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Synthesis of Carbon Nanofibers with Maghemite via a Modified Sol-Gel Technique

AuthorsDíaz Silva, N.; Valdez Salas, B.V; Nedev, N.; Curiel Alvarez, M.; Bastidas Rull, José María; Zlatev, R.; Stoytcheva, M.
KeywordsCarbon nanofibers
Magnetic properties
Carbon nanohybrid
Issue Date2017
PublisherHindawi Publishing Corporation
CitationJournal of Nanomaterials: ID 5794312 (2017)
AbstractCarbon nanohybrid material (CNF/γ-FeO) was obtained via a modified sol-gel technique consisting of two steps: functionalization of carbon nanofibers (CNF) in HSO/HNO followed by synthesis using Fe(NO)·9HO. As a result, the iron content of the CNF/γ-FeO was increased by more than twice from about 40% to about 87% mass percent, compared to the pristine CNF and oxidized CNF specimens, as proved by energy dispersive X-ray fluorescence. Scanning electron microscopy images exhibited >cumulus> on the CNF/γ-FeO specimen surface, which showed the highest iron mass percentage, proved by energy dispersive X-ray spectroscopy. Transmission electron microscopy images confirmed attachment of γ-FeO cumulus to the inner and outer surfaces of the CNF walls after synthesis. The characteristic peaks of Fe 2p and Fe 2p appeared in the XPS spectra obtained on CNF/γ-FeO. In addition, X-ray diffraction (XRD) results indicated formation of γ-FeO during the synthesis process. The Raman spectrum of the CNF/γ-FeO sample displays peaks with positions close to characteristic peaks of highly crystalline and monodisperse maghemite nanocrystallites. The synthesis of CNF/γ-FeO leads to an increase in the hydrophilicity of CNF and magnetic properties at room temperature.
Publisher version (URL)https://doi.org/10.1155/2017/5794312
Identifiersdoi: 10.1155/2017/5794312
issn: 1687-4129
Appears in Collections:(CENIM) Artículos
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