On‐Surface Synthesis of NBN‐Doped Zigzag‐Edged Graphene Nanoribbons
Autor: | Hong-Jun Gao, Reinhard Berger, Yixuan Gao, Hongliang Lu, Shixuan Du, Huan Yang, Junzhi Liu, Zhihai Cheng, Yubin Fu, Xinliang Feng, Li Huang |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Scanning tunneling spectroscopy 010402 general chemistry 01 natural sciences Catalysis law.invention Gapless playback law NBN doping on-surface synthesis business.industry 010405 organic chemistry Communication Doping General Chemistry General Medicine Communications Graphene Nanoribbons 0104 chemical sciences Zigzag Polymerization radical cations zigzag edges Optoelectronics Density functional theory Scanning tunneling microscope business Graphene nanoribbons |
Zdroj: | Angewandte Chemie International Edition Angewandte Chemie Angewandte Chemie (International Ed. in English) |
ISSN: | 1521-3757 0044-8249 |
Popis: | We report the first bottom‐up synthesis of NBN‐doped zigzag‐edged GNRs (NBN‐ZGNR1 and NBN‐ZGNR2) through surface‐assisted polymerization and cyclodehydrogenation based on two U‐shaped molecular precursors with an NBN unit preinstalled at the zigzag edge. The resultant zigzag‐edge topologies of GNRs are elucidated by high‐resolution scanning tunneling microscopy (STM) in combination with noncontact atomic force microscopy (nc‐AFM). Scanning tunneling spectroscopy (STS) measurements and density functional theory (DFT) calculations reveal that the electronic structures of NBN‐ZGNR1 and NBN‐ZGNR2 are significantly different from those of their corresponding pristine fully‐carbon‐based ZGNRs. Additionally, DFT calculations predict that the electronic structures of NBN‐ZGNRs can be further tailored to be gapless and metallic through one‐electron oxidation of each NBN unit into the corresponding radical cations. This work reported herein provides a feasible strategy for the synthesis of GNRs with stable zigzag edges yet tunable electronic properties. Close to the edge: Two novel NBN‐doped zigzag‐edged graphene nanoribbons (ZGNRs) are derived through surface‐assisted synthesis. Experiments and calculations reveal the importance of the NBN units in modulating the electronic structures of the ZGNRs. Moreover, theoretical calculations predict that the electronic structures of NBN‐ZGNRs can be further tailored through one‐electron oxidation of each NBN unit into the corresponding radical cations. |
Databáze: | OpenAIRE |
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