Enhancing Optical Properties of Modified PVC and Cr 2 O 3 Nanocomposite
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00242-8
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Enhancing Optical Properties of Modified PVC and Cr2O3 Nanocomposite Rasheed N. Abed1 · Mohammed Kadhom2 · D. S. Ahmed3 · A. Hadawey4 · Emad Yousif5 Received: 1 June 2020 / Revised: 2 August 2020 / Accepted: 7 September 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract In this work, a novel grafting of chromium (III) oxide C r2O3 nanoparticles (NPs) within polyvinyl chloride (PVC) was conducted to obtain high conductivity and stability toward the light absorption for the polymer. The optical properties of pure and doped PVC thin films were investigated with different content to embed chromium (III) oxide. The measurements of spectrophotometer reflectance in the wavelengths range of 250–1300 nm and UV–Visible in the wavelengths range of 200–800 nm were reported. Adding 0.05 g of C r2O3 NPs leaded to improve all the optical properties of PVC–Cr2O3 films. The optical features calculations were determined, namely absorbance, reflectance, transmittance, extinction coefficient, refractive index, optical density, real and imaginary of dielectric constant, direct and indirect energy gaps, Urbach energy, and optical conductivity. Two Schiff bases were synthesized and used for doping, identified as a, and b. The energy gaps of modified PVC films were calculated and found to decrease from 5.5 eV of pure PVC to 2.4 and 3.2 eV for a and b samples, respectively, in the direct allowed transition. In the indirect allowed transition, lower values were obtained, where the pure PVC gab was 4.2 eV and decreased to 1.75 and 3.3 eV for a and b, respectively. The Urbach band tail was also computed for thin films and concluded in a table. For our best knowledge, doping Cr2O3 NPs in the PVC is firstly reported here, which aimed to reinforced the polymer and reduced its energy gap. The results detected that the photostability of doped PVC is better than the pure PVC. Keywords Poly (vinyl chloride) · Chromium oxide · Optical properties · Energy band gap · Urbach energy
1 Introduction The demand for polymers is increasing through the latest decades because of their remarkable properties, such as abundance in the market, easy process-ability, low cost, * Rasheed N. Abed [email protected]; [email protected] 1
Mechanical Engineering Department, Engineering College, Al-Nahrain University, Baghdad, Iraq
2
Department of Environment, College of Energy and Environmental Sciences, Alkarkh University of Science, Baghdad, Iraq
3
Department of Medical Instrumentation Engineering, Al-Mansour University College, Baghdad, Iraq
4
School of Engineering, London South Bank University, 103 Borough Road, London SE1 0AA, UK
5
Department of Chemistry, College of Science, Al-Nahrain University, Baghdad, Iraq
low weight, easy fabrication, and high-quality thin film surfaces [1]. Advancing polymers properties, particularly the semiconducting ones, by adding different mo
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