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Magnetic properties of Fe catalysts included in carbon nanotubes
Author(s) -
Jang Jae Won,
Lee Kyu Won,
Lee Cheol Eui,
Lee Tae Jae,
Lee Cheol Jin,
Lyu Seung Chul
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304526
Subject(s) - carbon nanotube , catalysis , superparamagnetism , materials science , vapor phase , squid , magnetic moment , phase (matter) , chemical engineering , nanotechnology , carbon fibers , atmospheric temperature range , analytical chemistry (journal) , magnetization , chemistry , composite material , magnetic field , organic chemistry , thermodynamics , condensed matter physics , ecology , physics , quantum mechanics , biology , composite number , engineering
We have synthesized multiwalled carbon nanotubes (MWNTs) including Fe catalysts by the vapor phase growth method at 950 °C. Different Fe concentrations were obtained by varying the Ar and CO flow rates during the vapor phase growing of the MWNTs. Magnetic properties of the MWNTs with different Fe concentrations were characterized by means of SQUID measurements in the temperature range of 5–300 K. As a result, superparamagnetic behaviors were observed at all the Fe concentrations. The form of the Fe catalysts included in MWNTs was discussed in view of the change of the average magnetic moment and the number of Fe particles with changing Fe concentration. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)