Controlled structural and optical properties of ZnO nano-particles

Kazemi, Asieh Sadat; Abadyan, Mohamadreza; Ketabi, S. A.

doi:10.1088/0031-8949/82/03/035801

Cited by 9 publications

(16 citation statements)

References 23 publications

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“…The values of surface to volume ratio is small, it means that the particles are completely spherical in shape. Similar results are reported in literature [17]. The surface area to volume ratio is large due to the small particle and the surface effect described for (Zn, Mn)-O pairs at the surface changing the Zn 1-x Mn x O nanoparticles of average crystallite size.…”

Section: Surface Area To Volume Ratiosupporting

confidence: 90%

Effect of Mn Doping Concentration on Structural, Morphological and Optical Studies of ZnO Nano-particles

Mote¹,

Dargad²,

Dole³

2013

109

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We report the crystal structure, morphology and optical properties of the Zn 1-x Mn x O nanoparticles with nominal composition (x = 0.00, 0.05, 0.10, 0.15 & 0.20) were synthesized by sol-gel route. The crystal structure analysis was carried out by X-ray diffraction technique (XRD), morphology and particle size was investigated using Transition electron microscopy (TEM), Optical characterization was performed using UV-VIS technique. The XRD studies show that samples have wurtzite (hexagonal) crystal structure. In addition to this XRD results also indicate no extra impurity or secondary phases are observed. The lattice parameters a and c of Zn 1-x Mn x O nanoparticles increase with increasing Mn content which indicates that Mn 2+ ions go to Zn 2+ ions in the ZnO lattice. The atomic packing fraction (APF) increase of Mn doped ZnO nanoparticles with increasing Mn content. TEM microphotographs show that the pure and 10% Mn doped ZnO nanoparticles are in spherical shape and their average particle size of pure and 10% Mn doped ZnO nanoparticles are found in the range of 20-60 nm. The optical energy band gap decreases with increasing Mn concentration, it may be owing to Mn clustering.

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Section: Surface Area To Volume Ratiosupporting

confidence: 90%

Effect of Mn Doping Concentration on Structural, Morphological and Optical Studies of ZnO Nano-particles

Mote¹,

Dargad²,

Dole³

2013

109

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“…The calculated values of the S/V ratio are very small which means that the Zn 1-x Mn x O NPs are spherical in shape. Similar results have been reported in the literature (Kazemi et al, 2010).…”

Section: Xrd Structural Analysissupporting

confidence: 93%

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Imam¹,

Harfouche²,

Azab³

et al. 2022

J Synchrotron Rad

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γ-Irradiation and synchrotron-radiation-based X-ray absorption fine-structure (XAFS) spectroscopy have been used to induce structure disorder through the interaction of γ-rays (200 kGy) with fabricated Mn-doped ZnO nanoparticles (NPs) and then to examine thoroughly the resultant structural change. The extracted electronic/fine XAFS structural parameters reflect a compositional and γ-irradiation co-dependence. The average crystal structure of samples prepared by the sol-gel method was investigated by X-ray diffraction (XRD). A detailed structural XRD data analysis was carried out by applying a Rietveld refinement using the MAUD program. XAFS spectra were collected at the Zn K-edge (9659 eV) in transmission mode and at the Mn K-edge (6539 eV) in fluorescence mode. Direct evidence of the solubility of Mn ions in the ZnO structure was demonstrated by fitting the extended-XAFS (EXAFS) signal. Near-edge XAFS (XANES) analysis provided the oxidation states of Zn and Mn ions through fingerprint XANES spectra of the sample along with those of standard compounds. Linear combination fitting showed that the most fit chemical forms of Zn and Mn in the samples are ZnO and MnO, respectively. The oxidation states of both Zn and Mn XAFS absorbers were confirmed from pre-edge fitting. The results of the magnetic measurements were explained in light of the average and electronic/local structural information obtained from XRD, XANES and EXAFS techniques. The magnetic properties of the samples translate into an induced change in the average crystal and electronic/local structures upon Mn concentration change and γ-irradiation. XRD confirmed the successful preparation of hexagonal Mn-doped ZnO NPs with a crystallite size in the range 33–41 nm. Both XRD and EXAFS analysis detected a minor amount of Mn3O4 as a secondary phase. XANES and EXAFS provided information exploring the outstanding potential of the utilized protocol for detecting precisely the presence of the secondary phase of Mn3O4, which changes with Mn content (x). Mean-square relative displacement (σ2) values extracted from the EXAFS fitting were found to grow for Zn–Zn/Mn paths demonstrating the substitution of Mn/Zn into Zn crystal sites. The EXAFS analysis explains the reasons behind the enhancement in the magnetic properties and shows that the Mn doping content at x = 0.05 produces the most local atomic disorder in ZnO NPs. There is a strong harmony among the XRD, XANES, EXAFS and magnetization behavior of the Mn-doped ZnO NPs. Maximum magnetization was acquired at an Mn content of 0.05. γ-Ray-irradiated Zn1–x Mn x O NPs are recommended as optimized candidates for showing the diversity of the applications.

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“…At 500 ℃ annealing temperature, Yang et al [10] have observed good emission properties with fewer defects. Kazemi et al [11] have investigated the significant role of complexing agents on the structural and optical properties of ZnO nanoparticles with annealing treatment. However, the systematic study of the influence of annealing treatment on the structural and optical properties of ZnO nanoparticles with citric acid and polyvinyl alcohol as chelating agents has few reports.…”

Section: Introductionmentioning

confidence: 99%

Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

Mallika

Reddy

2015

J Adv Ceram

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Abstract:The effects of annealing temperatures and chelating agents on the structural and optical properties of ZnO nanoparticles were investigated. The average particle size of ZnO nanoparticles increased with increase of annealing temperatures. The decrease of the full width at half maximum (FWHM) with increasing annealing temperatures inferred increase of particle/grain growth. The grain sizes were also observed to be increased with increase of annealing temperatures. From the absorption spectra of the samples, the absorption was red-shifted and the energy band gap was blue-shifted with increase of annealing temperatures. A sharp UV emission peak was observed and the intensity of this peak increased with annealing temperatures corresponding to the high crystallinity in the samples. At high annealing temperature of 700 ℃, ZnO exhibited a less intense deep level emission. This negligible deep level emission was attributed to the oxygen vacancies created at higher annealing temperatures.

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Controlled structural and optical properties of ZnO nano-particles

Cited by 9 publications

References 23 publications

Effect of Mn Doping Concentration on Structural, Morphological and Optical Studies of ZnO Nano-particles

Effect of Mn Doping Concentration on Structural, Morphological and Optical Studies of ZnO Nano-particles

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

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