Abstract
Nanovoids in As2S3-based glasses (As2S3, (As2S3)85Ag15, and (As2S3)85(AgI)15), a polymer and a As2S3-polymer nanocomposite were studied using the positron annihilation lifetime spectroscopy (PALS) technique. After computer treatment of the PALS data recorded, it was found that only two components τ 1 (short-lived) near 0.2 ns and τ 2 (long-lived) near 0.4 ns are resolved for the As2S3-based glasses. At the same time, in the case of the polymer sample two components τ 2 near 0.3 ns and τ 3 (pick-off annihilation of ortho-positronium) near 2.8 ns were detected, while for the As2S3-polymer nanocomposite three components τ 1 near 0.2–0.3 ns, τ 2 near 0.4–0.5 ns and τ 3 near 2.4 ns were established. The volume of nanovoids in the materials studied was determined, and the fractional free volumes of the As2S3-polymer nanocomposite and the polymer matrix were compared. The results obtained are important to utilize As2S3-based glasses and polymer nanocomposites for advanced sensor applications.
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Acknowledgments
This work is partly supported by the Ministries of Education and Science of Ukraine and Bulgaria in the framework of the Bilateral Ukrainian-Bulgarian Cooperation on Science and Technology (2009–2010). One of the authors (TK) also gratefully acknowledges an International Visegrad Fund for the award of scholarship (Ref. No. 50810672) and Dr. M. Hyla and Prof. J. Filipecki for their kind assistance with the PALS set-up. K.K. and V.B. are grateful to the financial support of project BG051PO001/07/3.3-02/58/17.06.2008.
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Kavetskyy, T., Kolev, K., Boev, V., Petkov, P., Petkova, T., Stepanov, A.L. (2011). Nanovoids in Glasses and Polymers Probed by Positron Annihilation Lifetime Spectroscopy. In: Reithmaier, J., Paunovic, P., Kulisch, W., Popov, C., Petkov, P. (eds) Nanotechnological Basis for Advanced Sensors. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0903-4_11
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DOI: https://doi.org/10.1007/978-94-007-0903-4_11
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