Journal
ACS NANO
Volume 9, Issue 5, Pages 5034-5040Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn507408m
Keywords
graphene nanoribbons; single-wall carbon nanotubes; functionalization; optical absorption
Categories
Funding
- MEXT, Japan [22225001, 24750180, 26107530]
- JSPS
- IGER program
- CREST-JST
- MEXT KAKENHI Science of Atomic Layers [25107003]
- JST Research Acceleration Program
- Nagoya University G30 program
- Grants-in-Aid for Scientific Research [15K21073, 25107003, 26107530, 25107002, 24750180, 25887029, 26410013] Funding Source: KAKEN
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Nanotemplated growth of graphene nanoribbons (GNRs) inside carbon nanotubes is a promising mean to fabricate ultrathin ribbons with desired side edge configuration. We report the optical properties of the GNRs formed in single-wall carbon nanotubes. When coronene is used as the precursor, extended GNRs are grown via a high-temperature annealing at 700 degrees C. Their optical responses are probed through the diazonium-based side-wall functionalization, which effectively suppresses the excitonic absorption peaks of the nanotubes without damaging the inner GNRs. Differential absorption spectra clearly show two distinct peaks around 1.5 and 3.4 eV. These peaks are assigned to the optical transitions between the van Hove singularities in the density of state of the GNRs in qualitative agreement with the first-principles calculations. Resonance Raman spectra and transmission electron microscope observations also support the formation of long GNRs.
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