NanoMat Science Day 2021


The goal of this workshop is to foster discussion between scientists working in different groups in DESY Photon Science in the field of nano- and materials science (NanoMat). Synergies and common research interests can be identified and future collaborations established. The workshop covers in its three sessions main activities of NanoMat, such as Hierarchically structured materials under complex environments, Water in confinement and technology, as well as materials and x-ray methods for quantum computing. Each session will be introduced by NanoMat scientists reviewing the present research and future challenges in the corresponding fields. Postdocs and PhD students are strongly encouraged to submit proposals for talks and posters for the sessions. The program will be compiled by the session chairs. It is also open for interested guests from other DESY groups.

The 2021 event will be fully on-line, in the hope, that 2022 we can come back to an “in person” event!


Deadline for the submission of your contribution (title!): 25.1.2021



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        Heterogeneous Adsorption and Local Ordering of Formic Acid on a Magnetite Surface

        Magnetite (Fe$_3$O$_4$) is an important and diverse transition metal oxide with applications as a catalyst in various industrial processes such as the water-gas shift reaction [1]. Formic acid (HCOOH), as the elementary carboxylic acid, is proposed to occur as an intermediate during this reaction. In material science magnetite nanoparticles are linked by larger carboxylic acids to form supercrystals with exceptional mechanical properties [2]. Thus, a detailed atomic understanding of the interaction at the magnetite surface/carboxylic acid interface is vital. In this contribution the adsorption of formic acid on the magnetite (111) single crystal surface is studied under UHV conditions at room temperature. Our FT-IRRA spectroscopy results and DFT calculations show dissociative adsorption of formic acid in quasi-bidentate and chelating geometries, the latter being stabilized by the presence of tetrahedral iron vacancies at the surface. The locally observed $(\sqrt{3}\times\sqrt{3})\,$R 30$^\circ$ superstructure by STM consists of formate in a triangular arrangement, adsorbed predominantly in chelating geometry. This contribution will present results from experiments performed at the DESY NanoLab and the European Synchrotron Radiation Facility (ESRF).

        [1] M. Zhu et al., ACS Catalysis 6, 722-732 (2016)
        [2] A. Dreyer et al., Nature Materials 15, 522-528 (2016)

        Speaker: Dr CREUTZBURG, Marcus (FS-NL (Nanolab))