Preparation and electrical and dielectric characterization of PVA/PPY blends

Oliveira, Helinando Pequeno de; Santos, Marcus Vinicius Beserra dos; Santos, C.G. dos; Melo, Celso P. de

doi:10.1016/s1044-5803(03)00096-2

Cited by 47 publications

(20 citation statements)

References 4 publications

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“…3(a)-(c). The first trend is contributed by free charges available in the composite system whereas the second, which is frequency dependent conductivity, is due to trapped charges which are only active at higher frequency [23,24]. As shown in figure, 0% and 10% composites behave as a insulating phase and after further doping at higher concentration, samples show conductive behavior [16].…”

Section: Discussionmentioning

confidence: 94%

Radiation induced modification of dielectric and structural properties of Cu/PMMA polymer composites

Singh

Qureshi

et al. 2010

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 94%

Radiation induced modification of dielectric and structural properties of Cu/PMMA polymer composites

Singh

Qureshi

et al. 2010

Journal of Non-Crystalline Solids

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“…In addition, the interactions of a number of rare‐earth metal cations (Gd 3+ , Nd 3+ , Er 3+ , etc.) with other polymers have been studied, and the formation of complexes between the metal cations and the ligand groups of the polymers has been investigated 1–3, 14…”

Section: Resultsmentioning

confidence: 99%

“…The incorporation of metal salts into polar organic polymers can induce pronounced changes in various properties of the polymers 1–3. Frequency shifts and intensity changes in the infrared vibrations of polyamide (nylon 6) containing added metal halides4 and the changes in the spectra of several polymers doped with inorganic nitrates5 have been interpreted in terms of complex formation between the metal salts and specific functional groups of the polymers.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and alternating‐current conductivity of gadolinium‐doped poly(vinyl alcohol)

Hanafy

2008

J of Applied Polymer Sci

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The dielectric constant, dielectric loss factor, and alternating-current conductivity of Gd-doped poly(vinyl alcohol) (PVA) samples have been studied in the temperature and frequency ranges of 290-450 K and 50-5 3 10 6 Hz, respectively. Three relaxation processes-a a , a c , and q-have been obtained. The first one is due to the rotation of OH and C¼ ¼O groups inside the amorphous part of PVA. The second process is due to the dipole relaxation in the crystalline phase of the sample. The changes in the peak position and height of a a and a c have been interpreted in light of the formation of complexes between GdCl 3 and OH and C¼ ¼O groups of the PVA structure. On the other hand, the q-relaxation process is due to the space-charge formation between the different phases inside the PVA samples. Alternating-current conductivity measurements of the investigated samples have revealed that the hopping conduction mechanism is predominant. The maximum barrier height and the activation energy have been calculated and reported. In the low temperature range (306-333 K), the responsible conduction mechanisms of PVA doped with 2 or 4 wt % GdCl 3 have been found to be small polaron tunneling and quantum mechanical tunneling, respectively.

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“…The choice of polymeric dielectric materials for each case depends on its dielectric and physical properties over a wide range of temperature and electric field frequency [9]. Dielectric measurements such as ε', ε'' and tanδ are drastically affected by the presence of a dopant or dopants in the polymer [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…These changes in physical properties, depends on the chemical nature of the dopant and the way in which they interact with the host polymer [13][14][15][16]. The amount of doping is the determinant factor for the preparation of highly conducting polymeric samples, especially those at the metallic level of charge transport [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and dielectric properties of polyvinyl alcohol (Co, Zn Acetate) Fiber/n-Si and polyvinyl alcohol (Ni, Zn Acetate)/n-Si Schottky diodes

2011

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Dielectric properties and ac electrical conductivity (σ ac ) of Au/PVA(Co, Zn acetate)/n-Si and Au/PVA(Ni, Zn acetate)/n-Si Schottky diodes (SDs) have been investigated in dark and under illumination by using experimental capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements at 1 MHz and room temperature. Experimental results indicate that the change in dielectric constant (ε'), dielectric loss (ε''), loss tangent (tanδ), the real (M') and imaginary (M'') parts of electric modulus and ac electrical conductivity (σ ac ) with illumination were found to change linearly with illumination level (P). On the other hand, the ε', ε'', tanδ and σ ac vs P have positive slope while the M' and M'' vs P have negative slope. Such behavior of dielectric properties and σ ac can be attributed to illumination induced electron-hole pairs under illumination effect in the depletion region of SDs. The obtained results under illumination suggest that these devices can be used as a sensor in optical applications.

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Preparation and electrical and dielectric characterization of PVA/PPY blends

Cited by 47 publications

References 4 publications

Radiation induced modification of dielectric and structural properties of Cu/PMMA polymer composites

Radiation induced modification of dielectric and structural properties of Cu/PMMA polymer composites

Dielectric relaxation and alternating‐current conductivity of gadolinium‐doped poly(vinyl alcohol)

Preparation and dielectric properties of polyvinyl alcohol (Co, Zn Acetate) Fiber/n-Si and polyvinyl alcohol (Ni, Zn Acetate)/n-Si Schottky diodes

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