Free-volume structure of glass-As2Se3/PVP nanocomposites prepared by mechanochemical milling

O. Shpotyuk (1) , A. Ingram (2) , Z. Bujňáková , P. Baláž , Y. Shpotyuk (3) , C. Boussard-Plédel (4) , B. Bureau (4)

1 Jan Dlugosz University in Czestochowa
2 Opole University of Technology
3 Ivan Franko National University of Lviv
4 ISCR - Institut des Sciences Chimiques de Rennes

Atomic-deficient void structure is studied in nanocomposites prepared by mechanochemical milling of glassy g-As2Se3 in a water solution of polyvinylpyrrolidone (PVP) employing positron annihilation lifetime spectroscopy. Formalism of Ps-to-positron trapping conversion known as x3-x2-CDA (coupling decomposition algorithm) is applied to identify free-volume defects in the pelletized g-As2Se3/PVP nanocomposite in respect to dry-milled g-As2Se3 one. Under wet-milling, the inter-nanoparticle Ps-decaying sites in preferential PVP environment replace free-volume positron traps (in dry-milled g-As2Se3) with defect-specific lifetime of 0.352 ns, corresponding to di-/tri-atomic vacancies in g-As-Se. © 2018 Author(s).

Keywords: arsenic selenide; free-volume defect; mechanical milling; nanocomposite; nanoparticle; positron annihilation

Domains: Chemical Sciences; Chemical Sciences; Material chemistry

O. Shpotyuk, A. Ingram, Z. Bujňáková, P. Baláž, Y. Shpotyuk, et al.. Free-volume structure of glass-As2Se3/PVP nanocomposites prepared by mechanochemical milling. 9th International Conference on Times of Polymers and Composites From Aerospace to Nanotechnology, Jun 2018, Ischia, Italy. pp.020150, ⟨10.1063/1.5046012⟩. ⟨hal-01874719⟩