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    Time-dependent electrical properties of carbon nanotube yarns

    Date
    2015-06
    Author
    Misak, Heath Edward
    Mall, Shankar
    Metadata
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    Citation
    Misak, Heath Edward; Mall, S. 2015. Time-dependent electrical properties of carbon nanotube yarns. New Carbon Materials, vol. 30:no. 3, June 2015:pp 207–213
    Abstract
    Carbon nanotubes (CNTs) are projected as a desirable option to transmit electrical power where specific conductivity. is an important consideration. A CNT-yarn was therefore characterized for its ability to transmit power as a function of time. A current-voltage (I-V) relationship was established that showed three distinct regions: linear, non-linear and finally its degradation. The linear region shows a low and constant resistance. The output current did not change with time when the applied constant voltage was in the linear region of the I-V relationship. However, when the applied constant voltage was in the non-linear region the current decreased exponentially and leveled off with time. Under constant current tests, voltage increased only when current level was in the non-linear region. These time-dependent electrical conducting properties can be accounted for by short circuits occurring from the development of a localized red-hot spots in the CNT-yarn in the non-linear region, leading to thermal degradation, as revealed by thermal imaging of the yarn, thermal gravimetric analysis of the CNTs, and SEM images and EDAX of the thermally degraded CNT-yarn.
    Description
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    URI
    http://dx.doi.org/10.1016/S1872-5805(15)60186-X
    http://hdl.handle.net/10057/11381
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