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Birth of room‐temperature magnons and Raman line enhancement in ZnO nanostructures containing cobalt oxide
Author(s) -
Pandiyarajan T.,
Karthikeyan B.
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4388
Subject(s) - raman spectroscopy , wurtzite crystal structure , magnon , materials science , annealing (glass) , scanning electron microscope , analytical chemistry (journal) , cobalt , nanostructure , cobalt oxide , oxide , high resolution transmission electron microscopy , graphene , transmission electron microscopy , nanotechnology , chemistry , condensed matter physics , optics , zinc , ferromagnetism , physics , chromatography , metallurgy , composite material
Cobalt (Co) addition and thermal annealing induced structural and vibrational properties of ZnO nanostructures were analysed. X‐ray diffraction pattern reveals that the nanostructures are in hexagonal wurtzite type and the formation of Co 3 O 4 . The Co ion induced morphology changes have been studied by high‐resolution scanning electron microscope images and energy dispersive spectroscopy measurements confirm the presence of Co ions. CoO‐related magnon excitation bands are emerged at room temperature for the Co‐added samples. There are no changes in the band positions of the Raman spectra of pure and Co‐added materials. Annealed sample exhibits the suppression of magnon bands and formation of Co 3 O 4 : ZnO composites. Raman line width and the electron phonon coupling constant are decreased with respect to the annealing temperature. The formation of Co 3 O 4 : ZnO composite phases have further confirmed by infrared spectra. Copyright © 2013 John Wiley & Sons, Ltd.