Kawai, Shigeki - National Institute for Materials Science -

研究领域

Research topics: On-Surface Chemistry with High-Resolution STM/AFM We are studying molecules adsorbed on surfaces at a single molecular level with scanning tunnelling microscopy (STM) and atomic force microscopy (AFM) under ultra-high vacuum at low-temperature. The functionalized tip apex with a small molecule or a noble gas atom allows direct visualization of the inner structures of single molecules on surface. It is not exaggeration that this advanced measurement and characterization in STM/AFM provides a major turning point in chemistry. For instance, we can conduct single molecule chemistry, in which (i) we first observe an inner structure of a single molecule on surface, (ii) modify the structure by the tunneling current and/or by contacting another atom/molecule at the reactive part, and (iii) identify the structure of the product. This reaction allows us to synthesize novel compounds, which have been challenging in solution base chemistry. We strongly believe that this on-surface chemistry with high-resolution STM/AFM becomes an important section of chemistry. Besides exploring the basic science, tip-induced and/or thermal on-surface reaction lead to syntheses of novel nanocarbon material such as graphene nanoribbons, which are expected to be a key element in nano-electronics and spintronics. For instance, various applications such as gas sensor, magnetic head, light emitter/detected, switch, electrostatic capacitor, and superlubricity interface can be considered. We wish that our scientific research with STM/AFM develops on-surface chemistry and consequently realizes nanocarbon based devices. We are also developing new instruments and measurement techniques, which are of importance to proceed our studies.

近期论文

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K. Sun, O. J. Silveira, Y. Ma, Y. Hasegawa, M. Matsumoto, S. Kera, O. Krejčí, A. S. Foster, S. Kawai "On-Surface Synthesis of Disilabenzene-Bridged Covalent Organic Frameworks" Nature Chemistry 2022. S. Kawai, K. Sugawara, Y. Ma, K. Sun, O. Custance, Y. Ishigaki, T. Suzuki "Multiple Molecular Interactions between Alkyl Groups and Dissociated Bromine Atoms on Ag(111)"Phys. Chem. Chem. Phys. 2022, 24, 22191–22197. K. Sun, O. J. Silveira, S. Saito, K. Sagisaka, S. Yamaguchi, A. S. Foster, S. Kawai "Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons" ACS Nano 2022, 16, 11244–11250. S. Kawai, A. Ishikawa, S. Ishida, T. Yamakado, Y. Ma, K. Sun, Y. Tateyama, R. Pawlak, E. Meyer, S. Saito, A. Osuka "On-Surface Synthesis of Porphyrin-Complex Multi-Block Co-Oligomers by Defluorinative Coupling" Angew. Chem. Int. Ed. 2022, 61, e202114697. S. Kawai, M. A. Kher-Elden, A. Sadeghi, Z. M. Abd El-Fattah, K. Sun, S. Izumi, S. Minakata, Y. Takeda, J. Lobo-Checa "Near Fermi Superatom State Stabilized by Surface State Resonances in a Multiporous Molecular Network" Nano Lett. 2021, 21, 6456-6462. K. Sun, K. Sagisaka, L. Peng, H. Watanabe, F. Xu, R. Pawlak, E. Meyer, Y. Okuda, A. Orita, S. Kawai "Head-to-Tail Oligomerization by Silylene-tethered Sonogashira Coupling on Ag(111)" Angew. Chem. Int. Ed. 2021, 60, 19598-19603. K. Sun, K. Sugawara, A. Lyalin, Y. Ishigaki, K. Uosaki, T. Taketsugu, T. Suzuki, S. Kawai "Heterocyclic Ring Opening of Nanographene on Au(111)" Angew. Chem. Int. Ed. 2021, 60, 9427-9432. K. Sun, S. Kawai "Strength of Electronic Decoupling of Fullerene on an AuSiX Layer Formed on Au(111)" Phys. Chem. Chem. Phys. 2021, 23, 5455-5459. K. Sun, T. Nishiuchi, K. Sahara, T. Kubo, A. S. Foster, S. Kawai "Low-Temperature Removal of Dissociated Bromine by Silicon Atoms for an On-Surface Ullmann Reaction" J. Phys. Chem. C 2020, 124, 19675–19680. K. Nakamura, Q.-Q. Li, O. Krejci, A. S. Foster, K. Sun, S. Kawai, S. Ito "On-Surface Synthesis of a π-Extended Diaza[8]circulene" J. Am Chem. Soc. 2020, 142, 11363-11369. S. Kawai, H. Sang, L. Kantorovich, K. Takahashi, K. Nozaki, S. Ito "An Endergonic Synthesis of Single Sondheimer-Wong Diyne by Local Probe Chemistry" Angew. Chem. Int. Ed. 2020, 59, 10842-10847. S. Kawai, O. Krejčí, T. Nishiuchi, K. Sahara, T. Kodama, R. Pawlak, E. Meyer, T. Kubo, A. S. Foster "Three-Dimensional Graphene Nanoribbons as a Framework for Molecular Assembly and Local Probe Chemistry" Science Advances 2020, 6, eaay8913. L. Talirz, H. Söde, S. Kawai, P. Ruffieux, E. Meyer, X. Feng, K. Müllen, R. Fasel, C. A. Pignedoli, D. Passerone "Band Gap of Atomically Precise Graphene Nanoribbons as a Function of Ribbon Length and Termination" ChemPhysChem 2019, 20, 2348-2353. K. Sun, O. Krejči, A. S. Foster, Y. Okuda, A. Orita, S. Kawai "Synthesis of Regioisomeric Graphene Nanoribbon Junctions via Heteroprecursors" J. Phys. Chem. C 2019, 123, 17632-17638. I. Piquero-Zulaica, Z. Abd El-Fattah, O. Popova, S. Kawai, S. Nowakowska, M. Matena, M. Enache, M. Stöhr, A. Tejeda, A. Taleb-Ibrahimi, E. Meyer, J. Ortega, L. Gade, T. Jung, J. Lobo-Checa "Effective Determination of Surface Potential Landscapes from Metal-Organic Nanoporous Network Overlayers" New J. Phys. 2019, 21, 053004. S. Fremy-Koch, A. Sadeghi, R. Pawlak, S. Kawai, A. Baratoff, S. Goedecker, E. Meyer, T. Glatzel "Controlled Switching of a Single CuPc Molecule on Cu(111) at Low Temperature" Phys. Rev. B 2019, 100, 155427. L. Gigli, S. Kawai, R. Guerra, N. Manini, R. Pawlak, X. Feng, K. Müllen, P. Ruffieux, R. Fasel, E. Tosatti, E. Meyer, A. Vanossi "Detachment Dynamics of Graphene Nanoribbons on Gold" ACS Nano 2019, 13, 689-697. S. Kawai, O. Krejčí, A. S. Foster, R. Pawlak, F. Xu, L. Peng, A. Orita, E. Meyer "Diacetylene Linked Anthracene Oligomer Synthesized by One-Shot Homo-Coupling of Trimethylsilyl on Cu(111)" ACS Nano 2018, 12, 8791-8797. E. Carbonel-Sanroma, A. Garcia-Lekue, M. Corso, G. Vasseur, P. Brandimarte, J. Lobo, D. G. de Oteyza, J. Li, S. Kawai, S. Saito, S, Yamaguchi, J. E. Ortega, D. Sanchez-Portal, J. I. Pascual "Electronic Properties of Substitutionally Boron-Doped Graphene Nanoribbons on Au(111) Surface" J. Phys. Chem. C 2018, 122, 16092-16099. A. Vanossi, D. Dietzel, A. Schirmeisen, E. Meyer, R. Pawlak, T. Glatzel, M. Kisiel, S. Kawai, N. Manini "Recent Highlights in Nanoscale and Mesoscale Friction" Beilstein J. Nanotechnol. 2018, 9, 1995-2014.