13C NMR and EPR of carbon nanofoam

R. Blinc; P. Cevc; D. Arčon; B. Zalar; A. Zorko; T. Apih; F. Milia; N. R. Madsen; A. G. Christy; A. V. Rode

doi:10.1002/pssb.200669152

¹³C NMR and EPR of carbon nanofoam

R. Blinc^*, P. Cevc, D. Arčon, B. Zalar, A. Zorko, T. Apih, F. Milia, N. R. Madsen, A. G. Christy, A. V. Rode

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The ¹³C NMR spectra of a carbon nanofoam sample, exhibiting a peak in the ZFC magnetic susceptibility, show a single ¹³C line at room temperature and a two peak structure at 100 K. The splitting and the NMR shifts are however much too small to be associated with true ferromagnetism as for instance observed in TDAE-C₆₀ below T_C. The X-band EPR spectra show the presence of a least three different paramagnetic clusters with g_a = 2.0016, g_b = 2.0031, g_c = 2.0036 and very different electronic spin-lattice relaxation times. In some samples the CW EPR spectra show an additional rather broad and strongly temperature dependent line shifted to lower fields, which is characteristic of ferromagnetic systems. The results thus show an inhomogeneous super-paramagnetic or spin-glass like nature of magnetism in cluster assembled carbon nanofoam rather than homogeneous ferromagnetism.

Original language	English
Pages (from-to)	3069-3072
Number of pages	4
Journal	Physica Status Solidi (B): Basic Research
Volume	243
Issue number	13
DOIs	https://doi.org/10.1002/pssb.200669152
Publication status	Published - Nov 2006

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title = "13C NMR and EPR of carbon nanofoam",

abstract = "The 13C NMR spectra of a carbon nanofoam sample, exhibiting a peak in the ZFC magnetic susceptibility, show a single 13C line at room temperature and a two peak structure at 100 K. The splitting and the NMR shifts are however much too small to be associated with true ferromagnetism as for instance observed in TDAE-C60 below TC. The X-band EPR spectra show the presence of a least three different paramagnetic clusters with ga = 2.0016, gb = 2.0031, gc = 2.0036 and very different electronic spin-lattice relaxation times. In some samples the CW EPR spectra show an additional rather broad and strongly temperature dependent line shifted to lower fields, which is characteristic of ferromagnetic systems. The results thus show an inhomogeneous super-paramagnetic or spin-glass like nature of magnetism in cluster assembled carbon nanofoam rather than homogeneous ferromagnetism.",

author = "R. Blinc and P. Cevc and D. Ar{\v c}on and B. Zalar and A. Zorko and T. Apih and F. Milia and Madsen, {N. R.} and Christy, {A. G.} and Rode, {A. V.}",

year = "2006",

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volume = "243",

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TY - JOUR

T1 - 13C NMR and EPR of carbon nanofoam

AU - Blinc, R.

AU - Cevc, P.

AU - Arčon, D.

AU - Zalar, B.

AU - Zorko, A.

AU - Apih, T.

AU - Milia, F.

AU - Madsen, N. R.

AU - Christy, A. G.

AU - Rode, A. V.

PY - 2006/11

Y1 - 2006/11

N2 - The 13C NMR spectra of a carbon nanofoam sample, exhibiting a peak in the ZFC magnetic susceptibility, show a single 13C line at room temperature and a two peak structure at 100 K. The splitting and the NMR shifts are however much too small to be associated with true ferromagnetism as for instance observed in TDAE-C60 below TC. The X-band EPR spectra show the presence of a least three different paramagnetic clusters with ga = 2.0016, gb = 2.0031, gc = 2.0036 and very different electronic spin-lattice relaxation times. In some samples the CW EPR spectra show an additional rather broad and strongly temperature dependent line shifted to lower fields, which is characteristic of ferromagnetic systems. The results thus show an inhomogeneous super-paramagnetic or spin-glass like nature of magnetism in cluster assembled carbon nanofoam rather than homogeneous ferromagnetism.

AB - The 13C NMR spectra of a carbon nanofoam sample, exhibiting a peak in the ZFC magnetic susceptibility, show a single 13C line at room temperature and a two peak structure at 100 K. The splitting and the NMR shifts are however much too small to be associated with true ferromagnetism as for instance observed in TDAE-C60 below TC. The X-band EPR spectra show the presence of a least three different paramagnetic clusters with ga = 2.0016, gb = 2.0031, gc = 2.0036 and very different electronic spin-lattice relaxation times. In some samples the CW EPR spectra show an additional rather broad and strongly temperature dependent line shifted to lower fields, which is characteristic of ferromagnetic systems. The results thus show an inhomogeneous super-paramagnetic or spin-glass like nature of magnetism in cluster assembled carbon nanofoam rather than homogeneous ferromagnetism.

UR - http://www.scopus.com/inward/record.url?scp=33751244538&partnerID=8YFLogxK

U2 - 10.1002/pssb.200669152

DO - 10.1002/pssb.200669152

M3 - Article

SN - 0370-1972

VL - 243

SP - 3069

EP - 3072

JO - Physica Status Solidi (B): Basic Research

JF - Physica Status Solidi (B): Basic Research

IS - 13

ER -

¹³C NMR and EPR of carbon nanofoam

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