SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 97: Focus Session: Scanning Probe Microscopy with Quartz Sensors IV

O 97.4: Topical Talk

Friday, March 31, 2023, 11:15–11:45, TRE Ma

Heteroatom-substituted and three-dimensional nanocarbon materials studied with low temperature STM and qPlus AFM — •Shigeki Kawai — National Institute for Materials Science, Tsukuba, Japan

Since the first systematic on-surface covalent coupling of bromo-substituted porphyrins,[1] on-surface chemical synthesis has attracted tremendous interest of researchers. Combining with bond-resolved scanning probe microscopy (SPM) with the qPlus sensor, [2] this field has been rapidly developed. In this contribution, I will present our recent studies on on-surface chemistry with high-resolution SPM operating at low temperature under ultra-high vacuum. We synthesized heteroatom doped [3] and three-dimensional graphene nanoribbons (GNRs) by coupling bromo substituted-propellane molecules on Au(111).[4] In the 3D-GNR, the C-Br bonds distant from the surface remained intact even after the reaction. The radical species were formed by tip-induced debromination and were also stabilized by either Br atom or fullerene molecule. We also developed new on-surface reaction, which can synthesize graphene nanoribbon and covalent organic frameworks with silabenzene units by coupling Si atom and Br-substituted molecule.[5]

Reference: [1] L. Grill, et al., Nat. Nanotechnol. 2, 687. (2007). [2] L. Gross, F. Mohn, N. Moll, P. Lilkeroth, G. Meyer, Science 325, 1110 (2009). [3] S. Kawai, et al Nat. Commun. 6, 8098 (2015) and Sci. Adv. 4, eaar7181 (2018). [4] S. Kawai, et al Sci. Adv. 6, eaay8913 (2020). [5] K. Sun et al, Nat. Chem. (2022) doi:10.1038/s41557-022-01071-3.