DNA and DNA-based polymers are of interest in molecular electronics because of their versatile and programmable structures. However, transport measurements have produced a range of seemingly contradictory results due to differences in the measured molecules and experimental set-ups, and transporting significant current through individual DNA-based molecules remains a considerable challenge. Here, we report reproducible charge transport in guanine-quadruplex (G4) DNA molecules adsorbed on a mica substrate. Currents ranging from tens of picoamperes to more than 100 pA were measured in the G4-DNA over distances ranging from tens of nanometres to more than 100 nm. Our experimental results, combined with theoretical modelling, suggest that transport occurs via a thermally activated long-range hopping between multi-tetrad segments of DNA. These results could re-ignite interest in DNA-based wires and devices, and in the use of such systems in the development of programmable circuits.
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The authors thank E. Mastov, T. Dagan, J. Ghabboun, J. Gomez-Herrero, I. Lapides, D. Evplov, D. Park, V. Gutkin, I. Brodsky, E. Molinari, A. Garbesi, R. Rohs, D. N. Beratan, A. Nitzan and T. Milledge for technical support and discussions. Ab initio computations were performed using the Duke Shared Cluster Resource. This work was supported by the European Commission through grants ‘DNA-based nanowires’ (IST–2001-38951), ‘DNA-based nanodevices’ (FP6-029192) and FP7-ERC 226628, by the European Science Foundation COST MP0802, the Israel Science Foundation (1145/10 and 1589/14), Binational Science Foundation (BSF) grant 2006422, the Minerva Center for Bio-Hybrid complex systems, the Institute for Advanced Studies of the Hebrew University of Jerusalem, the Italian Institute of Technology project MOPROSURF, Fondazione Cassa di Risparmio di Modena, the Office of Naval Research (award no. N00014-09-1-1117) and the National Science Foundation (grant CHE-1057953). D.P. thanks the Etta and Paul Schankerman Chair of Molecular Biomedicine.
The authors declare no competing financial interests.
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Livshits, G., Stern, A., Rotem, D. et al. Long-range charge transport in single G-quadruplex DNA molecules. Nature Nanotech 9, 1040–1046 (2014). https://doi.org/10.1038/nnano.2014.246
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