A study on optical absorption and constants of doped poly(ethylene oxide)

Al-Faleh, R. S.; Zihlif, A. M.

doi:10.1016/j.physb.2011.01.076

Cited by 26 publications

(12 citation statements)

References 17 publications

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“…The relationship between the electrical and optical quantities of a dielectric material can be used to calculate the refractive index of the doped films at different frequencies and temperatures using Maxwell’s equations 19,20 :…”

Section: Resultsmentioning

confidence: 99%

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Al-Ahmad

Zihlif

2011

Journal of Thermoplastic Composite Materials

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This work is based on studying the alternating current (AC) electrical properties of poly (ethylene oxide) (PEO) films doped with ultrafine calcium carbonate (CaCO3). The composite films with 80 μm thickness were prepared by casting method using the solution containing PEO resin, CaCO3, and water, forming a polymeric fluid system. The impedance was measured in the frequency range from 1 to 50 kHz at different temperatures. The concentrations of CaCO3 are 0, 1, 4, 6, and 10% by weight. From impedance results, it was found that the AC conductivity decreases with increasing dopant concentration and increases with increasing temperature. The values of the dielectric constant and the dielectric loss decrease with increasing frequency. The calculated activation energy and the relaxation time showed dependence on frequency and temperature. The determined values of the refractive index decrease with increasing frequency and CaCO3 concentration and increase with increasing temperature. The observed decreases in the AC-electrical quantities of the prepared thin films (fluid system) are attributed to the presence of water traces that enhance the polarization effects. The decreases in values of dielectric constants and conductivity indicate that the doped PEO system does not behave as a solid polymer electrolyte with enhanced ionic conduction.

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Section: Resultsmentioning

confidence: 99%

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Al-Ahmad

Zihlif

2011

Journal of Thermoplastic Composite Materials

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“…The total absorption coefficient α can be calculated from the transmittance data using Lambert formulas [11]:…”

Section: Transmittance T and Reflectance R Measurementsmentioning

confidence: 99%

Study on some linear and nonlinear optical parameters of glycine hydrofluoride single crystals

El‐Fadl

Abdelsalam

Nashaat

2018

Materials Science-Poland

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Single crystal of glycine hydroflruoride (GHF) was grown from aqueous solution by slow evaporation technique. The structure of the grown crystal was tested and analyzed through X-ray powder diffraction. The functional groups have been identified from the FT-IR spectra. Slabs cut normal to the b-axis from the grown crystal were subjected to incident radiation with a wavelength range of 200 nm to 800 nm to investigate the transmittance and reflectance spectra. Linear optical parameters such as extinction coefficient k, refractive index n and both the real and imaginary parts: real and im of the dielectric permittivity were calculated as functions of the incident photon energy. The dispersion of the refractive index was fitted in terms of Cauchy formula and Wemple-DiDomenico single oscillator model. GHF crystals exhibited indirect optical interband transition and the optical energy gap E g was determined by using Tauc plot. The indirect band gaps at elevated temperatures were determined and their temperature dependence was estimated. Optical band gap E g values were found to decrease with an increase in crystal temperature; however, the band tail width exhibited opposite behavior. The nonlinear optical potential was examined by the second harmonic generation (SHG) test.

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“…In the absorption process, a photon of known energy excites an electron from a lower energy state to a higher one. The optical relative parameters such as absorption edge, optical band gaps, activation energy and other parameters were estimated using this data [25]. The spectra of PEO and doped PEO with different cobalt chloride salt concentrations are shown in Figure 3.…”

Section: Uv-visible Absorption Studymentioning

confidence: 99%

Influence of Cobalt (II) Chloride Catalysed on the Thermal and Optical Characterization of PEO Based Solid Polymer Electrolytes

Chapi

Devendrappa

2015

J. Res. Updates Polym. Sci.

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Solution-casting technique was employed for the preparation of solid polymer electrolyte based polyethylene oxide (PEO) with 0, 1, 3 and 5 weight percentage cobalt chloride (CoCl2) films were characterized by X-ray Diffractometry (XRD), Differrential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM) and Ultra Violet-Visible (UV-Vis.) Spectroscopy methods. The optical band gaps, absorption band edges and Urbach energy shows decrease with increasing of Co +2 ion concentration in the polymer matrix because of the formation of free radicals or cluster. The Thermogravimetry (TG) and Derivative Thermogravimetry (DTG) were used to examine the thermal stability of the film and it was found that the stability of the complexes is higher than that of the pure PEO due to the addition of CoCl2. The wavelength position of a fluorescence emission band varied by increasing of a dopant wt % of salt.

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A study on optical absorption and constants of doped poly(ethylene oxide)

Cited by 26 publications

References 17 publications

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Study on the electrical conduction in poly (ethylene oxide) doped with calcium carbonate

Study on some linear and nonlinear optical parameters of glycine hydrofluoride single crystals

Influence of Cobalt (II) Chloride Catalysed on the Thermal and Optical Characterization of PEO Based Solid Polymer Electrolytes

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