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    Assessing Inhomogeneity in Sorted Samples of Single-Walled Carbon Nanotubes through Fluorescence and Variance Spectroscopy

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    Author
    Kadria-Vili, Yara; Sanchez, Stephen R.; Bachilo, Sergei M.; Weisman, R. Bruce
    Date
    2017
    Abstract
    Detailed spectroscopic analysis has been used to study the homogeneity of single-walled carbon nanotube fractions carefully prepared by nonlinear density gradient ultracentrifugation sorting. Two distinct colored bands containing (6,5) enantiomers were subdivided into several extracted fractions that were separately diluted with sodium cholate surfactant and characterized by fluorescence, absorption, and variance spectroscopy. Values were measured for emission and absorption peak positions, Stokes shifts, emission peak widths, and emissive quantum yields. In addition, variance data were used to find relative emission per nanotube and to plot covariance slices representing homogeneous emission spectra. It was found that emission from SWCNTs within the upper enantiomer band shifts to shorter wavelengths with increasing depth in the centrifuge tube. In the lower enantiomer band such spectral shifts were not observed, but the emissive quantum yields decreased with depth. Variance analysis revealed spectral differences among SWCNTs within the same fraction of the same band. It is concluded that current methods for density gradient ultracentrifugation sorting produce samples that retain measurable structural and spectral inhomogeneities.
    Citation
    Kadria-Vili, Yara, Sanchez, Stephen R., Bachilo, Sergei M., et al.. "Assessing Inhomogeneity in Sorted Samples of Single-Walled Carbon Nanotubes through Fluorescence and Variance Spectroscopy." ECS Journal of Solid State Science and Technology, 6, no. 6 (2017) The Electrochemical Society: M3097-M3102. http://dx.doi.org/10.1149/2.0171706jss.
    Published Version
    http://dx.doi.org/10.1149/2.0171706jss
    Keyword
    covariance; density gradient ultracentrifugation; enantiomers; separation; SWCNT
    Type
    Journal article
    Publisher
    The Electrochemical Society
    Citable link to this page
    https://hdl.handle.net/1911/93863
    Rights
    This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License, which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.
    Link to License
    http://creativecommons.org/licenses/by/4.0/
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    • Chemistry Publications [636]
    • Faculty Publications [4988]
    • Materials Science and NanoEngineering Publications [352]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map