  Electrical conductivity of DNA has been a controversial topic since it was
first proposed in 1962. Disparities in the experimental results can often be
explained by differences of the ambient or experimental conditions. We report
the dielectrophoretic trapping and electrical characterization of two rod-like
DNA origami structures with different modifications. These were 12helix
bundles, with either thiol-ends or polyA single-stranded overhangs, and
30-helix bundles, with thiol-ends and either with or without a PEG-PLL coating.
The observed impedance spectra showed ohmic resistances ranging from 500
k$\Omega$ to 3.4 M$\Omega$ for the 30-helix bundle structures with a PEG-PLL
coating. DNA origami structures without the coating were always nonconductive.
Depending on the structure, destruction of the gold nanoelectrodes occurred
frequently during the trapping of DNA origami nanostructures. This indicates
high currents, resulting from the trapped conductive nanostructures.
