Phenyl functionalization of atomically precise graphene nanoribbons for engineering inter-ribbon interactions and graphene nanopores

Mikhail Shekhirev, Percy Zahl, Alexander Sinitskii

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Graphene nanoribbons (GNRs) attract much 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 I 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.

Original languageEnglish (US)
Pages (from-to)8662-8669
Number of pages8
JournalACS Nano
Volume12
Issue number8
DOIs
StatePublished - Aug 28 2018

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Nanoribbons
Carbon Nanotubes
Nanopores
Graphite
Graphene
ribbons
graphene
engineering
interactions
assembly
electronics
Electronic properties
Band structure
Functional groups
engineers
Polymers

Keywords

  • bottom-up synthesis
  • electronic structure
  • functionalization
  • graphene nanopore
  • graphene nanoribbons
  • self-assembly

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Phenyl functionalization of atomically precise graphene nanoribbons for engineering inter-ribbon interactions and graphene nanopores. / Shekhirev, Mikhail; Zahl, Percy; Sinitskii, Alexander.

In: ACS Nano, Vol. 12, No. 8, 28.08.2018, p. 8662-8669.

Research output: Contribution to journalArticle

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