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Ukr. J. Phys. 2015, Vol. 59, N 10, p.1026-1036
doi:10.15407/ujpe59.10.1026    Paper

Adamiv V.T.1, Bolesta I.M.2, Burak Ya.V.1, Gamernyk R.V.2, Dutka R.M.1, Karbovnyk I.D.2, Periv M.V.2, Teslyuk I.M.1

1 Institute of Physical Optics
(23, Dragomanov Str., Lviv 79005, Ukraine)
2 Ivan Franko National University of Lviv
(50, Dragomanov Str., Lviv 79005, Ukraine)

Formation and Optical Properties of Silver Nanoparticles in Li2B4O7−Gd2O3−Ag2O Borate Glass

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: The formation of metallic (silver) nanoparticles (AgNPs) in the near-surface layer of 97.0Li2B4O7–1.0Gd2O3–2.0Ag2O (Li2B4O7:Gd,Ag)glass at the annealing in vacuum or in air has been reported. The “bottom-up”mechanism of nanoparticle formation is suggested. A conclusion is drawn that the annealing in vacuum does not necessarily require the presence of reducing ions, whereas the formation of nanoparticles at the annealing in air is impossible without reducing agents. Structural defects play a crucial role in the AgNPs nucleation process. The intense plasmon absorption bands peaked at 400.4, 564.2, and 413.7 nm are observed in the absorption spectra of glasses enriched with AgNPs. The average radius of nanoparticles is calculated from the half-width of plasmon bands and falls within the interval of 1.0–1.5 nm. The nonlinear refractive index n2 related to plasmons in AgNPs is calculated from the normalized transmission and absorption spectra, is positive, and increases approximately 2–4 times as compared to that of Li2B4O7:Gd,Ag matrix.

Key words: borate glass, metallic Ag nanoparticles, plasmon resonance, nonlinear refractive index.