Journal
ACS NANO
Volume 6, Issue 3, Pages 2649-2655Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300035y
Keywords
carbon nanotubes; luminescence; single-molecule spectroscopy; excitons; environmental effects; water filling
Categories
Funding
- Agence Nationale de la Recherche, Region Aquitaine
- French Ministry of Education and Research
- European Research Council
- Fund for Scientific Research Flanders, Belgium (FWO-Vlaanderen) [G.0129.07, G.0400.11, G.0211.12]
- MEXT [20241023]
- Grants-in-Aid for Scientific Research [20241023] Funding Source: KAKEN
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The influence of water filling on the photoluminescence (PL) properties of SWCNTs is studied by ensemble and single-molecule PL spectroscopy. Red-shifted PL and PL excitation spectra are observed upon water filling for 16 chiralities and can be used to unambiguously distinguish empty SWCNTs from filled ones. The effect of water filling on the optical transitions is well-reproduced by a continuum dielectric constant model previously developed to describe the influence of the nanotube outer environment. Empty nanotubes display narrower luminescence lines and lower inhomogeneous broadening, signatures of reduced extrinsic perturbations. The radial breathing mode phonon sideband is clearly observed in the PL spectrum of small diameter empty tubes, and a strong exciton-phonon coupling is measured for this vibration. Biexponential PL decays are observed for empty and water-filled tubes, and only the short-living component is influenced by the water filling. This may be attributed to a shortening of the radiative lifetime of the bright state by the inner dielectric environment.
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