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From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization
Author(s) -
Lewandowski Adrián L.,
Tosoni Sergio,
Gura Leonard,
Schlexer Philomena,
Marschalik Patrik,
Schneider WolfDieter,
Heyde Markus,
Pacchioni Gianfranco,
Freund HansJoachim
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201903922
Subject(s) - bilayer , amorphous solid , materials science , characterization (materials science) , scanning tunneling microscope , substrate (aquarium) , germanium , amorphous silica , crystallography , thin film , nanotechnology , atomic units , chemical physics , chemical engineering , chemistry , optoelectronics , silicon , membrane , oceanography , physics , quantum mechanics , geology , engineering , biochemistry
A new two‐dimensional (2D) germanium dioxide film has been prepared. The film consists of interconnected germania tetrahedral units forming a bilayer structure, weakly coupled to the supporting Pt(111) metal‐substrate. Density functional theory calculations predict a stable structure of 558‐membered rings for germania films, while for silica films 6‐membered rings are preferred. By varying the preparation conditions the degree of order in the germania films is tuned. Crystalline, intermediate ordered and purely amorphous film structures are resolved by analysing scanning tunnelling microscopy images.