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Title: Phenyl Functionalization of Atomically Precise Graphene Nanoribbons for Engineering Inter-ribbon Interactions and Graphene Nanopores

Journal Article · · ACS Nano

Graphene nanoribbons (GNRs) attract a great attention from researchers due to their tunable physical properties and potential for becoming nanoscale building blocks of electronic devices. GNRs can be synthesized with atomic precision by on-surface approaches from specially designed molecular precursors. While a considerable number of ribbons with very diverse structures and properties have been demonstrated in recent years, there have been only limited examples of on-surface synthesized GNRs modified with functional groups. In this study, we designed a nanoribbon, in which the chevron GNR backbone is decorated with phenyl functionalities, and demonstrate the on-surface synthesis of these GNRs on Au(111). We show that the phenyl modification affects the assembly of the GNR polymer precursors through π-π interactions. Scanning tunneling spectroscopy of the modified GNRs on Au(111) revealed that they have a band gap of 2.50±0.02 eV, which is comparable to that of the parent chevron GNR. The phenyl functionalization leads to a shift of the band edges to lower energies, suggesting that it could be a useful tool for the GNR band structure engineering. We also investigated lateral fusion of the phenyl-modified GNRs and demonstrate that it could be used to engineer different kinds of atomically precise graphene nanopores. A similar functionalization approach could be potentially applied to other GNRs to affect their on-surface assembly, modify their electronic properties, and realize graphene nanopores with a variety of structures.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1466610
Report Number(s):
BNL-207943-2018-JAAM
Journal Information:
ACS Nano, Vol. 12, Issue 8; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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A stretchable laminated GNRs/BNNSs nanocomposite with high electrical and thermal conductivity journal January 2019
Modified Engineering of Graphene Nanoribbons Prepared via On‐Surface Synthesis journal December 2019
On‐Surface Synthesis and Spectroscopic Characterization of Laterally Extended Chevron Graphene Nanoribbons journal June 2019
The qPlus sensor, a powerful core for the atomic force microscope journal January 2019
Controlling a Chemical Coupling Reaction on a Surface: Tools and Strategies for On-Surface Synthesis journal March 2019
Bottom-up Assembly of Nanoporous Graphene with Emergent Electronic States journal July 2020