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Conductive tracks of 30-MeV C60 clusters in doped and undoped tetrahedral amorphous carbon

Krauser, J. and Gehrke, H.-G. and Hofsäss, H. and Trautmann, C. and Weidinger, A. (2013):
Conductive tracks of 30-MeV C60 clusters in doped and undoped tetrahedral amorphous carbon.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science Publishing, pp. 265-268, 307, ISSN 0168583X, [Online-Edition: http://dx.doi.org/10.1016/j.nimb.2012.12.081],
[Article]

Abstract

In insulating tetrahedral amorphous carbon (ta-C), the irradiation with 30-MeV C60 cluster ions leads to the formation of well conducting tracks. While electrical currents through individual tracks produced with monoatomic projectiles (e.g. Au or U) often exhibit rather large track to track fluctuations, C60 clusters are shown to generate highly conducting tracks with very narrow current distributions. Additionally, all recorded current–voltage curves show linear characteristics. These findings are attributed to the large specific energy loss dE/dx of the 30-MeV C60 clusters. We also investigated C60 tracks in ta-C films which were slightly doped with B, N or Fe during film growth. Doping apparently increases the ion track conductivity. However, at the same time the insulating characteristics of the pristine ta-C film can be reduced. The present C60 results are compared with data from earlier experiments with monoatomic heavy ion beams. The investigations were performed by means of atomic force microscopy including temperature dependent conductivity measurements of single ion tracks.

Item Type: Article
Erschienen: 2013
Creators: Krauser, J. and Gehrke, H.-G. and Hofsäss, H. and Trautmann, C. and Weidinger, A.
Title: Conductive tracks of 30-MeV C60 clusters in doped and undoped tetrahedral amorphous carbon
Language: English
Abstract:

In insulating tetrahedral amorphous carbon (ta-C), the irradiation with 30-MeV C60 cluster ions leads to the formation of well conducting tracks. While electrical currents through individual tracks produced with monoatomic projectiles (e.g. Au or U) often exhibit rather large track to track fluctuations, C60 clusters are shown to generate highly conducting tracks with very narrow current distributions. Additionally, all recorded current–voltage curves show linear characteristics. These findings are attributed to the large specific energy loss dE/dx of the 30-MeV C60 clusters. We also investigated C60 tracks in ta-C films which were slightly doped with B, N or Fe during film growth. Doping apparently increases the ion track conductivity. However, at the same time the insulating characteristics of the pristine ta-C film can be reduced. The present C60 results are compared with data from earlier experiments with monoatomic heavy ion beams. The investigations were performed by means of atomic force microscopy including temperature dependent conductivity measurements of single ion tracks.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 307
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Conducting ion tracks, Tetrahedral amorphous carbon, Cluster ion beam
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Apr 2014 09:18
Official URL: http://dx.doi.org/10.1016/j.nimb.2012.12.081
Additional Information:

18th International Conference on Ion Beam Modifications of Materials (IBMM2012)

Identification Number: doi:10.1016/j.nimb.2012.12.081
Funders: This work was financial supported by DFG (HO 1125/17-1 and KR 3298/1-1).
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