Magnetic properties of NiFe2O4/carbon nanofibers from Venezuelan petcoke

Abstract:

NiFe<inf>2</inf>O<inf>4</inf>/carbon nanofibers (NiFe<inf>2</inf>O<inf>4</inf>/CNFs) have been successfully synthesized by hydrotermal method using Venezuelan petroleum coke (petcoke) as carbon source and NiFe<inf>2</inf>O<inf>4</inf> as catalyst. The morphology, structural and magnetic properties of nanocomposite products were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), vibrating sample magnetometry (VSM) and electron paramagnetic resonance (EPR). XRD analysis revealed a cubic spinel structure and ferrite phase with high crystallinity. HR-TEM reveals the presence of CNFs with diameters of 4±2 nm. At room temperature, NiFe<inf>2</inf>O<inf>4</inf>/CNFs show superparamagnetic behavior with a maximum magnetization of 15.35 emu/g. Our findings indicate that Venezuelan petroleum coke is suitable industrial carbon source for the growth of magnetic CNFs.Highlights NiFe<inf>2</inf>O<inf>4</inf>/CNFs have been synthesized by hydrothermal method using petroleum coke.Nickel ferrite nanoparticles were used as the catalyst.HR-TEM reveals the presence of CNFs with diameters of 4±2 nm.The size of the nanoparticles defines the diameter of the CNFs. ©2014 Elsevier B.V. All rights reserved.

Año de publicación:

2015

Keywords:

• Carbon nanofibers
• Petcoke
• ferrite
• nanocomposite
• magnetic properties

Fuente:

scopus