Effects of surfactant and boron doping on the BWF feature in the Raman spectrum of single-wall carbon nanotube aqueous dispersions
Article Abstract:
The Breit-Wigner-Fano (BWF) line shape in the Raman spectra of carbon single-wall nanotubes (SWNTs) dispersed in aqueous suspensions is examined and the bundling and electronic effects are studied by comparing undoped SWNTs to boron-doped nanotubes (B-SWNTs) in different surfactant solutions. The results have suggested that the presence and intensity of the BWF feature is sensitive to any changes in the magnitude of dielectric screening, whether from tube-tube interactions in bundles, from charge injection or depletion, or from charge polarization from tube-molecule interactions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Kinetics of PL quenching during single-walled carbon nanotube rebundling and diameter-dependent surfactant interactions
Article Abstract:
Photoluminescence (PL) spectroscopy is used to investigate the kinetics of single-walled carbon nanotube (SWNT) rebundling and diameter-dependent surfactant interactions. The results have demonstrated that surfactant desorption from suspended nanotubes is rate-limiting in the rebundling process and that the PL quenching due to bonding is first-order in the concentration of luminescent nanotubes.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Experimental Gibbs free energy considerations in the nucleation and growth of single-walled carbon nanotubes
Article Abstract:
The reaction parameters to provide increasing excess driving force relative to the equilibrium conditions expected for the methane/hydrogen/graphite system based on tabulated Gibbs free energy data is presented. An upper bound for the Gibbs free energy of formation DeltaGf(T) for bulk SWNT, describing the formation of such an intermediate species such as chemisorbed carbon atoms is presented.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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