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Fabrication of carbon nanotube nanogap electrodes by helium ion sputtering for molecular contacts

Thiele, Cornelius and Vieker, Henning and Beyer, André and Flavel, Benjamin S. and Hennrich, Frank and Muñoz Torres, David and Eaton, Thomas R. and Mayor, Marcel and Kappes, Manfred M. and Gölzhäuser, Armin and Löhneysen, Hilbert v. and Krupke, Ralph (2014):
Fabrication of carbon nanotube nanogap electrodes by helium ion sputtering for molecular contacts.
In: Applied Physics Letters, AIP Publishing LLC, p. 103102, 104, (10), ISSN 0003-6951,
[Online-Edition: http://dx.doi.org/10.1063/1.4868097],
[Article]

Abstract

Carbon nanotube nanogaps have been used to contact individual organic molecules. However, the reliable fabrication of a truly nanometer-sized gap remains a challenge. We use helium ion beam lithography to sputter nanogaps of only (2.8 ± 0.6) nm size into single metallic carbon nanotubes embedded in a device geometry. The high reproducibility of the gap size formation provides a reliable nanogap electrode testbed for contacting small organic molecules. To demonstrate the functionality of these nanogap electrodes, we integrate oligo(phenylene ethynylene) molecular rods, and measure resistance before and after gap formation and with and without contacted molecules.

Item Type: Article
Erschienen: 2014
Creators: Thiele, Cornelius and Vieker, Henning and Beyer, André and Flavel, Benjamin S. and Hennrich, Frank and Muñoz Torres, David and Eaton, Thomas R. and Mayor, Marcel and Kappes, Manfred M. and Gölzhäuser, Armin and Löhneysen, Hilbert v. and Krupke, Ralph
Title: Fabrication of carbon nanotube nanogap electrodes by helium ion sputtering for molecular contacts
Language: English
Abstract:

Carbon nanotube nanogaps have been used to contact individual organic molecules. However, the reliable fabrication of a truly nanometer-sized gap remains a challenge. We use helium ion beam lithography to sputter nanogaps of only (2.8 ± 0.6) nm size into single metallic carbon nanotubes embedded in a device geometry. The high reproducibility of the gap size formation provides a reliable nanogap electrode testbed for contacting small organic molecules. To demonstrate the functionality of these nanogap electrodes, we integrate oligo(phenylene ethynylene) molecular rods, and measure resistance before and after gap formation and with and without contacted molecules.

Journal or Publication Title: Applied Physics Letters
Volume: 104
Number: 10
Publisher: AIP Publishing LLC
Uncontrolled Keywords: Carbon nanotubes, Electrodes, Nanofabrication, Nanotube devices, Gels
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2015 12:28
Official URL: http://dx.doi.org/10.1063/1.4868097
Identification Number: doi:10.1063/1.4868097
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