1 Center for Basic Research on Materials, National Institute for Materials Science (NIMS)2 Department of Condensed Matter Theoretical Physics, Universidad Autonoma de Madrid, SpainFig. 1 STM image (Vsample = +2.0 V, Itunnel= 50 nA, scan area: 10 nm × 10 nm) of Fe3O4(111) exposed to water.Fig. 1 STM (a) and AFM (b) images of confined CO2 molecules between two PDI-Au chains.63After annealing the single crystal of Fe3O4(111) at 950 K and subsequently cooling it to room temperature, the water-exposed surface exhibited one type of bright spots, which can be attributed to dissociated water species. In contrast, when water exposure was performed while the surface was kept at room temperature for 1 hour after removal from the STM head at 79 K, three types of water-related species were observed (Fig. 1). One of these species (indicated by blue circles) represents a newly discovered type that has not been described in previous studies [1]. It is possible that the three types of bright spots include adsorbed species related not only to dissociated water but also to molecularly adsorbed water.[1] A. Kiuchi et al., Surf. Sci., 750, 122582 (2024). Poster Award NomineeP3-01Defect Identification at Confined CO2 Islands Using SPMOscar Custance1, Emiliano Ventura-Macias2, Hironobu Hayashi1, Tadakatsu Ohkubo1, Shigeki Kawai1, and Ruben Perez2Understanding how carbon dioxide (CO2) behaves and interacts with surfaces is paramount for the development of sensors and materials to attempt CO2 mitigation and catalysis. Here, we combine simultaneous AFM and STM to resolve the molecular structure of CO2 islands confined between one-dimensional metal−organic chains grown on a gold (111) surface and formed by PDI molecules linked by gold adatoms (Fig. 1). We have identified a chiral arrangement of flat CO2 molecules in a windmill structure that populates these islands and enclose standing CO2 molecules, CO molecules, and Au adatoms. Some of these defects are invisible to the STM and others are undetected by the AFM; only by simultaneously combining these two techniques it is possible to locate and identify all these defects. Our results show the complementarity of AFM and STM and their potential to explore greenhouse gas molecules at surface-supported model systems [1].[1] O. Custance et al., ACS Nano, 18, 26759-26769 (2024).P3-02Water Adsorption on the Magnetite Surface Studied by Scanning Tunneling MicroscopyTatsuhiro Hirai1, Keisuke Sagisaka2, and Tomoko K. Shimizu11 Department of Applied Physics and Physico-Informatics, Keio University2 Center for Basic Research on Materials, National Institute for Materials Science (NIMS)The study of gas adsorption on the magnetite (Fe3O4) surface is a key to understanding the mechanism of catalytic reactions. Scanning tunneling microscopy (STM) provides atomic-scale insights into surface phenomena involving adsorbed gas species. In this study, we investigate the Fe3O4(111) surface after exposure to water using ultrahigh-vacuum (UHV) STM at 79 K (LT).
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