NCAFM2023 Programme Booklet

ELECTRONIC COUPLING MECHANISM OF ON SURFACE SYNTHESIZED ZIGZAG EDGED GRAPHENE NANORIBBON WITH SUBSTRATE

Shaotang Song, Yu Teng, Yuanyuan He, Jiong Lu*

Department of Chemistry, National University of Singapore, 117543 Singapore Email: songs@nus.edu.sg

Recent advances in the field of on-surface synthesis have led to the creation of magnetic graphene nanostructures with spin-polarized edge states. These structures, including [n]triangulenes, [n]rhombenes, Clar's goblet, and zigzag-edged graphene nanoribbons (zGNRs), have been the subject of extensive research due to their potential applications in spintronics and nanoelectronics. Among these structures, zigzag-edged graphene nanoribbons (zGNRs) are particularly noteworthy due to their strong coupling to Au(111) surfaces, which hinder investigation of their electronic properties. However, the coupling mechanism is remained elusive. This poster presentation will showcase the on-surface synthesis of a nitrogen-symmetrically doped zGNR and discuss the mechanism by which zGNRs are coupled to substrates using non-contact atomic force microscopy, Kelvin probe force microscopy, and density functional theory calculations. Additionally, we will explore the tip-induced decoupling mechanism of zGNRs, which has important implications for their potential use for fabricating electronic devices in the future.

Fig. nc-AFM image of nitrogen-symmetrically-doped GNR.

References [1] Pascal Ruffieux, Shiyong Wang, Bo Yang, Carlos Sánchez-Sánchez, Jia Liu, Thomas Dienel, Leopold Talirz, Prashant Shinde, Carlo A. Pignedoli, Daniele Passerone, Tim Dumslaff, Xinliang Feng, Klaus Müllen & Roman Fasel, Nature 2016, 531 , 489–492 [2] Blackwell, R. E.; Zhao, F.; Brooks, E.; Zhu, J.; Piskun, I.; Wang, S.; Delgado, A.; Lee, Y.-L.; Louie, S. G.; Fischer, F. R. Nature 2021, 600 , 647-652

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