文献详情
On-Surface Synthesis of NBN-Doped Zigzag-Edged Graphene Nanoribbons
文献类型：期刊
期刊名称：Angewandte Chemie (International ed. in English)
年：2020
ISSN：1521-3773
关键词：Graphene Nanoribbons,NBN Doping,Zigzag Edges,on-surface synthesis,radical cations
摘要：On-surface synthesis of heteroatom-doped graphene nanoribbons (GNRs) represents an attractive strategy for the modulation of GNRs with tailor-made electronic properties. The rational bottom-up synthetic strategies used thus far for zigzag-edged GNRs (ZGNRs) are limited due to their highly unstable characteristics. We report herein the first bottom-up synthesis of nitrogen-boron-nitrogen (NBN)-doped zigzag-edged GNRs ( NBN-ZGNR1 and NBN-ZGNR2 ) through surface-assisted polymerization and cyclodeh ...More
On-surface synthesis of heteroatom-doped graphene nanoribbons (GNRs) represents an attractive strategy for the modulation of GNRs with tailor-made electronic properties. The rational bottom-up synthetic strategies used thus far for zigzag-edged GNRs (ZGNRs) are limited due to their highly unstable characteristics. We report herein the first bottom-up synthesis of nitrogen-boron-nitrogen (NBN)-doped zigzag-edged GNRs ( NBN-ZGNR1 and NBN-ZGNR2 ) through surface-assisted polymerization and cyclodehydrogenation based on two U-shaped molecular precursors ( M1 and M2 ) 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 (1.50 eV, 37% zigzag edge proportion) and NBN-ZGNR2 (0.90 eV, 57% zigzag edge proportion) are significantly different from those of their corresponding pristine fully carbon-based ZGNRs ( PCZGNR1 : 0.52 eV; PCZGNR2 : 0.27 eV). In addition, DFT calculations predict that the electronic structures of NBN-ZGNRs can be further tailored to be gapless (zero bandgap) and metallic, respectively, 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.? 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. ...Hide

DOI：10.1002/anie.202000488
百度学术：On-Surface Synthesis of NBN-Doped Zigzag-Edged Graphene Nanoribbons
语言：外文
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