Effects of Cu and Mn dopings on the structural, optical, and magnetic properties of Zn0.98Fe0.02O nanopowders

Ahmed, Sohail

doi:10.1007/s10853-016-0736-4

Cited by 9 publications

(9 citation statements)

References 56 publications

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“…Many methods have been employed to optimize the optical, electrical, and magnetic properties of ZnO materials, and among them doping is considered as one of the most effective approaches. Thus, doping is used in order to change the band gap energy of ZnO, either by narrowing the band gap or by introducing energy levels in the band gap of semiconductor materials [17][18][19][20][21][22][23][24][25]. 3d transition metal (TM) ions such as Ti, V, Mn, Fe, Co, Ni, and Cu are generally preferred to substitute for the e-mail: ozlem.bilgili@deu.edu.tr cations of the host semiconductors.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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Zn1−xMnxO (x = 0.00, 0.01, and 0.05, respectively) was synthesized by using solid state reaction method. The structural properties were characterized by using X-ray diffraction and scanning electron microscopy. Optical properties were investigated by UV-visible spectroscopy. X-ray diffraction patterns indicate that all samples have hexagonal wurtzite structure without any impurity phases. The diffraction intensity increases and the peak position shifts to a lower 2θ angle with Mn concentration. The lattice parameters a and c, the volume of unit cell increase with Mn content indicating that Mn 2+ ions go to Zn 2+ ions in ZnO lattice. The grain size increases with Mn doping while the microstrain and dislocation density decrease. UV-vis spectra of the samples show that undoped ZnO sample has an energy band gap Eg of 3.34 eV. The optical study indicates a red shift in the absorbance spectra and a decrease in the band gap Eg with Mn content. This decrease of band gap may be attributed to the influence of dopant ions. The morphology and grain distribution of ZnO samples were analysed by scanning electron microscopy. The particle sizes are higher in doped samples when compared to the undoped sample and the surface roughness increases with Mn content. The grains are closely, densely packed and pores/voids between the grains increase with Mn content.

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Section: Introductionmentioning

confidence: 99%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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“…2(b). As seen in that figure, E g of the ZF4 sample is 2.84 eV, which is lower than that of the undoped ZnO (3.27 eV) [13], whereas the ZF2 sample has an E g of 3.39 eV. The bandgap values for the ZF6, ZF8, ZF2-600, and ZF2-700 samples are 3.36, 3.25, 3.35, and 3.31 eV, respectively.…”

Section: B Optical Characterization and Defect Analysis: 1 Optical mentioning

confidence: 71%

“…Mishra et al [40] reported that the Zn i defects are highly mobile at and above 400ºC, and they are likely to recombine with the V Zn that is dominant in ZnO nanocrystal grain boundaries. Note that all of the samples in our case were annealed in ambient air, resulting in an oxygen-deficient ZnO crystal [13,14,37,38]; consequently, the visible emission is most likely connected to the oxygen vacancy defects, and it can be clear that the samples have plenty of V O .…”

Section: Photoluminescence Analysismentioning

confidence: 89%

“…%, respectively) were synthesized using the solid-state reaction method. Details of the sample preparation procedures have been described elsewhere [13,14]. To gain more insight into the origin of the ferromagnetic behavior, annealing treatments were carried out in air (12 h) at two different temperatures of 600 and 700ºC for ZF2 (hereafter referred as ZF2-600 and ZF2-700, respectively).…”

Section: A Preparation Of the Fe-doped Zno Nanopowdersmentioning

confidence: 99%

“…Very recently we have performed the detailed experimental studies of the Zn 0.98 Fe 0.02 O nanoscale powders [13], which have provided a strong support for "intrinsic" origin of ferromagnetism in the Fe-doped ZnO powders, that is ascribed to the presence of oxygen vacancy defects. In the present work, to clarify the effect of the doping concentration and annealing temperature (T A ), we extended our study to Fe-doped ZnO, varied the doping concentration, and annealed the samples at two temperatures.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Effects of Annealing Temperature and Dopant Concentration on the Structural, Optical, and Magnetic Properties of Iron-Doped ZnO Samples

2017

Aug. 2017 Thailand International Conferences BackICMBPS-17, ICCSIT-17, LHEBC-17, IETCIA-17, ICBEFS-17, CM3E-17, AHSS-17, CBCE-1

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This paper reports on the structural, optical, and magnetic properties of as-prepared and annealed Zn 1-x Fe x O (0.02≤x≤0.08) powders synthesized using the solid-state reaction method. X-ray diffraction (XRD) studies showed that Fe was incorporated into the ZnO lattice. Ultraviolet-Visible (UV-vis) spectrophotometry measurements revealed that the bandgap initially increased and then decreased with Fe doping. Photoluminescence (PL) studies confirmed the formation of oxygen vacancies (V O) in all of the samples. All of the samples exhibited ferromagnetic behavior at room temperature (RT). Ferromagnetic behavior decreased with increased Fe concentrations, due to the increase in the number of Fe atoms occupying the neighboring cation lattice sites, which resulted in an antiferromagnetic configuration. Ferromagnetic behavior also decreased with the increase in the annealing temperature (T A) due to the reduction of defects and/or V O. However, our results indicate that the ferromagnetic property is intrinsic to the ZnO system due to defects and/or V O , and the extrinsic impurity origin was excluded..

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Room-temperature ferromagnetism in Co-, Cr-, and V-doped ZnO diluted magnetic semiconductor

Ahmed

2017

Appl. Phys. A

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Effects of Cu and Mn dopings on the structural, optical, and magnetic properties of Zn0.98Fe0.02O nanopowders

Cited by 9 publications

References 56 publications

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Effects of Annealing Temperature and Dopant Concentration on the Structural, Optical, and Magnetic Properties of Iron-Doped ZnO Samples

Room-temperature ferromagnetism in Co-, Cr-, and V-doped ZnO diluted magnetic semiconductor

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