Electrical and optical properties of pure and silver nitrate-doped polyvinyl alcohol films

Devi, CS; Sharma, A. K.; Rao, Vijayalakshmi

doi:10.1016/s0167-577x(02)00434-2

Cited by 208 publications

(65 citation statements)

References 16 publications

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“…The larger absorption peak appeared in UV range is due to the energy gap of the PVA polymer which decreases owing to increasing the concentration of Ag nanoparticles in the structure of the films. The position of the absorption edge was determined by extrapolating the linear part of (α) versus (hυ) curves to zero absorption value [23].The band edge showed a decrease with increasing concentration of Ag nanoparticles in PVA matrix. The absorption edge shifts towards higher wavelength, indicating the decrease in the optical band gap for the doped films.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

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Jasim

Hamad

2017

JNUS

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Silver-Poly vinyl alcohol Ag/ PVA nanocomposite films were prepared by casting method at room temperature with different amount of AgNO 3 solution (0.001, 0.0015, and 0.002ml). The prepared nanocomposites were characterized using UV-VIS spectrophotometer and the optical properties were investigated in the wavelength range 300-800 nm. The absorption peaks showed a shift towards higher wavelength with increasing AgNO 3 concentration while the energy band gap and absorption edges shifted towards lower energies with the increase of AgNO 3 concentration.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

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Jasim

Hamad

2017

JNUS

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“…Since the extent of complexes' formation increases with doping element concentration, both the charge carrier density and the Ag/PVA composite conductivity increase. Remarkably, the authors noted that the increased charge carriers hopping probability across the barrier and insulator chains, determined by the CTC formation, can also be explained in the framework of the percolation theory (the favored point of view discussed in the previous section): from such a point of view, the Ag NPs act as conductive fillers in the polymer matrix providing the continuous conductive pathways for the transfer of charge from one CTC to another [89,100]. Figure 25a,b report, for the Ag/PVA composite at various Ag concentrations, the frequency-dependent dielectric constant ε′ and dielectric loss ε″, with the measurements performed at the temperature of 307 K.…”

Section: Metal Nanoparticles Embedded In Polymer Filmmentioning

confidence: 99%

Metal-Polymer Nanocomposites: (Co-)Evaporation/(Co)Sputtering Approaches and Electrical Properties

Torrisi

Ruffino

2015

Coatings

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Abstract:In this review, we discuss the basic concepts related to (co-)evaporation and (co)sputtering based fabrication methods and the electrical properties of polymer-metal nanocomposite films. Within the organic-inorganic hybrid nanocomposites research framework, the field related to metal-polymer nanocomposites is attracting much interest. In fact, it is opening pathways for engineering flexible composites that exhibit advantageous electrical, optical, or mechanical properties. The metal-polymer nanocomposites research field is, now, a wide, complex, and important part of the nanotechnology revolution. So, with this review we aim, starting from the discussion of specific cases, to focus our attention on the basic microscopic mechanisms and processes and the general concepts suitable for the interpretation of material properties and structure-property correlations. The review aims, in addition, to provide a comprehensive schematization of the main technological applications currently in development worldwide.

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“…It is clear from Table 2 that these values started to decrease on doping up to a dopant concentration of 10 wt%, then showed an increase corresponding increases in dopant concentration, probably due to segregation effects. 35 Figure 7 shows representative plots between ln(a) and hu for pure PVP, PVP-5 wt% GdCl 3 and PVP-5 wt% HoCl 3 films. The straight lines obtained confirm the dependence of the absorption coefficient on the photon energy in accordance with the empirical Urbach formula 34 :…”

Section: Ir Spectramentioning

confidence: 99%

“…Thus, a model based on the electronic transition between localized states suggests that some tail states are generated in the systems under investigation 33 in which the dopant concentration has an important role in morphological and microstructural changes occurring in the polymer matrix. [33][34][35] Figure 6 Representative plots of (a) (ahu) 2 vs hu for pure PVP, PVP+10 wt% GdCl 3 and PVP+10 wt% HoCl 3 films, and (b) (ahu) 1/2 vs hu for pure PVP, PVP+10 wt% GdCl 3 and PVP+10 wt% HoCl 3 films. …”

Section: Ir Spectramentioning

confidence: 99%

Magnetic and optical studies on polyvinylpyrrolidone thin films doped with rare earth metal salts

Basha

2010

Polym J

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A casting technique was used to prepare new nanocomposite thin films of pure and GdCl 3 -or HoCl 3 -doped polyvinylpyrrolidone (PVP). Transmission electron microscopy (TEM) was used to study the particle size and dispersibility in the investigated nanocomposites. Magnetic measurements, using a vibrating sample magnetometer (VSM), were carried out at room temperature and applied magnetic fields up to 10 kO e . The appearance of hysteresis loops with small values of saturation flux density (B s ), remanent flux density (B r ), squareness ratio (SQR) and coercive field (H c ), along with permeability (l) values relatively higher than 1, may be taken, as a matter of experimentation, to consider the investigated composites as soft magnet materials. In this study, PVP-HoCl 3 films showed slightly better magnetic properties compared with PVP-GdCl 3 films. A comparative analysis of infrared (IR) and ultraviolet-visible spectra of the parent components and their composites indicated the effective role of dopant nature and concentration in morphological and microstructural changes occurring in the PVP matrix. Optical constants, such as the energy gap (E g ) and the Urbach tail (E e ), were determined and discussed in terms of a model based on the electronic transition between localized states in the band structure.

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Electrical and optical properties of pure and silver nitrate-doped polyvinyl alcohol films

Cited by 208 publications

References 16 publications

Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

Metal-Polymer Nanocomposites: (Co-)Evaporation/(Co)Sputtering Approaches and Electrical Properties

Magnetic and optical studies on polyvinylpyrrolidone thin films doped with rare earth metal salts

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