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Conductivity of ion tracks in diamond-like carbon films

: Zollondz, J.-H.; Krauser, J.; Weidinger, A.; Trautmann, C.; Schwen, D.; Ronning, C.; Hofsaess, H.; Schultrich, B.


Diamond and Related Materials 12 (2003), Nr.3-7, S.938-941
ISSN: 0925-9635
Fraunhofer IWS ()
diamond-like carbon; ion track; field emission; nanostructure

High-energy heavy ions (e.g. 1 GeV uranium ions) passing through a diamond-like carbon (DLC) film create conducting tracks along their path. The conductivity of these channels is due to a conversion of diamond sp3 bonds to graphite sp2 bonds caused by the large energy deposited along the ion track. The tracks have a diameter of approximately 10 nm and represent conducting filaments embedded in the insulating diamond-like matrix. They might be used as electron field emitters in vacuum electronic devices.