Abstract Kazu Suenaga was born in Osaka in 1966. He got his Ph.D in Materials Science at the University of Tokyo in 1994. He was a postdoctoral fellow at Ecole Nationale Superieure des Mine de Paris (1994-1997) and at the Solid State Physics Laboratory in the University Paris-Sud (1997-1998). Then he joined the Japan Science and Technology Corporation (JST) as a researcher (1998-2001), National Institute of Advanced Industrial Science and Technology (AIST) (2001-2021) as a prime senior researcher, and is now a distinguished professor in Osaka University (since 2021).25Electron microscopy and spectroscopy are widely used to characterize various low-dimensional materials. Identifying the atomic structures and/or measurements of local optical properties are of great importance in designing nanoscale devices based on hybrid nanostructures. Electron energy-loss spectroscopy (EELS) has been widely used for elemental identification at the single-atom limit in transmission electron microscopes (TEM) by using core-level excitations. Recent developments of monochromators after the e-beam guns have enabled us to access optical and vibrational information from the valence EELS ranges of nanometric materials with high-spatial/energy resolution. Here we show our latest studies to demonstrate the possibilities of EELS applied for low-dimensional materials. Examples for atomic defects in in-plane hybrid TMDCs, monolayer structures of metal chlorides intercalated in bi-layer graphene, surface adatoms for catalysis, two-dimensional iodine-monofluoride epitaxy, and isotopically heterogeneous graphene will be shown.[1] Y.-C. Lin et al., Adv. Mater., article number 2007819 (2021).[2] Y.-C. Lin et al., Adv. Mater., article number 2105898 (2021).[3] Y.-C. Lin et al., Nano Lett., 21, 10386-10391 (2021).[4] G. Liu et al., Nature Chem., 810-816 (2017).[5] S. Wu et al., J. Am. Chem. Soc., 143, 9105-9112 (2021).[6] R. Senga et al. Nature, 603, 68-72 (2022).[7] The works presented here are supported by JST-CREST and ERC MORE-TEM projects.Distinguished professor, Osaka University Single-atom Spectroscopy in Low-dimensional Materials Kazu Suenaga Invited Talk: S1-2
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