Analysis of electrical measurements oncadmium chloridedoped PVA-PVP blend

Baraker, Basavarajeshwari M.; Lobo, Blaise

doi:10.12723/mjs.40.4

Cited by 12 publications

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“…The electrical conductivity ( σ ) of the films was found to increase exponentially with temperature in the studied temperature range ( Table 3 ), according to the known law [ 44 , 45 , 46 , 47 ]:

where E a denotes the activation energy for d.c. conductivity, σ 0 is a characteristic parameter, which depends on the nature of the sample, and k B represents the Boltzmann’s constant.…”

Section: Resultsmentioning

confidence: 97%

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Structural, Electrical and Optical Properties of Pyrrolo[1,2-i][1,7] Phenanthroline-Based Organic Semiconductors

et al. 2022

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This work reports a study on structural, electrical and optical properties of some recently synthesized pyrrolo[1,2-i][1,7] phenanthrolines derivatives in thin films. The thin films were deposited onto glass substrates by spin coating technique, using chloroform as solvent. The obtained films exhibited a polycrystalline structure with an n–type semiconductor behavior after heat treatment in the temperature range 293–543 K, specific to each sample. The thermal activation energy lies between 0.68 and 0.78 eV, while the direct optical band gap values were found in the range 4.17–4.24 eV. The electrical and optical properties of the investigated organic semiconductor films were discussed in relation to microstructural properties, determined by the molecular structure. The investigated organic compounds are promising for applications in organic optoelectronics and nanoelectronics.

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where E a denotes the activation energy for d.c. conductivity, σ 0 is a characteristic parameter, which depends on the nature of the sample, and k B represents the Boltzmann’s constant.…”

Section: Resultsmentioning

confidence: 97%

“…Additionally, in temperature range of the extrinsic conduction regime ( T < T c ), it signifies the energy of donor levels relative to the CB bottom, or that of the acceptor levels relative to the VB top, respectively [ 44 , 45 , 46 ].…”

Section: Resultsmentioning

confidence: 99%

Structural, Electrical and Optical Properties of Pyrrolo[1,2-i][1,7] Phenanthroline-Based Organic Semiconductors

et al. 2022

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“…This decrease in the value of bulk conductivity with an increase in dopant concentration is due to reduction in the concentration of available ions for conduction or transportation. This is due to interaction between the dopant (CdCl 2 ) and the polymer molecules (PVA/PVAc-PVP), there is a reduction of Cd 2+ ions into Cd atoms; because of this, there are selfgrown nano-structures and micro-structures formed in the sample, followed by a percolation threshold at lower, moderate and higher dopant levels, respectively, of CdCl 2 in the polymeric blend; this has been observed from DC electrical measurements as well as dispersion parameters (from optical studies) [58,59]. In figure 11d, larger values of dielectric constant and dielectric loss are observed for 0.5 and 2.2 wt% samples; it is in these samples that Cd nano-spheres and Cd nano-rods are found; here, the polarization of O − , H + , Cd 2+ and Cl − ions increase the interface area and so, there are more number of available charge carriers at low frequencies.…”

Section: 2e Dopant Concentration-dependent Dielectric Propertiesmentioning

confidence: 87%

Dielectric relaxation in a cadmium chloride-doped polymeric blend

Baraker

Lobo

2019

Bull Mater Sci

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The temperature-and frequency-dependent relaxation processes in films of a polymeric blend comprising a polyvinyl alcohol (PVA)/polyvinyl acetate (PVAc) co-polymer blended with polyvinyl pyrrolidone (PVP) in equal proportion by weight, and doped with an inorganic metallic salt, cadmium chloride (CdCl 2), at 0.0 wt% and 10.2 wt% doping levels (DLs), have been studied using dielectric relaxation spectroscopy (DRS). The frequency response of dielectric parameters for these samples has been studied with variation in temperature, from 303 up to 373 K, at different fixed frequencies (from 12 Hz up to 200 kHz). Study of Cole-Cole plots reveals a decrease in bulk resistivity of the samples with increase in temperature, which is attributed to thermally induced increase in the mobility of polymer chains. A 10-fold increase in bulk conductivity is observed for doped films with a DL of 10.2 wt%, when compared with the bulk conductivity of the un-doped (0.0 wt% DL) sample. The temperature dependence of dielectric parameters at different frequencies has been studied and the activation energy has been calculated. The relaxation time is found to be of the order of a few milliseconds, which implies that electrical conduction in CdCl 2-doped PVA/PVAc-PVP blend films is predominantly due to the migration of ions. The variation of AC conductivity with frequency is in agreement with Jonscher's universal power law. AC conductivity of the sample is found to increase significantly with an increase in temperature of the sample. Frequency-dependent dielectric properties of CdCl 2-doped PVA/PVAc-PVP blend films, for various DLs, are also studied at room temperature.

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“…Figure 5, shows the absorption peaks and deconvolution plots performed using a Gaussian function in the range 400-2000 cm −1 , the positions of absorption bands at different calcination temperatures are depicted in table 1. The absorption peaks detected in all spectra in the range (3429.090-3462.588 cm −1 ) and 2328.141 cm −1 correspond to the stretching vibration of the intermolecular hydrogen bond (O-H), and O=C=O vibration in the air, respectively [42,43]. The peak band at (1628.9-1660.56 cm −1 ) is a characteristic of the Bi(Pb):2212 phase [44,45].…”

Section: Effect Of Thermal Treatmentmentioning

confidence: 88%

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

et al. 2022

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This investigation reports the effect of the addition of CdO nanoparticles on the (Bi,Pb)-2212 superconducting phase. The superconducting samples of general formula (CdO)x Bi1.6 Pb0.4 Sr1.9 Ca1.1Cu2.1 O8 (x = 0.00, 0.01, 0.02, 0.05, and 0.1 wt%) are synthesized using the conventional solid-state reaction technique. Powder X ray diffraction analysis confirms the formation of a single-phase orthorhombic Bi-2212. The variations in the lattice parameters are explained based on the Jahn Teller distortion induced by the increase in the oxygen content owing to the addition of the CdO nanoparticles. The increase in the oxygen content is confirmed via Idiometric titration analysis. The grain morphology is investigated using scanning electron microscopy (SEM). The effect of CdO addition in enhancing grains connectivity by the filing of pores and voids is revealed. Fourier transform infrared (FTIR) spectroscopy is conducted to analyze the functional groups, based on the effect of calcination temperature and CdO addition. Dc-electrical resistivity measurements and I-V characteristics show an enhancement of the superconducting transition temperature (Tc) and the critical current density (Jc) with CdO addition up to x=0.05 wt%, followed by a further decrease. By analyzing the results of the X-ray photoelectron spectroscopy (XPS), the variations of the superconducting properties are explained based on the preferred substitution of Pb2+ ions in the Bi3+ or Cu2+ sites induced by the variations in the oxygen content generated by the addition of CdO nanoparticles.

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Analysis of electrical measurements oncadmium chloridedoped PVA-PVP blend

Cited by 12 publications

References 0 publications

Structural, Electrical and Optical Properties of Pyrrolo[1,2-i][1,7] Phenanthroline-Based Organic Semiconductors

Structural, Electrical and Optical Properties of Pyrrolo[1,2-i][1,7] Phenanthroline-Based Organic Semiconductors

Dielectric relaxation in a cadmium chloride-doped polymeric blend

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

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