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Magnetische Eigenschaften von mit Stickstoff dotierten mehrwandigen Kohlenstoffnanoröhren
Author(s) -
Grechnev G.E.,
Desnenko V.A.,
Fedorchenko A.V.,
Panfilov A.S.,
Kolesnichenko Y.A.,
Khrapatiy S.V.,
Prylutskyy Y.I.,
Matzui L.Y.,
Ritter U.,
Scharff P.
Publication year - 2013
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201300083
Subject(s) - carbon nanotube , squid , materials science , magnetization , coercivity , doping , magnetic moment , liquid nitrogen , nitrogen , saturation (graph theory) , analytical chemistry (journal) , thermogravimetric analysis , magnetic field , condensed matter physics , nuclear magnetic resonance , nanotechnology , chemistry , optoelectronics , physics , ecology , mathematics , organic chemistry , quantum mechanics , combinatorics , biology , chromatography
The magnetic properties of nitrogen‐doped multi‐walled carbon nanotubes (N‐MWCNTs) were studied in the temperature and magnetic field range of (4.2–290) K and (0.05–30) kOe, respectively. Also magnetic properties of the reference MWCNTs without nitrogen doping were investigated on the same footing for comparison. The presence of iron‐based particles inside N‐MWCNTs was detected. The low temperature SQUID (Superconducting Quantum Interference Device) magnetization measurements were supplemented with thermogravimetric analysis. The magnetic characterization provided the saturation magnetic moment M S and residual magnetization M R of N‐MWCNTs to be, respectively, 4.5 emu/g and 0.9 emu/g, whereas for the reference MWCNTs the corresponding parameters are found to be about twice higher. The coercive field value amounts to 800 Oe for both systems at low temperatures, then decreasing to about 450 Oe at 200 K.