Comparative study on the physical properties of transition metal-doped (Co, Ni, Fe, and Mn) ZnO nanoparticles

Nano-crystalline of TM-doped ZnO with general formula Zn 0.97 TM 0.03 O (TM: Mn, Fe, Co, and Ni) was prepared using sol–gel method. The dependence of crystal structure, morphology, and optical and magnetic properties on the type of transition metals was investigated. The XRD investigation of pure an...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2018-07, Vol.124 (7), p.1-10, Article 469
Main Authors: Azab, A. A., Ateia, Ebtesam E., Esmail, S. A.
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Cobalt
Condensed Matter Physics
Crystal structure
Dependence
Dopants
Energy gap
Ferromagnetism
Investigations
Iron
Kubelka-Munk equations
Machines
Magnetic properties
Manganese
Manufacturing
Materials science
Morphology
Nanoparticles
Nanotechnology
Nickel
Optical and Electronic Materials
Optical properties
Physical properties
Physics
Physics and Astronomy
Processes
Reflectance
Sol-gel processes
Surfaces and Interfaces
Thin Films
Transition metals
Wurtzite
Zinc oxide
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Summary:Nano-crystalline of TM-doped ZnO with general formula Zn 0.97 TM 0.03 O (TM: Mn, Fe, Co, and Ni) was prepared using sol–gel method. The dependence of crystal structure, morphology, and optical and magnetic properties on the type of transition metals was investigated. The XRD investigation of pure and TM-doped ZnO nanoparticles samples confirms the formation of single-phase hexagonal wurtzite structure. The estimated crystallite sizes are found in the range of 17 and 38 nm for the doped and pure samples, respectively. The obtained data suggest that the dopant type plays a vital role in the physical properties of the investigated samples. The optical band-gap energy Eg has been calculated from near infrared (NIR) and visible (VIS) reflectance spectra using the Kubelka–Munk function. Minimum value of 2.398 eV and maximum one of 3.29 eV were obtained for Manganese-doped ZnO and pure ZnO, respectively. The analysis of XRD and VSM of the samples confirms that the observed room-temperature (RT) ferromagnetism can be attributed to an intrinsic property of doped material sample and not due to formation of any secondary phase. The magnetic results show that Mn is the most effective dopant for producing ferromagnetism in nanoparticles of ZnO.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-018-1871-3