IOSR-JAP   Volume-14 ~ Issue-1 ~ Jan. – Feb. 2022

ABSTRACT: The effect of dye extract on the Transmittance and Absorbance behavior of dye sensitized ZnSe thin film was investigated. The films were deposited using chemical bath technique by an aqueous mixture appropriate precursor to provide the needed Information Zinc ion and selenide ion. The dye extracted from the leaf of Chromolaena Odorata (Siam Weed) plant was used to sensitize the film. Uv spectrophotometer was used in the optical analysis. The results obtained indicate that the transmittance values for the ZnSe and dye sensitized ZnSe thin films showed a high value (20%-90%) in the spectral region as wavelength increases corresponding to maximum sensitivity for photonic vision.......

Keywords: Transmittance, Absorbance, Band gap, chemical bath, dye, UV– Spectrophotometer, Temperature and annealing.

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ABSTRACT: In this research, a poly-aniline polymer (PANI) was prepared using chemical oxidation polymerization method, and then it was doped with nano-graphene (GR) and poly (vinyl alcohol) (PVA), each separately with different weight ratios. The optical properties were studied through UV-vis (1800) Spectrophotometer within the range (300-900 nm) to measure the absorption, transmittance, reflection, refractive index, extinction coefficient, partial dielectric constant (real and imaginary), indirect energy gap, is estimated to be (3.02-3.60) ev. Used to determine X-ray diffraction the grain size and Interfacial distances of pure poly-aniline (PANI) samples, doped graphene (PANI / GR) and poly (vinyl alcohol) (PANI/PVA).

Keywords: Poly -aniline, graphene, poly (vinyl alcohol) optical properties, dielectric parameters

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ABSTRACT: The fine-structure constant denoted by α is a dimensionless number and very nearly equal to 1 / (137.036). For reasons of convenience, the reciprocal value of the fine-structure constant......

Keywords: Fine-Structure Constant α, Golden Ratio (Φ = 1.618034), Euler's number (e = 2.718282), and π = 3.1416.

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ABSTRACT: The Ac conductivity of the system Te80S20-xAsx was very small under the effect of each of frequency and temperature. The exponent factor decrease with temperature and reach zero at high temperature. The zero value of the exponent factor keep the electric conduction at minimum constant value. The dielectric constant and dielectric losses very high at low frequency and their values depends the medium temperature. At high frequency, the dielectric constant and dielectric losses become temperature independent. The addition of As on expense of S decrease the Ac conductivity and increase dielectric properties. The low Ac conductivity and high dielectric properties confirm the use of these material as optic fiber cables.

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[5]. Chandel N, Imran MM, Mehta N. Comprehensive studies of temperature and frequency dependent dielectric and ac conducting parameters in third generation multi-component glasses. RSC advances. 2018;8(45):25468-79.