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- Title
Electrical-thermal switching effect in high-density polyethylene/graphite nanosheets conducting composites.
- Authors
Zhou, Lichun; Lin, Jinshan; Lin, Hongfei; Chen, Guohua
- Abstract
The nonlinear response in high-density polyethylene/graphite nanosheets conducting composites under increasing applied voltage is investigated. Under sufficient applied constant voltage, the resistance increases initially due to Joule heating effect and then eventually reaches a steady value with a characteristic thermal relaxation time τ h , which decreases as the applied field increases. The switch value, namely the ratio of the resistance under steady condition to the resistance of sample in linear regime, gradually increases with the increasing applied field. The threshold voltage ( V 0) at which the resistance start to increase with time scales with linear regime resistance ( R 0) of the sample as $$ V_{0} \sim R^{x}_{0} ,$$ with the exponent x = 0.78 ± 0.05. All the curves of R/ R 0 vs. V/ V 0 collapse to a similar curve with the function R/ R 0 = 1 + α( V/ V 0) θ . The results reveal that the threshold voltage value decreases with increasing graphite nanosheets content in the composites.
- Subjects
POLYETHYLENE; GRAPHITE; NANOSTRUCTURES; PERCOLATION; RELAXATION (Gas dynamics); PARTICLES
- Publication
Journal of Materials Science, 2008, Vol 43, Issue 14, p4886
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-008-2710-2