title: Dia-magnetic to ferro-magnetic behavioral change of Fe-catalysts based nitrogenated carbon nanotubes (NCNTs) by the process of chlorination/oxidation.
abstract: In this work, we have synthesized multiwall nitrogenated carbon nanotubes (MW-NCNTs) with Fe-catalysts by the microwave plasma-enhanced chemical vapor deposition process @950 degrees C and subsequently functionalized with chlorine and oxygen. The dia-magnetic behavioral M-H loop of non-functionalized MW-NCNTs were turn into ferromagnetic behaviors by the process of chlorination and oxidation respectively; which were characterized by means of superconducting quantum interference device magnetometer within the temperature range 5-300 K. A prominent cusp like behavior is also observed at around approximately 45 K in M(FC) and M(ZFC) measurements confirming the ferromagnetic behaviors of these MW-NCNTs after chlorination and oxidation.
authors.affiliation: School of Physics, University of the Witwatersrand, Private Bag 3, Wits-2050, Johannesburg, South Africa.
authors.forename: S C
authors.initials: SC
authors.lastname: Ray
authors.forename: D R
authors.initials: DR
authors.lastname: Sahu
authors.forename: P
authors.initials: P
authors.lastname: Papakonstantinou