Hg adatoms on graphene: A first-principles study
authors Fenta, AS; Amorim, CO; Goncalves, JN; Fortunato, N; Barbosa, MB; Araujo, JP; Houssa, M; Cottenier, S; Van Bael, MJ; Correia, JG; Amaral, VS; Pereira, LMC
nationality International
author keywords graphene; DFT; ab initio calculations; adatoms; binding energy; electric field gradient
abstract 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.
isbn 2515-7639
year published 2021
volume 4
issue 1
digital object identifier (doi) 10.1088/2515-7639/abc31c
web of science category 10
subject category Materials Science, Multidisciplinary
unique article identifier WOS:000626446700001