Hg adatoms on graphene: A first-principles study

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Fenta, AS (Autor) Outra; Amorim, CO (Autor) Outra; Goncalves, JN (Autor) Outra; Fortunato, N (Autor) Outra; Barbosa, MB (Autor) Outra; araujo, j. p. (Autor) FCUP; Houssa, M (Autor) Outra; Cottenier, S (Autor) Outra; Van Bael, MJ (Autor) Outra; Correia, JG (Autor) Outra; Amaral, VS (Autor) Outra; Pereira, LMC (Autor) Outra

Revista

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Título: JOURNAL OF PHYSICS-MATERIALS

Vol. 4

ISSN: 2515-7639

Indexação

ISI Web of Knowledge - 5 Citações

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-00T-Q56

DOI: 10.1088/2515-7639/abc31c

Abstract (EN): The interest in understanding the interaction between graphene and atoms that are adsorbed on its surface (adatoms) spans a wide range of research fields and applications, for example, to controllably change the properties of graphene in electronic devices or to detect those changes in graphene-based sensors. We present a density functional theory study of the interaction between graphene and Hg adatoms. Binding energy, electronic structure and electric field gradient (EFG) were calculated for various high-symmetry atomic configurations, from isolated adatoms to a continuous Hg monolayer. Hg as isolated adatom was found to be the most stable configuration, with a binding energy of 188 meV. Whereas isolated adatoms have a minor effect on the electronic structure of graphene (small acceptor effect), Hg monolayer configurations induce a metallic state, with the Fermi level moving well above the Dirac point (donor behavior). Based on the EFG calculated for the various configurations, we discuss how hyperfine techniques (perturbed angular correlation spectroscopy, in particular) can be used to experimentally study Hg adsorption on graphene.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10