Article (Scientific journals)
The physics of single-side fluorination of graphene: DFT and DFT + U studies
Marsusi, F.; Drummond, N. D.; Verstraete, Matthieu
2019In Carbon, 144, p. 615-627
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Keywords :
Adatoms; Binding energy; Density functional theory; Electronic structure; Fluorination; Fluorine; Halogenation; Magnetic properties; Magnetization; Dilute limit; Electronic and magnetic properties; Finite size; Half-metallic; Re-hybridization; Sub-lattices; Time-scales; Total magnetization; Graphene
Abstract :
[en] We present density functional theory (DFT) calculations of the electronic and magnetic properties of fluorine adatoms on a single side of a graphene monolayer. By extrapolating the results, the binding energy of a single fluorine adatom on graphene in the dilute limit is calculated. Our results confirm that the finite-size error in the binding energy scales inversely with the cube of the linear size of the simulation cell. We establish relationships between stability and C–F bond nature, diffusion of fluorine adatoms and total magnetization in different configurations of adatoms. For single-side fluorination, sp2.33 is the maximum p-content re-hybridization found in the C–F bond. We show that semilocal DFT cannot predict correctly the magnetic properties of fluorinated graphene and a higher level theory, such as DFT + U is needed. The results indicate a tendency of graphene to reduce the imbalance between adsorption on the two sublattices, and therefore total magnetization, through low-energy-barrier pathways on a time scale of ∼10 ps at room temperature. The thermodynamically favored arrangements are those with the smallest total magnetization. Indeed, the electronic structure is intimately related to the magnetic properties and changes from semi-metallic to p-type half-metallic or semiconducting features, depending on the adatoms arrangement. © 2018 Elsevier Ltd
Research Center/Unit :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Marsusi, F.;  Department of Energy Engineering and Physics, Amirkabir University of Technology, PO Box 15875-4413Tehran, Iran
Drummond, N. D.;  Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom
Verstraete, Matthieu  ;  Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
Language :
English
Title :
The physics of single-side fluorination of graphene: DFT and DFT + U studies
Publication date :
2019
Journal title :
Carbon
ISSN :
0008-6223
eISSN :
1873-3891
Publisher :
Elsevier Ltd
Volume :
144
Pages :
615-627
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
ARC AIMED; PDR van der waals heterostructures
Funders :
FWB - Fédération Wallonie-Bruxelles [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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since 21 July 2019

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