Effect of medium dielectric constant on the physical properties of single-walled carbon nanotubes

[Display omitted] ► We studied the properties of semiconducting SWNTs in different media. ► We found a redshift of the photoluminescence with the increase of the dielectric constant. ► The fluorescence efficiency of carbon nanotubes is depend on the chirality. The photophysical properties of semicon...

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Bibliographic Details
Published in:Chemical physics 2013-02, Vol.413, p.35-38
Main Authors: Gao, J., Gomulya, W., Loi, M.A.
Format: Article
Language:English
Subjects:
Carbon nanotube
Photophysics
Polymer-wrapped carbon nanotubes
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Summary:[Display omitted] ► We studied the properties of semiconducting SWNTs in different media. ► We found a redshift of the photoluminescence with the increase of the dielectric constant. ► The fluorescence efficiency of carbon nanotubes is depend on the chirality. The photophysical properties of semiconducting single walled carbon nanotubes (SWNTs) in different environments are analyzed by steady-state and time-resolved photoluminescence (PL) spectroscopy. The PL emission of SWNTs shows a red shift with the increase of the dielectric constant of the environments. The solvatochromic shift depends on the structural properties of the nanotubes and reaches almost 100 milli-electron volts in the case of (7,5) tubes. These experimental results allow deriving a relationship between the PL shift and the structure of SWNTs. Moreover, the dynamics of ‘bright’ excitons in semiconducting SWNTs and the effect of the medium on the decay of the excitons are discussed by using time-resolved spectroscopy.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2012.11.003