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Abstract: Polyaniline was synthesized by the chemical oxidative polymerization of aniline. Poly aniline (PANI) blended with polyvinyl alcohol (PVA) which prepared by solution cast method using N-Methyl Pyrolidone (NMP).The polyaniline powder was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In this paper we study...
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... As a result, a precise assessment of its evaluation value is required, which can be accomplished by analyzing the absorption spectra of the optical samples under consideration. The abs are used to calculate Eg by Mott and Davis formula, which is used to convert the absorption spectrum into Tauc's plot [23] Table 1 for various gamma doses. With increasing the gamma dose, it is seen that the value of Eg reduces from (3.25 to 2.7 eV)for (unirradiated to 50 kGy)it is matched with other literature [19][24]. ...
... The refractive (n) and extinction (k) coefficients are essential attributes for analyzing optoelectronic components. The following equations can be used to achieve both of them [23]. Fig.10 Outlines The dependence of the extinction coefficient on incident light wavelengths for the irradiated samples. ...
... The optical response of a material is mostly examined related to optical conductivity (ϭ), which is the electrical conductivity that comes from the movement of charge carriers caused by the incident electromagnetic waves' oscillating electric field. The following equation can be used to express the optical conductivity [23]. Fig. 13 illustrates the optical conductivity of irradiated samples concerning incident photon energy. ...
... where k = ␣ /4 is the extinction coefficient and is the incident UV-vis radiation wavelength. The extinction coefficient k describes the properties of the material with respect to light of a given wavelength and indicates the absorption changes when the electromagnetic wave propagates through a material [58]. The refractive index is calculated for all samples and presented in Fig. 11 in the visible light spectrum (400-650 nm). ...
... The following polymers derived from poly(vinyl chloride) were all prepared by the method previously described by (Ahmed, 2014) as shown intable 1. A solution of Poly(vinyl chloride) solution or modified Poly(vinyl chloride)(5 g /100 ml) in tetrahydrofuran was used to prepare (30 μm) thickness of polymer films, (measured by a micrometer type 2610 A, Germany). ...
The photo-stabilization of polymers derived from poly(vinyl chloride) (PVC) films was investigated. The PVC and modified PVC films were produced by the casting method from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl and hydroxyl indices and weight loss method with irradiation time and morphology study for all the films. The changes in viscosity average molecular weight of PVC with irradiation time were also tracked (using THF as a solvent).
Here we propose the use of the organic semiconductor polyaniline (PANI) for the preparation of spherical-shaped microparticles to serve as handles in optical tweezers (OT) experiments. The stable trapping and manipulation of PANI beads was demonstrated for the first time, using a Gaussian ($TEM_{00}$) beam optical tweezers. The trap stiffness was characterized for various different parameters such as the bead radius, the laser power and the distance between the bead and the coverslip of the sample chamber, attesting the viability of using such material for optical manipulation. Since the effective optical properties of PANI can be modulated by the synthesis process, new related applications are also proposed. The results of the present work therefore open the door for using semiconductor polymeric materials in OT applications.
In the present time, organic light-emitting diode (OLED) is a very promising participant over light-emitting diodes (LEDs), liquid crystal display (LCD), and also another solid-state lighting device due to its low cost, ease of fabrication, brightness, speed, wide viewing angle, low power consumption, and high contrast ratio. The most prominent layer of OLED is the emissive layer because the device emission color, contrast ratio, and external efficiency depend of this layer’s materials. This review ruminates on the basics of OLEDs, different light emission mechanisms, OLEDs achievements, and different types of challenges revealed in the field of OLEDs. This review’s primary intention is to broadly discuss the synthesizing methods, physicochemical properties of conducting polymer polymethyl methacrylate (PMMA), and its polymeric nanocomposite-based emissive layer materials for OLEDs application. It also discusses the most extensively used OLED fabrication techniques. PMMA-based polymeric nanocomposites revealed good transparency properties, good thermal stability, and high electrical conductivity, making suitable materials as an emissive layer for OLED applications.
Synthesis of polyvinyl alcohol (PVA)–polyethylene oxide (PEO)–copper oxide (CuO) nanocomposites and studying their structural and optical properties for humidity sensors applications were investigated. The prepared humidity sensors have lightweight, low cost, flexible and high sensitivity compare with other humidity sensors. The results showed that the nanocomposites have high absorption in UV region. The absorbance of (PVA–PEO) blend increases with increase in CuO nanoparticles concentrations which may be used for solar cell, transistors, diodes and other electronic applications. The optical constants increase while the transmittance and energy gap decrease as CuO nanoparticles concentrations increase. The results of application showed that the (PVA–PEO–CuO) nanocomposites with different copper oxide nanoparticles concentrations have high sensitivity for relative humidity which may be used as sensors for different humidity ranges.
Poly (vinyl chloride) (PVC) blended with DCM laser dye co-doped with TiO 2 nanoparticles thin films were prepared using cast method. The TiO 2 nanoparticles was synthesized using sol-gel technique. It was observed from result that the allowed direct electronic transitions energy gap was decreased from 2.08 to 1.94 eV as the temperature increasing from 25-70 • C while the allowed indirect electronic transition energy gap increasing from 1.98 to 2.09 eV as the temperature increasing with the same range. The optical properties of final samples such as absorbance, absorption coefficient, refractive index and the optical conductivity of the prepared thin films were studied under the effect of annealing temperature changes.
