Structural, magnetic and electronic structure properties of Co doped ZnO nanoparticles

[Display omitted] •XRD and HR-TEM results show the single phase nature of Co doped ZnO nanoparticles.•XMCD and dc magnetization results indicate the RT-FM in Co doped ZnO nanoparticles.•Co L3,2 NEXAFS spectra infer that Co ions are in 2+ valence state.•O K edge NEXAFS spectra show that O vacancy inc...

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Bibliographic Details
Published in:Materials research bulletin 2015-06, Vol.66, p.76-82
Main Authors: Kumar, Shalendra, Song, T.K., Gautam, Sanjeev, Chae, K.H., Kim, S.S., Jang, K.W.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
Chemical synthesis
COBALT ADDITIONS
DOPED MATERIALS
Electronic material
ELECTRONIC STRUCTURE
FERROMAGNETISM
FOURIER TRANSFORM SPECTROMETERS
HYSTERESIS
INFRARED SPECTRA
MAGNETIC CIRCULAR DICHROISM
MAGNETIC PROPERTIES
MAGNETIZATION
NANOPARTICLES
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
XANES
ZINC OXIDES
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Summary:[Display omitted] •XRD and HR-TEM results show the single phase nature of Co doped ZnO nanoparticles.•XMCD and dc magnetization results indicate the RT-FM in Co doped ZnO nanoparticles.•Co L3,2 NEXAFS spectra infer that Co ions are in 2+ valence state.•O K edge NEXAFS spectra show that O vacancy increases with Co doping in ZnO. We reported structural, magnetic and electronic structure studies of Co doped ZnO nanoparticles. Doping of Co ions in ZnO host matrix has been studied and confirmed using various methods; such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersed X-ray (EDX), high resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, magnetic hysteresis loop measurements and X-ray magnetic circular dichroism (XMCD). From the XRD and HR-TEM results, it is observed that Co doped ZnO nanoparticles have single phase nature with wurtzite structure and exclude the possibility of secondary phase formation. FE-SEM and TEM micrographs show that pure and Co doped nanoparticles are nearly spherical in shape. O K edge NEXAFS spectra indicate that O vacancies increase with Co doping. The Co L3,2 edge NEXAFS spectra revealed that Co ions are in 2+ valence state. DC magnetization hysteresis loops and XMCD results clearly showed the intrinsic origin of temperature ferromagnetism in Co doped ZnO nanoparticles.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2015.02.020