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Planar Silicene: A New Silicon Allotrope Epitaxially Grown by Segregation
Author(s) -
StpniakDybala Agnieszka,
Dyniec Paweł,
Kopciuszyski Marek,
Zdyb Ryszard,
Jałochowski Mieczysław,
Krawiec Mariusz
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201906053
Subject(s) - silicene , materials science , silicon , graphene , scanning tunneling microscope , epitaxy , planar , density functional theory , substrate (aquarium) , chemical physics , condensed matter physics , ab initio , crystallography , nanotechnology , optoelectronics , computational chemistry , layer (electronics) , chemistry , computer graphics (images) , oceanography , physics , geology , computer science , organic chemistry
2D sheets of graphene‐like silicon, namely planar silicene, are synthesized. This new silicon allotrope is prepared on Au(111) thin films grown on a Si(111) substrate in the process of surface segregation. Owing to its almost perfectly flat geometry it shares the atomic structure with graphene rather than with low‐buckled silicene. Scanning tunneling microscopy measurements clearly display an atomically resolved planar silicene honeycomb lattice. Ab initio density functional theory calculations fully support the experimental findings and predict a pure sp 2 atomic configuration of Si atoms. The present work is the first experimental evidence of epitaxial planar silicene.