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First-principles study of physisorption of nucleic acid bases on small-diameter carbon nanotubes
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2008 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 19, no 12Article in journal (Refereed) Published
Abstract [en]

We report the results of our first-principles study based on density functional theory on the interaction of the nucleic acid base molecules adenine ( A), cytosine ( C), guanine ( G), thymine ( T), and uracil ( U), with a single-walled carbon nanotube (CNT). Specifically, the focus is on the physisorption of base molecules on the outer wall of a ( 5, 0) metallic CNT possessing one of the smallest diameters possible. Compared to the case for CNTs with large diameters, the physisorption energy is found to be reduced in the high-curvature case. The base molecules exhibit significantly different interaction strengths and the calculated binding energies follow the hierarchy G > A > T > C > U, which appears to be independent of the tube curvature. The stabilizing factor in the interaction between the base molecule and CNT is dominated by the molecular polarizability that allows a weakly attractive dispersion force to be induced between them. The present study provides an improved understanding of the role of the base sequence in deoxyribonucleic acid ( DNA) or ribonucleic acid ( RNA) in their interactions with carbon nanotubes of varying diameters.

Place, publisher, year, edition, pages
2008. Vol. 19, no 12
Keyword [en]
dna, fluorescence, molecules, force
URN: urn:nbn:se:kth:diva-17390DOI: 10.1088/0957-4484/19/12/125701ISI: 000254174200023ScopusID: 2-s2.0-42549089260OAI: diva2:335434
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Ahuja, Rajeev
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Materials Science and Engineering
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