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Molecular Dipole-Driven Electronic Structure Modifications of DNA/RNA Nucleobases on Graphene

By Yuefeng Yin (1546672), Jiri Cervenka (1309152) and Nikhil V. Medhekar (1546669)

Abstract

The emergence of graphene in recent years provides exciting avenues for achieving fast, reliable DNA/RNA sensing and sequencing. Here we explore the possibility of enhancing electronic fingerprints of nucleobases adsorbed on graphene by tuning the surface coverage and modifying molecular dipoles using first-principles calculations. We demonstrate that intermolecular interactions have a strong influence on the adsorption geometry and the electronic structure of the nucleobases, resulting in tilted configurations and a considerable modification of their electronic fingerprints in graphene. Our analysis reveals that the molecular dipole of the nucleobase molecules plays a dominant role in the electronic structure of graphene–nucleobase systems, inducing significant changes in the work functions and energy level alignments at the interface. These results highlight tunable control of the measured molecular signals in graphene by optimizing the surface contact between nucleobases and graphene. Our findings have important implications for identification and understanding of molecular fingerprints of DNA/RNA nucleobases in graphene-based sensing and sequencing methods

Topics: Biophysics, Biochemistry, Molecular Biology, Biotechnology, Chemical Sciences not elsewhere classified, Information Systems not elsewhere classified, nucleobase molecules, graphene, adsorption geometry, energy level alignments, surface contact, work functions, DNA, tunable control, surface coverage, fingerprint, sequencing methods, first-principles calculations, Molecular Dipole-Driven Electronic Structure Modifications
Year: 2017
DOI identifier: 10.1021/acs.jpclett.7b01283.s001
OAI identifier: oai:figshare.com:article/5135581
Provided by: FigShare
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