  In this study, we examine the mechanism of nanopore-based DNA sequencing
using a voltage bias across a graphene nanoribbon. Using density functional
theory and a non-equilibrium Green's function approach, we determine the
transmission spectra and current profile for adenine, guanine, cytosine,
thymine, and uracil as a function of bias voltage in an energy minimized
configuration. Utilizing the transmission current, we provide a general
methodology for the development of a three nanopore graphene-based device that
can be used to distinguish between the various nucleobases for DNA/RNA
sequencing. From our analysis, we deduce that it is possible to use different
transverse currents across a multi-nanopore device to differentiate between
nucleobases using various voltages of 0.5, 1.3, and 1.6 V. Overall, our goal is
to improve nanopore design to further DNA/RNA nucleobase sequencing and
biomolecule identification techniques.
