Electrical, optical and dielectric properties of polyvinylpyrrolidone/graphene nanoplatelet nanocomposites

• Published in: Optical materials Vol. 139; p. 113823
• Main Authors: Mergen, Ömer Bahadır, Arda, Ertan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2023
• Subjects: ASF method; Derivative method; Dielectric constant; Kubelka-Munk method; PVP/GnP nanocomposites; Tauc method; Tauc method; ASF method; Dielectric constant; PVP/GnP nanocomposites; Derivative method; Kubelka-Munk method
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2023.113823

In this study, polyvinylpyrrolidone (PVP) nanocomposite films containing GnP in four different volume fractions (φ = 0.00, 2.00, 4.08, and 5.91) were prepared by the solution casting method. UV–Vis absorbance spectroscopy, reflectance spectroscopy, and two-point probe resistivity measurement techniques were used to examine the optical, electrical, and dielectric properties of these films. Optical band gap energies of the PVP/GnP nanocomposites were obtained using the most commonly used Tauc, Kubelka-Munk (K-M), Absorbance Spectrum Fitting (ASF), and Derivative (DM) methods. The results obtained by Tauc, K-M, and ASF methods were found to be consistent with each other. In addition, basic optical parameters such as Urbach energy (Eu), refractive index (n), optical conductivity (σopt) and dielectric constant (ε) of the PVP/GnP nanocomposites were investigated. As the GnP volume fraction increased in the nanocomposites, the electrical conductivity, Eu, n, σopt and ε increased whereas Eg decreased. These nanocomposites produced by varying the GnP volume fraction are promising for using optics, electricity, optoelectronics, and many other industrial applications. [Display omitted] •PVP/GnP nanocomposites were prepared by solution mixing and ultrasonic method.•Tauc, K-M, ASF, and DM methods were used to obtain Eg of the PVP/GnP nanocomposites.•The electrical conductivity was improved of the PVP/GnP with the addition of GnP.•Urbach energies of the PVP/GnP nanocomposites increased from 0.13 to 11.48 eV.