skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
 [1] ;  [2] ; ; ;  [3] ; ;  [1] ; ;  [4] ;  [1] ;  [2] ;  [5] ;  [1] ;  [2] ;  [6] ;  [1] ;  [2] ;  [6] ;  [6] ;
  1. Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe (Germany)
  2. (CFN), 76028 Karlsruhe (Germany)
  3. Faculty of Physics, Bielefeld University, 33615 Bielefeld (Germany)
  4. Department of Chemistry, University of Basel, 4056 Basel (Switzerland)
  5. (Switzerland)
  6. (Germany)
Publication Date:
OSTI Identifier:
22257071
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON NANOTUBES; ELECTRODES; HELIUM IONS; SPUTTERING