In situ fabrication and characterization of cobalt ferrite nanorods/graphene composites

Journal Article · Sun Dec 15 00:00:00 EST 2013 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2013.10.019· OSTI ID:22288715

Fu, Min; Jiao, Qingze; Zhao, Yun

Cobalt ferrite nanorods/graphene composites were prepared by a one-step hydrothermal process using NaHSO{sub 3} as the reducing agent and 1-propyl-3-hexadecylimidazolium bromide as the structure growth-directing template. The reduction of graphene oxide and the in situ formation of cobalt ferrite nanorods were accomplished in a one-step reaction. The structure and morphology of as-obtained composites were characterized by field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, atomic force microscope, X-ray diffractometer, Fourier transform infrared spectra, X-ray photoelectron spectroscopy and Raman spectroscopy. Uniform rod-like cobalt ferrites with diameters of about 100 nm and length of about 800 nm were homogeneously distributed on the graphene sheets. The hybrid materials showed a saturation magnetization of 42.5 emu/g and coercivity of 495.1 Oe at room temperature. The electromagnetic parameters were measured using a vector network analyzer. A minimum reflection loss (RL) of − 25.8 dB was observed at 16.1 GHz for the cobalt ferrite nanorods/graphene composites with a thickness of 2 mm, and the effective absorption frequency (RL < − 10 dB) ranged from 13.5 to 18.0 GHz. The composites exhibited better absorbing properties than the cobalt ferrite nanorods and the mixture of cobalt ferrite nanorods and graphene. - Highlights: • Reduction of GO and formation of ferrites were accomplished in a one-step reaction. • Ionic liquid was used to control 1D growth of ferrite nanorods for the first time. • Cobalt ferrite nanorods/graphene composites showed dielectric and magnetic loss. • Cobalt ferrite nanorods/graphene composites exhibited better absorbing properties.

• OSTI ID: 22288715
• Journal Information: Materials Characterization, Vol. 86; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ATOMIC FORCE MICROSCOPY
BROMIDES
COBALT
COERCIVE FORCE
DIELECTRIC MATERIALS
FERRITE
FERRITES
FIELD EMISSION
FOURIER TRANSFORMATION
GHZ RANGE 01-100
GRAPHENE
INFRARED SPECTRA
MICROWAVE RADIATION
NANOSTRUCTURES
OXIDES
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTOMETERS
X-RAY PHOTOELECTRON SPECTROSCOPY