Effects of Silver (Ag) Doping on Dielectric and Structural Properties of Polyethylene Glycol (PEG) Nanocomposite Thin Films
3rd INTERNATIONAL CONGRESS ON MATERIALS SCIENCE AND ENGINEERING, Milan, Italy, 15 - 17 July 2026, pp.32, (Summary Text)
- Publication Type: Conference Paper / Summary Text
- City: Milan
- Country: Italy
- Page Numbers: pp.32
- Istanbul University Affiliated: Yes
Abstract
Polyethene glycol (PEG) is a well-known biocompatible, thermoplastic, linear polymer. PEG has application potential in various areas, including drug delivery, coverage of biomedical devices, dermatological applications, and food packaging. The structure to describe the nanocomposite of PEG including Ag is represented as Ag/PEG in this presentation. The variation of Ag doping ratio among thin film samples was defined as %10, %20, 30%, and %40 in terms of thickness. Ag/PEG nanocomposite thin films were deposited by a combination of thermal and electron beam deposition systems. 35000 g/mol PEG was selected as a thin film matrix, which was deposited by thermal evaporation. Ag granules with high purity were used as doping material, which was deposited by e-beam evaporation. Thicknesses of all samples were selected as 500 nm. Presence of Ag may cause a change in dielectric properties. When dielectric results of pure PEG thin film are compared with Ag/PEG nanocomposites, it has been seen that at the low frequency side, where space charge polarisation can be observed, dielectric constants are almost the same for all samples. This can be attributed to the presence of a low amount of Ag atoms in nanocomposite thin films, which are polarised by accumulation at low frequencies. Toward higher frequencies, it has been seen that the dielectric constant differs for all samples. It can be evaluated as Ag atoms doped into the PEG thin film matrix were bonded to oligomers, which were produced as a result of the thermal evaporation process. Bonding of Ag atoms may cause restriction of segmental motion inside Ag/PEG nanocomposite thin films. Oligomers with changing sizes by the addition of Ag atoms can contribute to electric polarisation in dipolar characteristics.