Physisorption of nucleobases on graphene: a comparative van der Waals study
Artikel i vetenskaplig tidskrift, 2012

The physisorption of the nucleobases adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U) on graphene is studied using several variants of the density functional theory (DFT): the generalized gradient approximation with the inclusion of van der Waals interaction (vdW) based on the TS approach (Tkatchenko and Scheffer 2009 Phys. Rev. Lett. 102 073005) and our simplified version of this approach (here called sTS), the van der Waals density functional vdW-DF (Dion et al 2004 Phys. Rev. Lett. 92 246401) and vdW-DF2 (Lee et al 2010 Phys. Rev. B 82 081101), and DFT-D2 (Grimme 2006 J. Comput. Chem. 27 1787) and DFT-D3 (Grimme et al 2010 J. Chem. Phys. 132 154104) methods. The binding energies of nucleobases on graphene are found to be in the following order: G > A > T > C > U within TS, sTS, vdW-DF, and DFT-D2, and in the following order: G > A > T ~ C > U within DFT-D3 and vdW-DF2. The binding separations are found to be different within different methods and in the following order: DFT-D2 < TS < DFT-D3 ~ vdW-DF2 < vdW-DF. We also comment on the efficiency of combining the DFT-D approach and vdW-DF to study systems with van der Waals interactions.

Författare

Duy Le

University of Central Florida

Abdelkader Kara

University of Central Florida

Elsebeth Schröder

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Per Hyldgaard

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Talat S. Rahman

University of Central Florida

Journal of Physics Condensed Matter

0953-8984 (ISSN)

Vol. 24 424210- 424210

Styrkeområden

Nanovetenskap och nanoteknik

Livsvetenskaper och teknik

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Annan fysik

Biofysik

Teoretisk kemi

Den kondenserade materiens fysik

Fundament

Grundläggande vetenskaper

DOI

10.1088/0953-8984/24/42/424210