Synthesis of α-Fe{sub 2}O{sub 3}-functionalised graphene oxide nanocomposite by a facile low temperature method and study of its magnetic and hyperfine properties

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.10.017· OSTI ID:22581413

Nag, Sanchayita ^[1]; Roychowdhury, Anirban ^[2]; Das, Dipankar ^[2]; Mukherjee, Sampad ^[1]

---

1. Department of Physics, IIEST, Shibpur, Howrah 711103 (India)
2. UGC-DAE Consortium for Scientific Research, III/LB-8, Bidhannagar, Kolkata 700098 (India)

Highlights: • Synthesis of reduced graphene oxide (rGO)/α-Fe{sub 2}O{sub 3} nanocomposites (NCs) by sol–gel method. • Samples exhibited ferromagnetism originated due to surface canted spins. • rGO enhanced the value of saturation magnetization and coercivity of the bare nanoparticle. • RKKY coupling between the isolated rGO spins and the magnetic nanoparticles. - Abstract: Reduced graphene oxide/α-Fe{sub 2}O{sub 3} nanocomposites were synthesized by a simple sol–gel method. Initially, the samples were investigated by X-ray diffraction, high resolution transmission electron microscopy and Raman spectroscopy. High resolution transmission electron micrographs indicate that the magnetic nanoparticles are well dispersed in the reduced graphene oxide sheet-like structure. Fourier transform infrared spectroscopy studies corroborate the results obtained by X-ray diffraction. Temperature as well as field dependent magnetic measurements revealed ferromagnetism in the pristine α-Fe{sub 2}O{sub 3} as well as in the nanocomposite sample that is attributed to surface canted spins and defects present in the samples. The enhanced value of coercivity in case of the nanocomposite sample could be ascribed to the Ruderman–Kittel–Kasuya–Yosida type of interaction between the isolated reduced graphene oxide spin and the magnetic ions. Presence of super paramagnetic doublet as well as sextet patterns related to hematite phase is confirmed by the {sup 57}Fe-Mössbauer spectroscopy.

• OSTI ID: 22581413
• Journal Information: Materials Research Bulletin, Vol. 74; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CARBON OXIDES
COERCIVE FORCE
COUPLING
FERROMAGNETISM
FOURIER TRANSFORMATION
GRAPHENE
HEMATITE
IRON 57
IRON OXIDES
MAGNETIC PROPERTIES
MAGNETIZATION
NANOCOMPOSITES
NANOPARTICLES
PARAMAGNETISM
RAMAN SPECTROSCOPY
SOL-GEL PROCESS
SPIN
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION