Hg adatoms on graphene: A first-principles study

• Type: Article in International Scientific Journal
• Date: 2021

Authors

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

Journal

The Journal is awaiting validation by the Administrative Services.

Title: JOURNAL OF PHYSICS-MATERIALS

Vol. 4

ISSN: 2515-7639

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 6 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10