Frequency dependence of ultrahigh dielectric constant of novel synthesized SnO2 nanoparticles thick films

Chenari, Hossein Mahmoudi; Hassanzadeh, Akbar; Golzan, Mir Maqsood; Sedghi, H.; Talebian, M.

doi:10.1016/j.cap.2010.08.011

Cited by 43 publications

(7 citation statements)

References 30 publications

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“…The calculated capacitance values of NPs varied from 0.527 (nf) to 169 × 10 6 (nf) for Al-doped ZnO NPs, and from 73.6 (nf) to 1.54 × 10 7 (nf) for Mn-substituted Al-doped ZnO NPs. Obtained capacitance values of 10 8 nf (= 0.1 F) are in good agreement with the literature [40].…”

Section: Dielectric Properties 321 Impedance Measurementssupporting

confidence: 87%

“…The existence of ionic vibrations associated with space charge polarization leads to frequency-independent behaviour at higher frequencies [54]. The presence of defects such as vacancies in the samples results in the constitution of significant numbers of electric dipole moments and poor ionic bonds (ion-vacancy pairs) [40]. J E Jaffe et al [62] noted that photocatalytic activity is associated with surface properties such as oxygen deficiency, hydroxyl attachments, and area.…”

Section: Magnetic Studies (Using Impedance Measurement)mentioning

confidence: 99%

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Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Norouzzadeh

Golzan²,

Mabhouti³

et al. 2020

Nanotechnology

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In this study, the role of Mn-substitution on the structural, morphological, dielectric, and magnetic properties of Al-doped ZnO nanoparticles has been examined, using XRD, FE-SEM, µAutolab/FRA2 impedance spectroscopy, and vibrating sample magnetometer (VSM) techniques. Structural investigations revealed diffraction peaks consistent with JCPDS card No. 036-1451. Morphological evaluations of the synthesized nanoparticles indicated that the shape of the nanoparticles is a slightly hexagonal and generally spherical structure with a size range of approximately 10-70 nm. Dielectric measurements were performed in frequency ranges between 10 −3 Hz and 1 MHz. The results show that the sample's dielectric behavior is affected both by crystallite size and doping material type. In addition, it can be observed that the dielectric parameters exhibit extreme frequency dependence. Mn-substituted Al-doped ZnO is a suitable candidate for high-frequency applications due to its low dielectric loss at high frequencies. The AC conductivity of the Mn-substituted Al-doped ZnO sample increases with each frequency increment, and its value is higher than for the Al-doped ZnO sample, makings it a desirable material for use in device applications. Magnetic calculations, extracted from dielectric impedance spectroscopy measurements, are also investigated. Complex magnetic permeability, together with magnetic loss curves, are also plotted. Finallly, a study of the magnetic properties of the sample, using VSM, showed room-temperature ferromagnetic behavior.

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Section: Dielectric Properties 321 Impedance Measurementssupporting

confidence: 87%

Section: Magnetic Studies (Using Impedance Measurement)mentioning

confidence: 99%

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Norouzzadeh

Golzan²,

Mabhouti³

et al. 2020

Nanotechnology

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“…Sagadevan et al [43] concluded that dielectric constant increases with decreasing frequency and Ionic, dipolar, electronic, and space charge polarisation are responsible for this kind of behaviour. Chenari et al [44] investigated the electrical properties of SnO 2 based thin films and explain the electro-transport behaviour in…”

Section: Dielectric Studies 371 Dielectric Measurementsmentioning

confidence: 99%

Structural, optical, and dielectric characteristics of pulsed laser deposited SnO₂-TiO₂ composite thin films

et al. 2023

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Pulsed laser deposition was used to fabricate the thin films of SnO2 and SnO2-TiO2 composites on FTO substrates and these films were characterized to understand the effect of TiO2 on the structural, optical, and electrical properties of SnO2. The crystalline nature, phase purity, and optical bandgap were determined using X-ray diffraction and UV-Vis measurements, respectively. The Tauc plots confirm that the composite films have a higher band gap energy than SnO2. EDX spectra demonstrate that the thin films contain Ti, Sn, and O ions. The photoluminescence (PL) spectra indicate three blue emission bands at wavelengths of 410, 435, and 460 nm and these are due to the oxygen vacancies or interstitial oxygen ions and defect related states formed during the thin-film deposition of SnO2 and composites. These films are n-type semiconductors as verified by the Hall Effect measurements. At the interface of the film, the frequency dependence of the dielectric at room temperature reveals that as the frequency increases, the dielectric constant and dielectric losses decrease. SnO2 film has a significantly higher a.c. conductivity than the SnO2-TiO2 composite films. The correlated barrier hopping (CBH) mechanism is responsible for the conduction behaviour and obeys Johncher's power law (n<1). Both films exhibit a frequency-dependent increase in impedance. The addition of TiO2 in SnO2 affects the structural, optical, dielectric, and ac conductivity of films at room temperature. These optical and n-type semiconducting nature supports the potential application in microelectronics, optoelectronics, and sensor applications.

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“…For UC-SnO 2 decrease in the values of dielectric constant with respect to frequency was found at different temperatures. The decrease in dielectric constant with frequency is an obvious fact as any entity contributing towards polarization lags behind the applied filed at higher frequencies [38,39]. The frequency dependency of dielectric constant is explained on the basis of Maxwell-Wager model.…”

Section: Dielectric 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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Frequency dependence of ultrahigh dielectric constant of novel synthesized SnO2 nanoparticles thick films

Cited by 43 publications

References 30 publications

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Structural, optical, and dielectric characteristics of pulsed laser deposited SnO₂-TiO₂ composite thin films

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

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Frequency dependence of ultrahigh dielectric constant of novel synthesized SnO2 nanoparticles thick films

Cited by 43 publications

References 30 publications

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

Structural, optical, and dielectric characteristics of pulsed laser deposited SnO2-TiO2 composite thin films

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

Contact Info

Product

Resources

About

Structural, optical, and dielectric characteristics of pulsed laser deposited SnO₂-TiO₂ composite thin films

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