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Enabling measurements of low-conductance single molecules using gold nanoelectrodes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Division for Electron Microscopy and Nanoengineering)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Division for Electron Microscopy and Nanoengineering)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)ORCID iD: 0000-0002-5496-9664
2011 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 22, no 12, 125707- p.Article in journal (Refereed) Published
Abstract [en]

A high resistance nanogap platform was used to trap and electrically characterize 30 nm thiolated double-stranded DNA molecules. High resolution scanning electron microscopy was also used to image the trapped DNA strands. It was found that the surface state of the electrodes and underlying substrate could influence the measurements of trapped molecules when the measured resistances were on the order of TΩ or greater. Hydrophilic surfaces gave rise to larger leakage currents that could potentially mask the underlying signals from molecules positioned in the nanogap. Finally, the careful handling of the samples and control of the environment is essential to avoid surface charging of the oxide substrate layer as these parasitic charges affect electrical measurements of the nanogap. The presented results thus outline some important considerations when making low-conductance measurements on molecules and should prove useful for the characterization of molecules in molecular electronics or sensors employing nanogap platforms.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2011. Vol. 22, no 12, 125707- p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials; Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-146061DOI: 10.1088/0957-4484/22/12/125707ISI: 000287448200020OAI: oai:DiVA.org:uu-146061DiVA: diva2:397489
Available from: 2011-02-15 Created: 2011-02-15 Last updated: 2017-12-11Bibliographically approved

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Welch, KenBlom, TobiasLeifer, KlausStrömme, Maria

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