Structural, dielectric and magnetic properties of (Al, Ni) co-doped ZnO nanoparticles

Khan, Rajwali; Fashu, Simbarashe; Rehman, Zia ur

doi:10.1007/s10854-016-6058-0

Cited by 27 publications

(5 citation statements)

References 40 publications

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“…Metal oxide semiconductors such as TiO 2 , SnO 2 , In 2 O 3 , and ZnO are known to exhibit DMS behavior as a result of TM-doping [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Thanks to its fascinating features, such as large energy bandgap E g (≈3.37 eV), relatively great exciton binding energy (≈60 meV), high electrical conductivity, as well as high temperature magnetic response [ 24 , 25 , 26 ], ZnO material is a II-VI binary semiconducting material and is considered to be one of the best candidates for the modern electronic industry. ZnO crystallizes in three main crystallographic varieties—namely, wurtzite, zinc blend, and rock salt.…”

Section: Introductionmentioning

confidence: 99%

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

et al. 2020

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Undoped as well as (Co, Mn) co-doped Zinc oxides have been effectively developed on glass substrates, taking advantage of the spray pyrolysis procedure. The X-ray diffraction XRD as well as X-ray photoelectron spectroscopy (XPS) measurements have recognized a pure hexagonal wurtzite form of ZnO, and no other collateral phases such as MnO2 or CoO2 have been observed as a result of doping. The calculated values of the texture coefficient (TC) were between 0.15 and 5.14, indicating a dominant orientation along the (002) plane. The crystallite size (D) varies with the (Co, Mn) contents. The dislocation density (δ) as well as the residual microstrains increased after Co and Mn doping. Furthermore, the surface morphology of the films has been affected significantly by the Co and Mn incorporation, as shown by the scanning electron microscopy (SEM) investigation. The study of the optical properties exhibits a red shift of the band gap energy (Eg) with the (Co, Mn) co-doping. The magnetic measurements have shown that the undoped and (Co, Mn) co-doped ZnO thin films displayed room-temperature ferromagnetism (RTFM).

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Section: Introductionmentioning

confidence: 99%

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

et al. 2020

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“…Although the systems were excited above their band gap, no band edge emission was observed. The broad emission thus shows the presence of non-radiative states below the conduction band which can be due the presence of defects like Sn-interstitials, oxygen-interstitials and surface defects [33][34][35][36]. In metal oxide nanoparticles oxygen vacancies are the most prominent defects.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Preparation and characteristic analysis of carbon coated nanoscale SnO₂ system: an integrated experimental and first principles approach

Shukla¹,

Chetri²,

Ahmed³

2022

Phys. Scr.

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A successful preparation of carbon coated (CC- SnO2)and uncoated (UC- SnO2) nanoscale SnO2 is achieved via cost-effective physicochemical method employing polyvinyl alcohol (PVA) as the source of carbon. The idea of coating with carbon is to reduce agglomeration and investigate single particle properties. The resulting phase compositions of UC- and CC- SnO2 is characterized by XRD, Raman, TEM, UV-Vis, photoluminescence, dielectric- spectroscopy and conductivity measurement. The carbon coated SnO2 finds advancement in its characteristic properties with versatility, like phase and material stability, increase in activation energy and reduction in agglomeration formation. The prepared CC- SnO2 suppresses the natural mode of vibration of SnO2 nanoparticles. Dielectric spectroscopy measurements show that the dielectric loss is more in UC- SnO2 than CC- SnO2 at all frequencies. The existence of carbon coating on SnO2 nanoparticles and its phenomenal characterizing behavior was verified by first- principles approach with investigation of the structural and electronic properties of SnO2, PVA, and their merged structures. A model has been used to observe the surface interaction effect between SnO2 and PVA for a defined geometry elucidated through variations in the density of states results. The reported method and investigations approached through the integrated technique provides conspicuous enrichment to the field. Keywords: oxides; coatings; dielectric properties; first principles.

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“…The decrease of imaginary part of dielectric constant is due to the space charge polarization occurring at higher frequencies. [64] The phase difference, with the applied field leading to the drop in the dielectric value, is known as loss factor tangent [65] tan δ = ε /ε . (8) 048202-6 The variations of loss tangent with log frequency in Fig.…”

Section: Conductivity Studies 41 Impedance Analysismentioning

confidence: 99%

“…It is also observed that dielectric loss decreases with Fe doping concentration increasing, hence Fe doping concentration above the solubility limit in SnO 2 can get a material suitable for high frequency applications. [64] The variations of alternating current (AC) conductivity with log frequency for SnO 2 and 5-wt% and 10-wt% Fe-doped SnO 2 are shown in Fig. 14.…”

Section: Conductivity Studies 41 Impedance Analysismentioning

confidence: 99%

Grain boundary effect on structural, optical, and electrical properties of sol–gel synthesized Fe-doped SnO₂ nanoparticles

Archana

Mohan

Kathirvel³

et al. 2021

Chinese Phys. B

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Tin oxide (SnO2) and iron-doped tin oxide (Sn1 – x Fe x O2, x = 0.05 wt%, 0.10 wt%) nanoparticles are synthesized by the simple sol–gel method. The structural characterization using x-ray diffraction (XRD) confirms tetragonal rutile phases of the nanoparticles. The variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the lattice. The compressive strain present in the lattice estimated by using peak profile analysis through using Williamson–Hall plot also exhibits the influence of grain boundary formation in the lattice. The radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum (PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary influence. Raman spectrum and the morphological analysis by using a field emission scanning electron microscope (FESEM) also indicate the formation of grain boundaries. The compositional analysis by using energy dispersive x-ray spectrum (EDAX) confirms Fe in the SnO2 lattice. The conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing, which makes the Sn1 – x Fe x O2 a potential candidate for device applications.

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Structural, dielectric and magnetic properties of (Al, Ni) co-doped ZnO nanoparticles

Cited by 27 publications

References 40 publications

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Preparation and characteristic analysis of carbon coated nanoscale SnO₂ system: an integrated experimental and first principles approach

Grain boundary effect on structural, optical, and electrical properties of sol–gel synthesized Fe-doped SnO₂ nanoparticles

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Structural, dielectric and magnetic properties of (Al, Ni) co-doped ZnO nanoparticles

Cited by 27 publications

References 40 publications

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Physical Investigations of (Co, Mn) Co-Doped ZnO Nanocrystalline Films

Preparation and characteristic analysis of carbon coated nanoscale SnO2 system: an integrated experimental and first principles approach

Grain boundary effect on structural, optical, and electrical properties of sol–gel synthesized Fe-doped SnO2 nanoparticles

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Preparation and characteristic analysis of carbon coated nanoscale SnO₂ system: an integrated experimental and first principles approach

Grain boundary effect on structural, optical, and electrical properties of sol–gel synthesized Fe-doped SnO₂ nanoparticles