Structural properties of carbon nanotubes derived from 13C NMR

Abou-Hamad, Edy and Babaa, Moualy Rachid and Bouhrara, Mohamed and Kim, Y and Saih, Youssef and Dennler, Samuel and Mauri, Fabrizio and Basset, Jean-Marie and Goze-Bac, Christophe and Wagberg, Thomas (2011) Structural properties of carbon nanotubes derived from 13C NMR. PHYSICAL REVIEW B (Impact Factor: 3.772), 84 . 165417-1-165417-6. ISSN 1098-0121 (print) 1550-235X (online) 1538-4489 (CD-Rom)

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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.

Item Type:Article
Subjects:Q Science > QC Physics
Departments / MOR / COE:Departments > Chemical Engineering
ID Code:6675
Deposited By: Dr Moulay Rachid Babaa
Deposited On:21 Nov 2011 06:29
Last Modified:19 Jan 2017 08:23

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