Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103136
Title: Assessment of the irradiation exposure of pet film with swift heavy ions using the interference-free transmission UV-VIS transmission spectra
Authors: Tuleushev, A. Z.
Harrison, F. E.
Kozlovskiy, A. L.
Zdorovets, M. V.
Issue Date: 2021
Publisher: MDPI AG
Citation: Assessment of the irradiation exposure of pet film with swift heavy ions using the interference-free transmission UV-VIS transmission spectra / A. Z. Tuleushev, F. E. Harrison, A. L. Kozlovskiy, et al. — DOI 10.3390/polym13030358 // Polymers. — 2021. — Vol. 13. — Iss. 3. — P. 1-22. — 358.
Abstract: This paper presents the results of a study of polyethylene terephthalate (PET) films irradiated with Ar and Kr ions at both normal orientation and an angle of 40° to the normal. Normal irradiation was performed using Ar8+ and Kr15+ ions with an energy of 1.75 MeV/au and fluences in the range (2-500) x1010 cm-2 for Ar8+ ions and (1.6-6.5) x1010 cm-2 for Kr15+ ions. Kr ions with an energy of 1.2 MeV/au and charges of 13+, 14+, and 15+ were used for angled irradiation. For each Kr ion charge value, three fluence values were used: 5x1010, 1x1011, and 2.5x1011 cm-2. It is well known that irradiation of PET films by swift heavy ions results in a red shift of the UV-vis transmission spectra absorption edge. The experimental transmission spectra exhibit well-defined interference fringes, which obscure the underlying transmission response. Using an existing technique to obtain inter-ference-free transmission curves Tα(λ) for both pristine and irradiated PET film samples, we found that S, the total radiation-induced absorption of light by the PET film, is proportional to the loga-rithm of the fluence F. In addition to this dependence on the irradiating fluence, we also found that the charge of the irradiating ion has a significant influence on the position of the absorption edge in the UV-vis spectra. This provides experimentally independent evidence to confirm our previous results showing that ion charge has an effect on the post-irradiation state of PET films. We present a physical interpretation of the observed absorption edge red shift in irradiated PET films as being due to the growth of extended conjugated systems via the formation of intermolecular helical structures. Our investigations into the stability of irradiation-induced effects in PET films show that comparison of UV-vis transmission spectra before and after annealing can provide information about the structure of deep traps in PET. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords: EXTENDED CONJUGATED SYSTEMS
INTERFERENCE-FREE TRANSMISSION CURVES
ION IRRADIATION INDUCED LIGHT ABSORPTION
POLYETHYLENE TEREPHTHALATE
RED SHIFT
SPIRALIZATION
STRUCTURE OF DEEP TRAPS IN PET FILM
DOPPLER EFFECT
HEAVY IONS
IRRADIATION
KRYPTON
PLASTIC BOTTLES
RADIATION
RED SHIFT
INTERFERENCE FRINGE
IRRADIATION-INDUCED EFFECTS
PHYSICAL INTERPRETATION
POLYETHYLENE TEREPHTHALATES (PET)
RADIATION-INDUCED ABSORPTION
TRANSMISSION CURVE
TRANSMISSION RESPONSE
TRANSMISSION SPECTRUMS
TRANSMISSIONS
URI: http://hdl.handle.net/10995/103136
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85099878561
PURE ID: 20890396
e8639e91-c818-4444-b44a-a936f29668ab
ISSN: 20734360
DOI: 10.3390/polym13030358
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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