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Electrical conductivity of ion-irradiated carbon

Döbeli, M. and Jones, T. J. and Lee, A. and Livi, R. P. and Tombrello, T. A. (1991) Electrical conductivity of ion-irradiated carbon. Radiation Effects and Defects in Solids, 118 (4). pp. 325-339. ISSN 1042-0150. doi:10.1080/10420159108220759.

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Amorphous carbon films have been irradiated with Cl-ions with energies between 1 and 40 MeV, and the electrical conductivity of the material has been measured as a function of the ion dose. The room temperature conductivity is increased by nearly three orders of magnitude and saturates at a dose of about 10^(15)cm^(−2). The rate of conductivity change vs the ion energy can be explained by an ion track model. The temperature dependence of the conductivity between 100 and 300 K at low doses is in accordance with variable range hopping with a temperature exponent of 1/2. Hopping sites are assumed to be graphite rings or microcrystallites. At higher doses the variable range hopping is replaced by a metallic conductivity with a linear dependence on the temperature similar to that of polycrystalline graphite. This is probably due to the formation of complete percolation paths through the material by interconnection of the graphite regions. Estimates of the size of the crystallites, the hopping activation energy, and the cross section for producing crystallites in the material have been extracted.

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Additional Information:© 1991 Gordon and Breach, S.A. Received April 13, 1990; in final form September 15, 1991. Supported in part by the National Science Foundation (DMR88-11795). Supported in part by a fellowship from the Swiss National Science Foundation. We would like to thank A. Rice and S. Stryker for their help in running the tandem accelerator and building the necessary experimental equipment. M. Döbeli would like to express his gratitude towards the Swiss National Science Foundation for their financial support.
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Swiss National Science Foundation (SNSF)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20141024-140611580
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Official Citation:Electrical conductivity of ion-irradiated carbon† M. Döbeli, T. J. Jones, A. Lee, R. P. Livi, T. A. Tombrello Radiation Effects and Defects in Solids Vol. 118, Iss. 4, 1991
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50804
Deposited By: Tony Diaz
Deposited On:24 Oct 2014 22:44
Last Modified:10 Nov 2021 19:01

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