Title

Physisorption of nucleobases on graphene: a comparative van der Waals study

Authors

Authors

D. Le; A. Kara; E. Schroder; P. Hyldgaard;T. S. Rahman

Comments

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Abbreviated Journal Title

J. Phys.-Condes. Matter

Keywords

GENERALIZED GRADIENT APPROXIMATION; WALLED CARBON NANOTUBES; DENSITY-FUNCTIONAL THEORY; AUGMENTED-WAVE METHOD; INTERACTION ENERGIES; BASIS-SET; DNA; DISPERSION; COMPLEXES; ACCURATE; Physics, Condensed Matter

Abstract

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 similar to 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 similar to 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.

Journal Title

Journal of Physics-Condensed Matter

Volume

24

Issue/Number

42

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000309956300011

ISSN

0953-8984

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