Invited
RECENT ACHIEVEMENTS OF POSITRON ANNIHILATION SPECTROSCOPY (PAS): APPLICATION TO POLYMERS AND SOME COMPOSITE MATERIALS

Taras Kavetskyy 1,2 Kiyoshi Iida 3 Yasuyuki Nagashima 3 Maciej Oskar Liedke 4 Naren Srinivasan 4 Andreas Wagner 4 Reinhard Krause-Rehberg 5 Ondrej Šauša 6 Andrey L. Stepanov 7,8 Louisa Meshi 9,10 Arik Kiv 9 David Fuks 9 Isaac Dahan 11
1Department of Biology and Chemistry, Drohobych Ivan Franko State Pedagogical University, Drohobych, Ukraine
2Department of Applied Physics, The John Paul II Catholic University of Lublin, Lublin, Poland
3Department of Physics, Tokyo University of Science, Tokyo, Japan
4Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
5Department of Physics, University Halle, Halle, Germany
6Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
7Kazan Physical-Technical Institute, Russian Academy of Sciences, Kazan, Russia
8Institute of Physics, Kazan Federal University, Kazan, Russia
9Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel
10Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
11., Nuclear Research Center Negev, Beer-Sheva, Israel

The report will review recent achievements in application of positron annihilation spectroscopy (PAS) using a variable-energy positron beam or slow positron beam spectroscopy (SPBS) [1-4] as a key technique that shows a completely new way to understand the radiation-induced processes and defect structure in a variety of materials important for practical use.

In this context, PAS-SPBS is demonstrated as a powerful experimental tool applied, in particular, to polymer nanocomposites with carbon nanostructures and metal nanoparticles (MNPs) (see also [5]). The results concerning 40 keV boron-ion-implanted polymethylmethacrylate (B:PMMA) and 30 keV silver-ion-implanted polymethylmethacrylate (Ag:PMMA) will be discussed. The possibilities of PAS-SPBS techniques use to clarify the mechanisms of a formation of carbon nanostructures in B:PMMA and Ag NPs in Ag:PMMA are highlighted.

Another example of PAS-SPBS application is connected with study the radiation-induced processes in U4Al7Si5 compound subjected to 30 keV Ar+ implantation. In [6] it was established that in materials, whose composition includes atoms with very different masses, under ion bombardment in certain energy intervals so called heavy clusters are formed. At this stage the formation of U clusters in mentioned compound due to a disordering of crystal structure upon Ar ion implantation could be suggested from the obtained Doppler broadening PAS-SPBS results.

[1] T. Kavetskyy et al., J. Phys. Chem. B 118, 4194 (2014).

[2] T.S. Kavetskyy et al., Low Temp. Phys. 40, 747 (2014).

[3] T.S. Kavetskyy, A.L. Stepanov, in: Radiation Effects in Materials, InTech, 2016, P. 287-308.

[4] T. Kavetskyy et al., J. Phys.: Conf. Ser. 791, 012028 (2017).

[5] G. Panzarasa et al., Nanotechnology 27, 02LT03 (2016).

[6] A. Kiv et al., Intern. J. Adv. Comp. Techn. 4, 81 (2015).









Powered by Eventact EMS