Characterization of Phonon Vibrations of Silica Bilayer Films | Zendy

Nina F. Richter | Zendy; Felix E. Feiten | Zendy; Jagriti Pal | Zendy; Agata Płucienik | Zendy; Emre Emmez | Zendy; Shamil Shaikhutdinov | Zendy; H. Kuhlenbeck | Zendy; Thomas Risse | Zendy; HansJoachim Freund | Zendy; Itziar Goikoetxea | Zendy; Radosław Włodarczyk | Zendy; Joachim Sauer | Zendy

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Characterization of Phonon Vibrations of Silica Bilayer Films

Author(s) -

Nina F. Richter,

Felix E. Feiten,

Jagriti Pal,

Agata Płucienik,

Emre Emmez,

Shamil Shaikhutdinov,

H. Kuhlenbeck,

Thomas Risse,

HansJoachim Freund,

Itziar Goikoetxea,

Radosław Włodarczyk,

Joachim Sauer

Publication year - 2019

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.8b10478

Subject(s) - bilayer , monolayer , phonon , density functional theory , annealing (glass) , chemistry , high resolution electron energy loss spectroscopy , dipole , chemical physics , oxygen , electron energy loss spectroscopy , condensed matter physics , spectroscopy , molecular vibration , materials science , molecular physics , crystallography , nanotechnology , computational chemistry , molecule , transmission electron microscopy , physics , composite material , organic chemistry , biochemistry , quantum mechanics , membrane

The vibrational properties of well-defined, two-dimensional silica films grown on Ru(0001) are characterized by high-resolution electron energy loss spectroscopy (HREELS). It is an interesting model system because it can adopt both crystalline and vitreous states. A transformation between these states induced by thermal annealing does hardly change the vibrational spectrum despite the redistribution of ring sizes. This holds good for the two intense phonon modes as well as for a variety of weaker modes observed by HREELS. The HREELS spectra allow the characterization of the structural arrangement of the oxygen atoms on the Ru(0001) surface underneath the silica bilayer. The density of oxygen at the interface can be controlled by the oxygen partial pressure during annealing, resulting in a characteristic change of the corresponding signals, which can be assigned to different oxygen structures based on density functional theory calculations. By comparison with quantum mechanical calculations and spectroscop...

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