INVESTIGATION OF DIELECTRIC PROPERTIES OF POLYETHYLENE OXIDE THIN FILMS


Thesis Type: Postgraduate

Institution Of The Thesis: Istanbul University, Faculty Of Science, Department Of Physics, Turkey

Approval Date: 2019

Thesis Language: Turkish

Student: Onur Potok

Supervisor: Hulusi Kemal Ulutaş

Abstract:

In this study, polyethylene oxide (PEO) thin films having three different molecular weights were obtained by thermal evaporation method. Sample thicknesses were determined as 20, 100, 250 and 500 nm for each molecular weight. Capacity (C) and loss factor (tanδ) measurements of the samples were carried out by dielectric spectroscopy at room temperature and frequency range of 1 Hz - 20 MHz. Dielectric constant, dielectric loss and alternative conductivity values were calculated by using the obtained results. Thickness, frequency and molecular weight behavior of dielectric properties of these samples were investigated and possible polarization mechanisms in the structure were determined