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

Journal Article · Mon Jun 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.02.020· OSTI ID:22475790

Kumar, Shalendra ^[1]; Gautam, Sanjeev; Chae, K. H. ^[2]; Kim, S. S.; Jang, K. W. ^[1]

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1. Institute of Basic Sciences, Changwon National University, Changwon, Gyeongnam 641-773 (Korea, Republic of)
2. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of)

Highlights: • 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 L{sub 3,2} 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. - Abstract: 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 L{sub 3,2} 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.

• OSTI ID: 22475790
• Journal Information: Materials Research Bulletin, Vol. 66; 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

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTROSCOPY
COBALT ADDITIONS
DOPED MATERIALS
ELECTRONIC STRUCTURE
FERROMAGNETISM
FOURIER TRANSFORM SPECTROMETERS
HYSTERESIS
INFRARED SPECTRA
MAGNETIC CIRCULAR DICHROISM
MAGNETIC PROPERTIES
MAGNETIZATION
NANOPARTICLES
NANOSTRUCTURES
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ZINC OXIDES