From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-08, Vol.58 (32), p.10903-10908
Main Authors: Lewandowski, Adrián L., Tosoni, Sergio, Gura, Leonard, Schlexer, Philomena, Marschalik, Patrik, Schneider, Wolf‐Dieter, Heyde, Markus, Pacchioni, Gianfranco, Freund, Hans‐Joachim
Format: Article
Language:English
Subjects:
amorphous structures
Communication
Communications
Crystal structure
crystalline materials
Crystallinity
Density functional theory
germania
Germanium
Germanium oxides
Microscopy
scanning probe techniques
Scanning tunneling microscopy
Silica
Silicon dioxide
Substrates
thin films
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Summary: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. A 2D germanium dioxide film consisting of interconnected germania tetrahedral units forming a bilayer structure, weakly coupled to the supporting Pt(111) metal‐substrate has been prepared. 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 analyzing scanning tunneling microscopy images.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201903922