Iron carbide nanoparticles growth in room temperature ionic liquids [C n -MIM][BF4] (n = 12, 16)
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The thermal decomposition of Fe x (CO) y precursors for the synthesis of nanoparticles of iron carbides and their superstructures with sizes ranging from 2.8 to 15.1 nm is developed using imidazolium-based ionic liquids as solvents, stabilizers, and carbon source. A study of the influence of some synthesis parameters such as the heating temperature, nature, and concentration of the iron carbonyl precursor and chain length of the N-alkyl substituent on the imidazolium ring on the size and organization of the iron carbide nanoparticles is presented. These iron carbides nano-objects were characterized by infra-red spectroscopy, transmission electronic microscopy, powder X-ray diffraction, Mossbauer spectroscopy, and magnetic analyses.
KeywordsNanoparticle Cementite Iron carbide Ionic Liquids Magnetic properties
The authors thank Mme Corine Reibel (ICGM, Montpellier, France) for magnetic measurements. This work was supported by the University of Montpellier II, CNRS and French ANR-2010-BLAN-0810 NEQSON project. L. L. thanks the UFI (GF/IR/732/07, n°25) for financial support.
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