Assessment of the irradiation exposure of pet film with swift heavy ions using the interference-free transmission UV-VIS transmission spectra

Tuleushev A.Z. Harrison F.E. Kozlovskiy A.L. Zdorovets M.V.
1 February 2021 MDPI AG

Polymers
2021 #13 Issue 3 1 - 22 pp.

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.

Extended conjugated systems , Interference-free transmission curves , Ion irradiation induced light absorption , Polyethylene terephthalate , Red shift , Spiralization , Structure of deep traps in PET film

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Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russian Federation
Engineering Profile Laboratory, L.N. Gumilyov, Eurasian National University, Nur-Sultan, 010008, Kazakhstan
Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Department of Intelligent Information Technologies, Ural Federal University, Yekaterinburg, 620075, Russian Federation

Flerov Laboratory of Nuclear Reactions
Engineering Profile Laboratory
Laboratory of Solid State Physics
Department of Intelligent Information Technologies

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