Dielectric and AC conductivity studies of CdSe nanocrystals doped sol–gel silica matrices

Poly(vinylpyrrolidone) (PVP) complexed with sodium iodide (NaI) is synthesized to investigate the ionic conductivity of alkaline-based polymer electrolytes. In this article, we report the modification of electrical properties of a new ion-conducting polymer electrolyte, namely, PVP complexed with NaI. Modification of polymer electrolyte was carried out before and after the exposure of films by bombarding them at different fluences with respect to Li3+ ion beam at 60 MeV. The preparation and detailed characterization of PVP:NaI is being reported. Further, a correlation with conductivity and dielectric constant has also been established. The modulation in the conductivity is explained in terms of number of charge carriers ( n) and its mobility ( μ), which confirms the behavior of the polymer electrolyte as an alternative strategy to improve the conductivity.

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“…As a result, the power law dispersion in ε ″ is observed, and it does not reveal any peak in the measured frequency range. 28…”

Section: Resultsmentioning

confidence: 99%

Conductivity and dielectric studies of Li³⁺-irradiated PVP-based polymer electrolytes

Singh

Kanjilal

Laxmi

et al. 2018

High Performance Polymers

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“…Hopping of small polarons between different valence states of these elements can be considered as the cause of conduction in these glasses [7]. The electrical conductivity of various glasses containing TMI has been investigated by many researchers [2,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Electrical Relaxation Studies of Chalcogenide xAg2S–(1-x) (0.5S–0.5Te) Glassy System

Ojha¹,

Roy²,

Chamuah³

et al. 2020

IJASE

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“…Alternatively, it is attractive to study the electrical behavior of these materials in ac fields in order to provide details regarding the transport process in the localized state of the forbidden gap (Long 1982). Dielectric measurements and ac conductivity have been discussed in the context of a wide variety of materials in order to appreciate the mechanisms of conduction processes in these materials (Abdel-All 1998; Bitar and Arafah 1998;Sedeek et al 2003;Redwan et al 2003;Seyam 2001;Jyothy et al 2010;Ram et al 2013;Atiya 2014) [2][3][4][5][6][7][8][9]. In fact, frequency-dependent electrical conductivity (σ ac ) of semiconductor composites is a helpful tool to understand the conduction mechanism in their respective alloys.…”

Section: Introductionmentioning

confidence: 99%

YBCO as a transition metal oxide ceramic material for energy storage

et al. 2019

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Background: Dielectric properties and ac conductivity were studied and correlated with the structure of a series of YBCO ceramic, doped with different doping levels ranging from 0.1 to 0.5 wt.% of magnetic nano-metal oxides, namely Mn 3 O 4 , Co 3 O 4 , and Cr 2 O 3. The most important feature of this study was the ultrahigh values of dielectric constants at a low frequency, exactly 50 Hz. We found that the undoped YBCO has a value of ε′ equal to 6.99 × 10 6 at 50 Hz at room temperature which was increased to 1.09 × 10 8 at 120°C, higher than any other ferroelectric material. Moreover, the value of ε′ depends on the nature and the value of the magnetic moment of the doped metal oxides. The value of ε′ is at least three orders of magnitude greater than any previously studied composites which suggest that this perovskite ceramic material can be used to create electrostatic capacitors with energy far better than the best electrode doublelayer capacitors (EDLC). Additionally, ac electrical conductivity has two frequency-dependent regions, the low frequency, where σ ac is independent of frequency, and the high-frequency region where dispersion occurs. The ac conductivity measurement with frequency leads us to conclude that the conduction mechanism in the studied samples can be correlated barrier hopping (CBH) model. Results: The dielectric properties of undoped YBCO ceramics at 50 Hz in temperature ranging from room temperature to 120°C were studied. It is obvious that the dielectric constant and dielectric loss of YBCO decrease with increase in frequency and temperature. It can be noticed that dielectric constant of YBCO increases at 50 Hz from 6.99 × 10 6 at room temperature to 1.09 × 10 8 at 120°C. The high values of ε′ recorded for YBCO doped with Mn 3 O 4 varied from 9.45 × 10 5 to 15.5 at room temperature and 1.34 × 10 5 to 9.242 at 1 MHz at 120°C. For doped YBCO with Co 3 O 4, the values of ε\ varied from 9.5 × 10 5 at 50 Hz to 13.24 at 1 MHz at room temperature, with changes from7.8 × 10 4 at 50 Hz to 53.42 at 1 MHz. For YBCO ceramic samples doped with Cr 2 O 3, ε′ varied from 1.138 × 10 6 at 50 Hz to 8.38 × 10 3 at 1 MHz at room temperature and from 5.935 × 10 5 at 50 Hz to 3.53 × 10 3 at 1 MHz at 120°C. The ac conductivity was further studied for undoped YBCO and doped YBCO with 0.1 wt.% of nano-metal oxide of Cr 2 O 3 , Co 3 O 4 , and Mn 3 O 4 samples. For all the studied samples, we found σ ac is typically specified to the hopping conduction and ac conductivity has a power law behavior in terms of frequency (ω). In general, there are two frequency-dependent regions for all the studied ceramic samples; in the low-frequency region, σ ac is independent of frequency whereas in the high-frequency region, dispersion occurs. The change in microwave conductivity of the studied samples with frequency (1-5 MHz) is shown in Fig. 5. It is observed that for all samples, the conductivity increases with temperatures and depends on the doped metal oxide. The values of σ ac at 5 MHz varied from − 0.4 to 1.2 for undoped YBC...

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Dielectric and AC conductivity studies of CdSe nanocrystals doped sol–gel silica matrices

Cited by 19 publications

References 23 publications

Conductivity and dielectric studies of Li³⁺-irradiated PVP-based polymer electrolytes

Conductivity and dielectric studies of Li³⁺-irradiated PVP-based polymer electrolytes

Electrical Relaxation Studies of Chalcogenide xAg2S–(1-x) (0.5S–0.5Te) Glassy System

YBCO as a transition metal oxide ceramic material for energy storage

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Dielectric and AC conductivity studies of CdSe nanocrystals doped sol–gel silica matrices

Cited by 19 publications

References 23 publications

Conductivity and dielectric studies of Li3+-irradiated PVP-based polymer electrolytes

Conductivity and dielectric studies of Li3+-irradiated PVP-based polymer electrolytes

Electrical Relaxation Studies of Chalcogenide xAg2S–(1-x) (0.5S–0.5Te) Glassy System

YBCO as a transition metal oxide ceramic material for energy storage

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Conductivity and dielectric studies of Li³⁺-irradiated PVP-based polymer electrolytes

Conductivity and dielectric studies of Li³⁺-irradiated PVP-based polymer electrolytes