Length-dependent Raman spectroscopy of single-walled carbon nanotubes: the effect of dispersant on defects

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dc.creatorSimpson, J. R.
dc.creatorFagan, J. A.
dc.creatorBecker, M. L.
dc.creatorHobbie, E. K.
dc.creatorWalker, A. R. Hight
dc.date2008-11-02
dc.date.accessioned2026-07-07T10:14:49Z
dc.date.available2026-07-07T10:14:49Z
dc.descriptionWe compare Raman spectra from aqueous suspensions of length-separated single-walled carbon nanotubes (SWCNTs) dispersed using either polymer adsorption of single-stranded DNA or miscelle encapsulation with sodium deoxycholate surfactant. The Raman spectral features, other than the D-band, increase monotonically with nanotube length in both dispersion schemes. The intensity ratio of the disorder-induced D to G' Raman bands decays as a function of SWCNT length, proportional to 1/L, as expected for endcap defects. While the UV-vis absorption and fluorescence also increase with length for both dispersants, the fluorescence intensity is dramatically lower for DNA-wrapped SWCNTs of equal length. The similarities in the length-dependent D/G' ratios exclude defects as an explanation for the fluorescence decrease in DNA versus deoxycholate dispersions.
dc.description3 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0811.0180
dc.identifierhttp://arxiv.org/abs/0811.0180
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/173016
dc.subjectMaterials Science
dc.titleLength-dependent Raman spectroscopy of single-walled carbon nanotubes: the effect of dispersant on defects
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