Наукова електронна бібліотека
періодичних видань НАН України
періодичних видань НАН України
Low-temperature positron annihilation study of B⁺-ion implanted PMMA
Репозиторій DSpace/Manakin
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Low-temperature positron annihilation study of B⁺-ion implanted PMMA
Тема:
Международная научно-практическая конференция «Нанотехнологии и наноматериалы»
Інший ID:
PACS 81.05.Lg, 78.70.Bj, 61.80.Jh, 36.10.Dr
Посилання:
Low-temperature positron annihilation study of B⁺-ion implanted PMMA / T.S. Kavetskyy, V.M. Tsmots, S.Ya. Voloshanska, O. Šauša, V.I. Nuzhdin, V.F. Valeev, Y.N. Osin, and A.L. Stepanov // Физика низких температур. — 2014. — Т. 40, № 8. — С. 959-963. — Бібліогр.: 30 назв. — англ.
Підтримка:
T.S. Kavetskyy and A.L. Stepanov acknowledge the SAIA for scholarships within the National Scholarship Programme of the Slovak Republic. O. Šauša wishes to thank the Slovak Grant Agency VEGA for support by the grant No. 2/0099/10 and Agency ME SR for Structural Funds EU (Cekomat II, ITMS 2624012002102). This work was also partly supported by the SFFR of Ukraine No. F52.2/003 and the RFBR Nos. 13–02–12012, 12–02–00528 and 12–02–97029 in Russia.
Дата:
2014
Переглядів:
779
Завантажень:
649
Анотація:
Temperature dependent positron annihilation lifetime spectroscopy (PALS) measurements in the range of 50–300 K are carried out to study positronium formation in 40 keV B+-ion implanted polymethylmethacrylate (B:PMMA) with two ion doses of 3.13·10¹⁵ and 3.75·10¹⁶ ions/cm². The investigated samples show the various temperature trends of ortho-positronium (o-Ps) lifetime τ3 and intensity I3 in PMMA before and after ion implantation. Two transitions in the vicinity of ∼150 and ∼250 K, ascribed to γ and β transitions, respectively, are observed in the PMMA and B:PMMA samples in consistent with reference data for pristine sample. The obtained results are compared with room temperature PALS study of PMMA with different molecular weight (Mw) which known from literature. It is found that B⁺-ion implantation leads to decreasing Mw in PMMA at lower ion dose. At higher ion dose the local destruction of polymeric structure follows to broadening of lifetime distribution (hole size distribution).
