The Electrical-Thermal Switching in Carbon Black-Polymer Composites as a Local Effect

Details The Electrical-Thermal Switching in Carbon Black-Polymer Composites as a Local Effect The Electrical-Thermal Switching in Carbon Black-Polymer Composites as a Local Effect

2003-06-11

arxiv.org/abs/cond-mat/0306267v2

Phys. Rev. Lett. 90, 236601 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages, 5 figures,Typographic correction

Scientific paper

10.1103/PhysRevLett.90.236601

Following the lack of microscopic information about the intriguing well-known electrical-thermal switching mechanism in Carbon Black-Polymer composites, we applied atomic force microscopy in order to reveal the local nature of the process and correlated it with the characteristics of the widely used commercial switches. We conclude that the switching events take place in critical interparticle tunneling junctions that carry most of the current. The macroscopic switched state is then a result of a dynamic-stationary state of fast switching and slow reconnection of the corresponding junctions.

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