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Conductive nanoscopic ion-tracks in diamond-like-carbon

: Zollondz, J.-H.; Schwen, D.; Nix, A.-K.; Trautmann, C.; Berthold, J.; Krauser, J.; Hofsäss, H.


Marletta, G. ; European Materials Research Society -EMRS-:
European Materials Research Society 2005. Symposium A: Current Trends in Nanoscience - from Materials to Applications. Proceedings : Strasbourg, France, 31 May - 3 June 2005
Amsterdam: Elsevier, 2006 (Materials science & engineering. C, Biomimetic and supramolecular systems 26.2006, Nr.5/7)
Symposium A: Current Trends in Nanoscience - from Materials to Applications <2005, Strasbourg>
Conference Paper, Journal Article
Fraunhofer IWS ()

Highly energetic heavy ions with energies of 1 MeV/nucleon or more (e.g. 350 MeV Au ions) result in material modification in matter. The extremely high local energy deposition along the path leads to a material change within a nanoscopic cylinder of about 10 nm throughout the film thickness (up to 30 µm). In diamond-like carbon the material change results in conducting tracks embedded in the insulating material. This is due to a change in the bond structure to a higher sp2 bonding content in the tracks and results in a conductivity change of up to four orders of magnitude. This paper discusses the conductivity mechanism in the 10 nm thick wires and presents a study of the conductivity dependence on the sp3-content in the diamond-like carbon and the used ion species. The conductive tracks are the basis of nanoscopic electronic devices made by irradiation of layered structures.