e.g. highly oriented pyrolytic graphite (HOPG)) in ultra-high vacuum (UHV). After preparation of the model catalysts in UHV conditions, scanning tunneling microscopy (STM) was used to reveal size, shape and height of metal nanoparticles (hence the total number of atoms on the model catalyst can be calculated) and X-ray photoelectron spectroscopy (XPS) was used to determine the composition, oxidation state, as well as metal/metal oxide coverage of the model catalysts. The catalytic properties of the model catalysts were examined as a function of size, shape and composition of nanoparticles in a UHV-compatible microreactor setup under atmospheric pressure (batch and flow mode), as well as gas-phase reactants/products were analyzed by mass spectrometry (MS) and gas chromatography (GC).
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Thin Solid Films (2023): 139716-139716
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