Thickness Dependent Dielectric Loss of Plasma Poly (Ethylene Oxide) Films
| Autor: | Hulusi Kemal Ulutaş |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
thin film
02 engineering and technology dielektrik özellikler 01 natural sciences ince film Condensed Matter::Materials Science 0103 physical sciences lcsh:Science lcsh:Science (General) plasma poly (ethylene oxide) Poly ethylene 010302 applied physics Physics Thickness dependent dinamik camsı geçiş sıcaklığı General Medicine dynamic glass transition temperature 021001 nanoscience & nanotechnology plazma poli (etilen oksit) dielectric properties lcsh:TA1-2040 lcsh:Q 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) Nuclear chemistry lcsh:Q1-390 |
| Zdroj: | Cumhuriyet Science Journal, Vol 39, Iss 2, Pp 366-374 (2018) |
| ISSN: | 2587-2680 |
| Popis: | Dielectric properties of plasma poly (ethylene oxide) (pPEO) thin film samples were investigated at room temperature. The thin film samples with different thicknesses were deposited by plasma assisted physical vapor deposition (PAPVD) technique at 5 W plasma discharge power. The thicknesses were 20, 100, 250, 500 nm. It was observed that dielectric constant increases with increasing thickness. The relaxation times determined by dielectric loss-frequency relation, shift toward higher frequencies with increasing thickness. In addition film thickness, heating processes were defined as another parameter. By this purpose, thin film samples were heated and cooled, respectively. It was observed that maxima and minima of dielectric loss at cooling process take place at lower frequencies in comparison with frequencies at which maxima and minima were detected at heating process. These results may show the effect of dead layer at thinner films. After heating process, it was observed from behavior of dielectric constant and dielectric loss that the crosslinking density increases by heating effect. This effect may cause additional reactions between free radicals which are production of PAPVD. Moreover, dynamic glass transition temperatures were calculated. These temperatures prove the effect of dead layer approximation. |
| Databáze: | OpenAIRE |
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