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Communications: nanomagnetic shielding: high-resolution NMR in carbon allotropes
Umeå University, Faculty of Science and Technology, Department of Physics.
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2010 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 132, no 2, 021102- p.Article in journal (Refereed) Published
Abstract [en]

The understanding and control of the magnetic properties of carbon-based materials is of fundamental relevance in applications in nano- and biosciences. 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 of synthetic materials at the nanoscale. Here, by means of 13 C high resolution NMR of encapsulated molecules in peapod hybrid materials, 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 doping. This diamagnetic shift can be externally controlled by in situ modifications such as doping or electrostatic charging. Moreover, defects such as C-vacancies, pentagons, and chemical functionalization of the outer nanotube quench this diamagnetic effect and restore NMR signatures to slightly paramagnetic shifts compared to nonencapsulated molecules. The magnetic interactions reported here are robust phenomena independent of temperature and proportional to the applied magnetic field. The magnitude, tunability, and stability of the magnetic effects make the peapod nanomaterials potentially valuable for nanomagnetic shielding in nanoelectronics and nanobiomedical engineering.

Place, publisher, year, edition, pages
American Institute of Physics , 2010. Vol. 132, no 2, 021102- p.
URN: urn:nbn:se:umu:diva-35954DOI: 10.1063/1.3284740OAI: diva2:350417
Available from: 2010-09-10 Created: 2010-09-10 Last updated: 2010-11-09Bibliographically approved

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Wågberg, ThomasTalyzin, Alexandr
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