Naslov
Ab initio and semi-empirical van der Waals study of graphene-boron nitride interaction from a molecular point of view

Autori
Caciuc, Vasile ; Atodiresei, Nicolae ; Lazić, Predrag ; Bluegel, Stefan

Izvornik
Journal of physics. Condensed matter (0953-8984) 24 (2012), 42; 424214-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Density functional theory; van der Waals interaction; molecule–surface interaction; graphene; boron nitride

Sažetak
We have performed a systematic semi-empirical and ab initio van der Waals study to investigate the bonding mechanism of benzene (C6H6), triazine (C3N3H3) and borazine (B3N3H6) adsorbed on graphene and a single boron nitride (BN) sheet. The two semi-empirical approaches used to include the van der Waals (vdW) interactions in our density functional theory (DFT) calculations suggest that the strength of the molecule-surface interaction corresponds to a strong physisorption with no net charge transfer between the molecules and the corresponding substrates. This observation is strengthened by the use of first-principles non-local correlation vdW-DF functionals which provide a sound physical basis to include vdW interactions in DFT calculations. In particular we have employed two flavors of vdW-DF functionals which enabled us to determine the role of the non-local correlation effects in the molecule-surface bonding mechanism which cannot be assessed by using only semi-empirical vdW methods. Our study also reveals that the strength of the molecule-surface interaction can be influenced by the electronegativity of the B, C and N atoms.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
S.I. on van der Waals interactions in advanced materials.

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