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    Structural properties of carbon nanotubes derived from 13C NMR

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    PhysRevB.84.165417.pdf
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    Type
    Article
    Authors
    Abou-Hamad, Edy
    Babaa, M.-R.
    Bouhrara, Mohamed
    Kim, Y.
    Saih, Youssef
    Dennler, S.
    Mauri, F.
    Basset, Jean-Marie cc
    Goze-Bac, C. cc
    Wågberg, T.
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2011-10-10
    Permanent link to this record
    http://hdl.handle.net/10754/552994
    
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    Abstract
    We present a detailed experimental and theoretical study on how structural properties of carbon nanotubes can be derived from 13C NMR investigations. Magic angle spinning solid state NMR experiments have been performed on single- and multiwalled carbon nanotubes with diameters in the range from 0.7 to 100 nm and with number of walls from 1 to 90. We provide models on how diameter and the number of nanotube walls influence NMR linewidth and line position. Both models are supported by theoretical calculations. Increasing the diameter D, from the smallest investigated nanotube, which in our study corresponds to the inner nanotube of a double-walled tube to the largest studied diameter, corresponding to large multiwalled nanotubes, leads to a 23.5 ppm diamagnetic shift of the isotropic NMR line position δ. We show that the isotropic line follows the relation δ = 18.3/D + 102.5 ppm, where D is the diameter of the tube and NMR line position δ is relative to tetramethylsilane. The relation asymptotically tends to approach the line position expected in graphene. A characteristic broadening of the line shape is observed with the increasing number of walls. This feature can be rationalized by an isotropic shift distribution originating from different diamagnetic shielding of the encapsulated nanotubes together with a heterogeneity of the samples. Based on our results, NMR is shown to be a nondestructive spectroscopic method that can be used as a complementary method to, for example, transmission electron microscopy to obtain structural information for carbon nanotubes, especially bulk samples.
    Citation
    Structural properties of carbon nanotubes derived from 13C NMR, 2011, 84 (16) Physical Review B
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.84.165417
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.84.165417
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.84.165417
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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