TY - JOUR
T1 - NMR strategies to study the local magnetic properties of carbon nanotubes
AU - Abou-Hamad, Edy
AU - Kim, Younghyun
AU - Bouhrara, Mohamed
AU - Saih, Youssef
AU - Wågberg, Thomas
AU - Luzzi, David E.
AU - Goze-Bac, Christophe
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2012/2
Y1 - 2012/2
N2 - The local magnetic properties of the one dimensional inner space of the nanotubes are investigated using 13C nuclear magnetic resonance spectroscopy of encapsulated fullerene molecules inside single walled carbon nanotubes. Isotope engineering and magnetically purified nanotubes have been advantageously used on our study to discriminate between the different diamagnetic and paramagnetic shifts of the resonances. Ring currents originating from the π electrons circulating on the nanotube, are found to actively screen the applied magnetic field by -36.9 ppm. Defects and holes in the nanotube walls cancel this screening locally. What is interesting, that at high magnetic fields, the modifications of the NMR resonances of the molecules from free to encapsulated can be exploited to determine some structural characteristics of the surrounding nanotubes, never observed experimentally. © 2011 Elsevier B.V. All rights reserved.
AB - The local magnetic properties of the one dimensional inner space of the nanotubes are investigated using 13C nuclear magnetic resonance spectroscopy of encapsulated fullerene molecules inside single walled carbon nanotubes. Isotope engineering and magnetically purified nanotubes have been advantageously used on our study to discriminate between the different diamagnetic and paramagnetic shifts of the resonances. Ring currents originating from the π electrons circulating on the nanotube, are found to actively screen the applied magnetic field by -36.9 ppm. Defects and holes in the nanotube walls cancel this screening locally. What is interesting, that at high magnetic fields, the modifications of the NMR resonances of the molecules from free to encapsulated can be exploited to determine some structural characteristics of the surrounding nanotubes, never observed experimentally. © 2011 Elsevier B.V. All rights reserved.
UR - http://hdl.handle.net/10754/562074
UR - https://linkinghub.elsevier.com/retrieve/pii/S0921452611011987
UR - http://www.scopus.com/inward/record.url?scp=84855894597&partnerID=8YFLogxK
U2 - 10.1016/j.physb.2011.12.012
DO - 10.1016/j.physb.2011.12.012
M3 - Article
SN - 0921-4526
VL - 407
SP - 740
EP - 742
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 4
ER -