Sol–gel synthesis, structural, optical and magnetic properties of Co-doped ZnO nanoparticles

Ghoul, J. El; Kraini, M.; Lemine, O.M.; Mır, L. El

doi:10.1007/s10854-015-2732-x

Cited by 33 publications

(14 citation statements)

References 41 publications

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“…Therefore, more studies have to be done to understand the room-temperature ferromagnetism in TM-doped ZnO. Our synthesis method which was used also in recent work on Co-doped ZnO [44] encourages us to extend this work to other TM doped ZnO.…”

Section: Resultsmentioning

confidence: 96%

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Omri

Lemine

Ghoul

et al. 2015

J Mater Sci: Mater Electron

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We report the synthesis of Zn 1-x Mn x O nanoparticles prepared by a sol-gel processing technique for x ranging from 0 to 0.05. The structural, morphological and magnetic properties of the nanoparticles were investigated by XRD, transmission electron microscopy and superconducting quantum interference device. The structural properties showed that the obtained nanoparticles are in wurtzite phase structure with the presence of ZnMnO 3 secondary phase at higher concentration. The crystallite size decreases with increasing Mn concentration and is in the range of 35-17 nm. All the samples are ferromagnetic with clear hysteresis loop at room temperature but with low values for the saturation. It was found that increasing Mn concentration is not helping the long range ferromagnetic order, which might be due to the antiferromagnetic exchanges. This ferromagnetism order is due mainly to the defects and to the substituting of Mn in the ZnO host rather than from the secondary phases of Mn.

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Section: Resultsmentioning

confidence: 96%

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Omri

Lemine

Ghoul

et al. 2015

J Mater Sci: Mater Electron

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“…Upon doping ZnO/SiO 2 with Co, Mn and Cu, the energy gap decreased. Many authors have been reported a reduction in the band gap energy with increase the Co‐doped concentration in ZnO prepared by different methods as a nanopowder or thin film . Moreover, Das et.al found also a reduction in energy gap of ZnO upon Cu introduced into ZnO matrix.…”

Section: Resultsmentioning

confidence: 99%

Structural and optical properties of doped ZnO/SiO₂ nanocomposite

Mohamed

Abdel-Kader

Alhazime

2019

Int J Applied Ceramic Tech

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The synthesis of ZnO/SiO2 nanocomposite doped with Co, Cu and Mn nanoparticles were performed using sol‐gel method. Rietveld refinement analysis was done for the X‐ray diffraction data and results showed that all samples are single wurtzite hexagonal phase and have an average crystallite size ~14 nm. The lattice parameters, bond length, crystallite size, microstrain, dislocation density and the system volume were studied in details. Transmission electron microscopy technique showed that nanoparticles characterized by an elliptical shape. Fourier transform infrared and scanning electron microscope techniques proved the presence of SiO2 in the system. The energy gap values of both undoped and doped samples with Co, Mn and Cu were 2.84, 2.47, 2.71 and 2.8 eV, respectively. Photoluminescence spectra for undoped and doped ZnO/SiO2 were investigated in details.

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“…The average crystallite size (D) along the c-axis was calculated using Debye-Scherrer's formula [24]. The dislocation density (d), defined as the length of dislocation lines in per unit volume of the crystal, was calculated using the formula [25]:…”

Section: Resultsmentioning

confidence: 99%

Effect of Er doping on microstructure and optical properties of ZnO thin films prepared by sol–gel method

Mao

et al. 2015

J Mater Sci: Mater Electron

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Er doped ZnO (EZO) thin films were successfully prepared by sol-gel spin coating method on quartz glass substrates. The effect of Er doping content on the microstructure and optical properties of EZO thin films were investigated. The X-ray diffraction and X-ray photoelectron spectroscopy results indicate that Er was successfully incorporated into the EZO thin films and substituted the Zn sites. The incorporation of Er could affect the band gap (E g ) and optical constants of ZnO thin films. The photoluminescence spectra show that the 1.54 lm emission, which originates from the transition of Er 3? : 4I 13/2 ? 4I 15/2 , was observed in EZO thin films. Furthermore, it is demonstrated that the formation of singly ionized oxygen vacancies (V OÁ ) could be inhibited by the incorporation of Er dopant, which is supported by further defect formation energies calculations.

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Sol–gel synthesis, structural, optical and magnetic properties of Co-doped ZnO nanoparticles

Cited by 33 publications

References 41 publications

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Structural and optical properties of doped ZnO/SiO₂ nanocomposite

Effect of Er doping on microstructure and optical properties of ZnO thin films prepared by sol–gel method

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Sol–gel synthesis, structural, optical and magnetic properties of Co-doped ZnO nanoparticles

Cited by 33 publications

References 41 publications

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Structural and optical properties of doped ZnO/SiO2 nanocomposite

Effect of Er doping on microstructure and optical properties of ZnO thin films prepared by sol–gel method

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Structural and optical properties of doped ZnO/SiO₂ nanocomposite