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Physisorption of nucleobases on graphene: Density-functional calculations
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 3Article in journal (Refereed) Published
Abstract [en]

We report the results of our first-principles investigation on the interaction of the nucleobases adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U) with graphene, carried out within the density-functional theory framework, with additional calculations utilizing Hartree-Fock plus second-order Moller-Plesset perturbation theory. The calculated binding energy of the nucleobases shows the following hierarchy: G>A approximate to T approximate to C>U, with the equilibrium configuration being rather similar for all five of them. Our results clearly demonstrate that the nucleobases exhibit significantly different interaction strengths when physisorbed on graphene. The stabilizing factor in the interaction between the base molecule and graphene sheet is dominated by the molecular polarizability that allows a weakly attractive dispersion force to be induced between them. The present study represents a significant step toward a first-principles understanding of how the base sequence of DNA can affect its interaction with carbon nanotubes, as observed experimentally.

Place, publisher, year, edition, pages
2007. Vol. 76, no 3
Keyword [en]
walled carbon nanotubes, dna, fluorescence, magnetism
URN: urn:nbn:se:kth:diva-16842DOI: 10.1103/PhysRevB.76.033401ISI: 000248500800017ScopusID: 2-s2.0-34347386469OAI: diva2:334885
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Ahuja, Rajeev
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