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Vibrational dynamics and surface structure of amorphous selenium
Autoři: Scopigno T. | Steurer W. | Yannopoulos S.N. | Chrissanthopoulos A. | Krisch M. | Ruocco G. | Wágner Tomáš
Rok: 2011
Druh publikace: článek v odborném periodiku
Název zdroje: Nature Communications
Název nakladatele: Nature Publishing Group
Místo vydání: London
Strana od-do: "195-1"-"195-7"
Tituly:
Jazyk Název Abstrakt Klíčová slova
cze Vibrační dynamiky a povrchová struktura amorfního selenu Tato práce se zabývá rozdíly ve vibračních dynamikách a atomovou strukturou mezi zabudovanými a povrchovými atomy amorfního selenu. vibrační dynamika;povrchová struktura;amorfní selen
eng Vibrational dynamics and surface structure of amorphous selenium In contrast to crystalline solids in which structural order governs dynamics and thermodynamics, the lack of long-range periodicity in amorphous materials is responsible for several anomalies. Although the relation between these anomalies and the 'bulk structure' is generally understood, the surface structure and the corresponding vibrational spectrum of amorphous solids is practically an unexplored theme. In this study, we resolve the differences in vibrational dynamics and atomic structure between bulk and surface (top 5 nm) atoms of amorphous selenium. We combine experimental (grazing incidence inelastic X-ray scattering) and computational (ab initio and semiempirical molecular orbital theoretical calculations) methods to scrutinize a variety of possible structural models. We find that a high concentration of particular types of 'coordination defects' in the surface layer is responsible for the observed differences. Resolving the structure of amorphous surfaces is, for example, important for understanding nanoparticles' properties where the surface-to-bulk ratio has a crucial role Vibrational dynamics;surface structure;amorphous selenium