Černák, J., Helgesen, G., Hage, F. S. and Kováč, J. (2014) Magnetoresistance of composites based on graphitic discs and cones. Journal of Physics D: Applied Physics, 47(33), 335305. (doi: 10.1088/0022-3727/47/33/335305)
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Abstract
We have studied the magnetotransport of conical and disc-shaped nanocarbon particles in magnetic fields |B| ≤ 9 T at temperatures 2 ≤ T ≤ 300 K to characterize electron scattering in a three-dimensional (3D) disordered material of multilayered quasi 2D and 3D carbon nanoparticles. The microstructure of the particles was modified by graphitization at temperatures of 1600 and 2700 °C. We find clear correlations between the microstructure as seen in transmission electron microscopy and the magnetotransport properties of the particles. The magnetoresistance measurements showed a metallic nature of samples and positive magnetoconductance which is a signature of weak localization in disordered systems. We find that the magnetoconductance at low temperatures resembles quantum transport in single-layer graphene despite the fact that the samples are macroscopic and 3D, consisting of stacked and layered particles, which are randomly oriented in the bulk sample. This graphene-like behaviour is attributed to the very weak interlayer coupling between the graphene layers.
| Item Type: | Articles |
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| Additional Information: | This work was supported by SAS Centre of Excellence: CFNT MVEP and by Research Council of Norway grant no 191621/F20, University Science Park TECHNICOM for Innovation Applications Supported by Knowledge Technology, ITMS: 26220220182, supported by the Research&Development Operational Programme funded by the ERDF. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hage, Dr Fredrik Sydow |
| Authors: | Černák, J., Helgesen, G., Hage, F. S., and Kováč, J. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Journal of Physics D: Applied Physics |
| Publisher: | IOP Publishing |
| ISSN: | 0022-3727 |
| ISSN (Online): | 1361-6463 |
| Copyright Holders: | Copyright © 2014 The Authors |
| First Published: | First published in Journal of Physics D: Applied Physics 47(33): 335305 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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