M. Bruzzi et al., Electrical conduction in nanostructured carbon films produced by supersonic cluster beam deposition, DIAM RELAT, 10(3-7), 2001, pp. 989-992
We present a study on electrical conduction in nanostructured carbon films
produced by deposition of a supersonic beam of neutral carbon clusters. The
electrical transport properties have been investigated by measuring the el
ectrical conductance both in-situ, during the film deposition, and ex-situ,
after the film exposure to ambient air. The I-V characteristic indicates a
strict ohmic behavior all over the measured electric field range up to (2
kV/cm). Changes in the electrical conductance have been observed due to gas
adsorption-desorption mechanisms. The exposure to air leads to a passivati
on of the film with an increase of resistivity up to similar to 0.1 G Omega
.cm. Current-temperature characteristics measured in vacuum in the tempera
ture range 150-400 K, both in-situ and ex-situ, indicate a thermally activa
ted conductivity with energy of similar to0.3 eV. (C) 2001 Elsevier Science
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