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Properties of K,Rb-intercalated C 60 encapsulated inside carbon nanotubes called peapods derived from nuclear magnetic resonance

We present a detailed experimental study on how magnetic and electronic properties of Rb,K-intercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the... Full description

Journal Title: Journal of Applied Physics 21 September 2015, Vol.118(11)
Main Author: Mahfouz, R.
Other Authors: Bouhrara, M. , Kim, Y. , Wågberg, T. , Goze-Bac, C. , Abou-Hamad, E.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4931146
Link: http://dx.doi.org/10.1063/1.4931146
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recordid: aip_complete10.1063/1.4931146
title: Properties of K,Rb-intercalated C 60 encapsulated inside carbon nanotubes called peapods derived from nuclear magnetic resonance
format: Article
creator:
  • Mahfouz, R.
  • Bouhrara, M.
  • Kim, Y.
  • Wågberg, T.
  • Goze-Bac, C.
  • Abou-Hamad, E.
subjects:
  • Articles
ispartof: Journal of Applied Physics, 21 September 2015, Vol.118(11)
description: We present a detailed experimental study on how magnetic and electronic properties of Rb,K-intercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the inner cavities of nanotubes offer an ideal environment to investigate the magnetism at the nanoscale. We report the largest diamagnetic shifts down to −68.3 ppm ever observed in carbon allotropes, which is connected to the enhancement of the aromaticity of the nanotube envelope upon intercalation. The metallization of intercalated peapods is evidenced from the chemical shift anisotropy and spin-lattice relaxation (T 1 ) measurements. The observed relaxation curves signal a three-component model with two slow and one fast relaxing components. We assigned the fast component to the unpaired electrons charged C 60 that show a phase transition near 100 K. The two slow components can be rationalized by the two types of charged C 60 at two different positions with a linear regime following Korringa behavior, which is typical for metallic system and allow us to estimate the density of sate at Fermi level n(E F ).
language: eng
source:
identifier: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4931146
fulltext: fulltext
issn:
  • 0021-8979
  • 1089-7550
  • 00218979
  • 10897550
url: Link


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titleProperties of K,Rb-intercalated C 60 encapsulated inside carbon nanotubes called peapods derived from nuclear magnetic resonance
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descriptionWe present a detailed experimental study on how magnetic and electronic properties of Rb,K-intercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the inner cavities of nanotubes offer an ideal environment to investigate the magnetism at the nanoscale. We report the largest diamagnetic shifts down to −68.3 ppm ever observed in carbon allotropes, which is connected to the enhancement of the aromaticity of the nanotube envelope upon intercalation. The metallization of intercalated peapods is evidenced from the chemical shift anisotropy and spin-lattice relaxation (T 1 ) measurements. The observed relaxation curves signal a three-component model with two slow and one fast relaxing components. We assigned the fast component to the unpaired electrons charged C 60 that show a phase transition near 100 K. The two slow components can be rationalized by the two types of charged C 60 at two different positions with a linear regime following Korringa behavior, which is typical for metallic system and allow us to estimate the density of sate at Fermi level n(E F ).
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descriptionWe present a detailed experimental study on how magnetic and electronic properties of Rb,K-intercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the inner cavities of nanotubes offer an ideal environment to investigate the magnetism at the nanoscale. We report the largest diamagnetic shifts down to −68.3 ppm ever observed in carbon allotropes, which is connected to the enhancement of the aromaticity of the nanotube envelope upon intercalation. The metallization of intercalated peapods is evidenced from the chemical shift anisotropy and spin-lattice relaxation (T 1 ) measurements. The observed relaxation curves signal a three-component model with two slow and one fast relaxing components. We assigned the fast component to the unpaired electrons charged C 60 that show a phase transition near 100 K. The two slow components can be rationalized by the two types of charged C 60 at two different positions with a linear regime following Korringa behavior, which is typical for metallic system and allow us to estimate the density of sate at Fermi level n(E F ).
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abstractWe present a detailed experimental study on how magnetic and electronic properties of Rb,K-intercalated C 60 encapsulated inside carbon nanotubes called peapods can be derived from 13 C nuclear magnetic resonance investigations. Ring currents do play a basic role in those systems; in particular, the inner cavities of nanotubes offer an ideal environment to investigate the magnetism at the nanoscale. We report the largest diamagnetic shifts down to −68.3 ppm ever observed in carbon allotropes, which is connected to the enhancement of the aromaticity of the nanotube envelope upon intercalation. The metallization of intercalated peapods is evidenced from the chemical shift anisotropy and spin-lattice relaxation (T 1 ) measurements. The observed relaxation curves signal a three-component model with two slow and one fast relaxing components. We assigned the fast component to the unpaired electrons charged C 60 that show a phase transition near 100 K. The two slow components can be rationalized by the two types of charged C 60 at two different positions with a linear regime following Korringa behavior, which is typical for metallic system and allow us to estimate the density of sate at Fermi level n(E F ).
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