Effects of charging and electric field on graphene functionalized with titanium
Author
Gürel, H. H.
Çıracı, Salim
Date
2013Source Title
Journal of Physics Condensed Matter
Print ISSN
1361-648X
Publisher
Institute of Physics Publishing
Volume
25
Issue
27
Pages
275302-1 - 275302-8
Language
English
Type
ArticleItem Usage Stats
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Abstract
Titanium atoms are adsorbed to graphene with a significant binding energy and render diverse functionalities to it. Carrying out first-principles calculations, we investigated the effects of charging and static electric field on the physical and chemical properties of graphene covered by Ti adatoms. When uniformly Ti covered graphene is charged positively, its antiferromagnetic ground state changes to ferromagnetic metal and attains a permanent magnetic moment. Static electric field applied perpendicularly causes charge transfer between Ti and graphene, and can induce metal-insulator transition. While each Ti adatom adsorbed to graphene atom can hold four hydrogen molecules with a weak binding, these molecules can be released by charging or applying electric field perpendicularly. Hence, it is demonstrated that charging and applied static electric field induce quasi-continuous and side specific modifications in the charge distribution and potential energy of adatoms absorbed to single-layer nanostructures, resulting in fundamentally crucial effects on their physical and chemical properties. © 2013 IOP Publishing Ltd.