Rietveld refinement of X-ray diffraction, impedance spectroscopy and dielectric relaxation of Li-doped ZnO-sprayed thin films

Salah, Mohamed; Azizi, Samir; Boukhachem, A.; Khaldi, Chokri; Amlouk, M.; Lamloumi, J.

doi:10.1007/s00339-019-2911-3

Cited by 30 publications

(10 citation statements)

References 145 publications

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“…Z ″ gradually reduces with the increase in the frequency, and for 300 and 400 °C, it almost vanishes to zero. This reduces the pattern of Z ′ with the increase in both frequency and temperature, reflecting the semiconductor behavior of the sample . The decrease of the Z ′ and Z ″ values with the enhancement in the temperature suggests the reduction of grain and grain boundary resistance .…”

Section: Results and Discussionmentioning

confidence: 94%

“…This reduces the pattern of Z′ with the increase in both frequency and temperature, reflecting the semiconductor behavior of the sample. 64 The decrease of the Z′ and Z″ values with the enhancement in the temperature suggests the reduction of grain and grain boundary resistance. 65 Again, the shift of Z′ toward the lower frequency with an increase in the temperature also confirms the frequency relaxation process in sample.…”

Section: Optical Studymentioning

confidence: 99%

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A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

Das¹,

Senapati²,

Pradhan

et al. 2023

ACS Appl. Nano Mater.

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Transition metal chalcogenides have gained significant attention for their optoelectronic and electrical applications in various fields due to their elemental composition-dependent tunable properties. Here, a facile microwave-assisted approach was used to synthesize different CuSe1–x Te1+x -based nanomaterials. By varying the Se and Te concentrations, the morphology of CuSe1–x Te1+x was tuned from nanosheet-based flowers to nanospheres. With the increase in the value of the Te-to-Se content ratio, the material shows the transition from mixed nanosheets/nanospheres to pure nanospheres, where the average sheet thickness and sphere diameter are ∼25 and 80 nm, respectively. The as-synthesized material shows high crystallinity with mixed phases of hexagonal Cu2Te and CuSe. The chemical bonding of the material exhibits shifts of the spectra toward lower binding energies with the decrease in the Se-to-Te ratio. The material exhibits a change in the absorption edge with a blue shift of the optical bandgap for the increase of the Te content. The increment in the absorption makes them eligible for solar cell application. The photoluminescence spectra of different CuSeTe samples show broad emission in the 550–950 nm range with a peak at ∼700 nm. Such optical properties enable CuSeTe materials for possible applications in optoelectronic devices. The dielectric measurement of the sample exhibits an increase in the dielectric constant and loss with temperature, whereas a decrease in both the values is apparent for increase in the frequency. The dielectric study of the material reveals its potential application for energy storage. The photo-response study demonstrated that the material can be employed for photodetector application.

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Section: Results and Discussionmentioning

confidence: 94%

Section: Optical Studymentioning

confidence: 99%

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

Das¹,

Senapati²,

Pradhan

et al. 2023

ACS Appl. Nano Mater.

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“…The magnitude of ( ¢ Z ) decreases with temperature for all compositions shows NTCR behaviour. The merging of all curves at selected temperatures in the higher frequency sides is due to the release of space charge and a resulting depressing potential barrier [60,[62][63][64]. Moreover, the decreasing impedance values with Cd contents indicate improved ac conductivity with frequency compared to pure ZnO.…”

Section: Morphological Analysismentioning

confidence: 94%

Structural, impedance, dielectric and optical characteristics of Cd- substituted Zn_(1−x)Cd_xO nanoparticles at low temperatures

Ahmad¹,

Maqsood²

2021

Phys. Scr.

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Nanocrystalline Cd substituted ZnO nanoparticles with common formula Zn (1-x) CdxO (x = 0%, 3%, 6%, and 10%) were fabricated by a co-precipitation technique. X-ray diffraction (XRD) and scanning electron microscopy (SEM) was used to investigate the microstructures and morphology of synthesized nanoparticles at room temperature. The outcome of the x-ray diffraction (XRD) study supports the existence of wurtzite crystal structure for ZnO, and Cd substituted ZnO samples conformed that substituted Cd ions are catching up Zn site. The morphological assessments of the fabricated nanoparticles indicated that the nature of the nanoparticles is a slightly hexagonal and mostly spherical shape with size ranges 46-55 nm. The electric impedance of the samples was measured in a wide range of frequency 100Hz–2MHz at different temperatures (140 K-260 K) using an LCR meter. It was observed that the dielectric constants (ἐ), (ε´´), loss tangent (tanδ), and ac conductivity of pure and Cd substituted ZnO nanoparticles depended on frequency. The calculations of dielectric measurement showed that the parameters (ἐ), (ε´´), loss tangent (tanδ) decreased with the increase in frequency. But the ac conductivity enhanced with the frequency, whereas the values of the above parameters increased with the temperature rise. The dielectric parameters are also found to improve with the increase in Cd concentrations. The correlated barrier-hopping (CHB) model dominated in ac conductivity. The reduction in the bandgap was also observed with Cd concentration.

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“…An increase in the compressional strain has been reported by Siddique et al with increasing Ni doping (achievement of interstitial sites) level with ZnO [66]. Besides the WH analysis, particle size and strain can also be estimated from size-strain plots [67], using Rietveld refinement of x-ray diffraction [68], etc. table 2 shows the structural parameters of ZnO NPs obtained from the XRD data.…”

Section: Structural Properties 311 Xrd Studiesmentioning

confidence: 97%

Structural, optical, and antibacterial properties of Li-doped ZnO nanoparticles synthesized in water: evidence of incorporation of interstitial Li

Mukherjee¹,

Pramanik²,

Das³

et al. 2022

Phys. Scr.

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The mode of incorporation of lithium (Li) (as substitution or interstitial position) in zinc oxide (ZnO) has its own importance as far as the potential applications of Li-doped ZnO nanoparticles (NPs) are concerned. Fabrication of p-type ZnO based semiconductors as well as defect engineering based applications demand substitution of Zn2+ by Li+. However, doping of ZnO by Li with interstitial positions can play an important role in controlling the different properties of it. In the present study, we report the successful doping of Li in ZnO NPs up to a Li concentration of 10 mol% employing a simple wet chemical precipitation method in water. Up to a Li concentration of 8 mol%, doping by substitution of Li to the Zn sites have been observed. However, for 10 mol% of Li concentration, doping by incorporation of interstitial sites in addition to the substitution have been confirmed through the complementary characterization techniques. The effects of interstitial Li in ZnO on structural, optical, and antimicrobial properties have been studied in details systematically. For all the cases (structural, optical, and antimicrobial), the properties of Li-doped ZnO NPs have been changed reversibly in the ZnO NPs after incorporation of interstitial sites by Li as compared to the substitution of Li. For example, the microstrain, band gap, and antimicrobial activity have been found to increase with increase in Li concentration up to 8 mol%. However, the microstrain, band gap, and antimicrobial activity are found the decrease for 10 mol% of Li as compared to 8 mol% of Li. This study indicated that the different properties of Li-doped ZnO NPs can be controlled suitably as per the requirements for the practical applications of ZnO based materials.

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Rietveld refinement of X-ray diffraction, impedance spectroscopy and dielectric relaxation of Li-doped ZnO-sprayed thin films

Cited by 30 publications

References 145 publications

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

Structural, impedance, dielectric and optical characteristics of Cd- substituted Zn_(1−x)Cd_xO nanoparticles at low temperatures

Structural, optical, and antibacterial properties of Li-doped ZnO nanoparticles synthesized in water: evidence of incorporation of interstitial Li

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Rietveld refinement of X-ray diffraction, impedance spectroscopy and dielectric relaxation of Li-doped ZnO-sprayed thin films

Cited by 30 publications

References 145 publications

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe1–xTe1+x for Optoelectronic and Dielectric Applications

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe1–xTe1+x for Optoelectronic and Dielectric Applications

Structural, impedance, dielectric and optical characteristics of Cd- substituted Zn(1−x)CdxO nanoparticles at low temperatures

Structural, optical, and antibacterial properties of Li-doped ZnO nanoparticles synthesized in water: evidence of incorporation of interstitial Li

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Product

Resources

About

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

A Facile Microwave-Assisted Nanoflower-to-Nanosphere Morphology Tuning of CuSe_1–xTe_1+x for Optoelectronic and Dielectric Applications

Structural, impedance, dielectric and optical characteristics of Cd- substituted Zn_(1−x)Cd_xO nanoparticles at low temperatures