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Four-Point Probe Electrical Measurements on Templated Gold Nanowires Formed on Single DNA Origami Tiles
journal contribution
posted on 2018-09-03, 00:00 authored by Basu R. Aryal, Tyler R. Westover, Dulashani R. Ranasinghe, Diana G. Calvopiña, Bibek Uprety, John N. Harb, Robert C. Davis, Adam T. WoolleyBottom-up
nanofabrication is increasingly making use of self-assembled
DNA to fabricate nanowires and potential integrated circuits, although
yields of such electronic nanostructures are inadequate, as is the
ability to reliably make electrical measurements on them. In this
paper, we report improved yields and unprecedented conductivity measurements
for Au nanowires created on DNA origami tile substrates. We created
several different self-assembled Au nanowire arrangements on DNA origami
tiles that are approximately 70 nm × 90 nm, through anisotropic
growth of Au nanorods attached to specific sites. Modifications to
the tile design increased yields of the final desired nanostructures
as much as 6-fold. In addition, we measured the conductivity of Au
nanowires created on these DNA tiles (∼130 nm long, 10 nm diameter,
and 40 nm spacing between measurement points) with a four-point measurement
technique that utilized electron beam induced metal deposition to
form probe electrodes. These nanowires formed on single DNA origami
tiles were electrically conductive, having resistivities as low as
4.24 × 10–5 Ω m. This work demonstrates
the creation and measurement of inorganic nanowires on single DNA
origami tiles as a promising path toward future bottom-up fabrication
of nanoelectronics.
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future bottom-up fabricationmeasurement pointsnanowire arrangementsconductivity measurementsyield40 nm spacingelectron beammetal depositiontile designDNA origami tile substratesform probe electrodesTemplated Gold Nanowires10 nm diametermeasurement techniqueself-assembled DNADNA origami tilesanisotropic growthFour-Point Probe Electrical MeasurementsSingle DNA Origami Tiles Bottom-up nanofabrication
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