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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29761

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Novel Intrinsic Conducting Polymer Current Limiting Device (CLD) for Surge Protection
In the past many uneconomic solutions for limitation and interruption of short-circuit currents in low power applications have been introduced, especially polymer switch based on the positive temperature coefficient of resistance (PCTR) concept. However there are many limitations in the active material, which consists of conductive fillers. This paper presents a significantly improved and simplified approach that replaces the existing current limiters with faster switching elements. Its elegance lies in the remarkable simplicity and low-cost processes of producing the device using polyaniline (PANI) doped with methane-sulfonic acid (MSA). Samples characterized as lying in the metallic and critical regimes of metal insulator transition have been studied by means of electrical performance in the voltage range from 1V to 5 V under different environmental conditions. Moisture presence is shown to increase the resistivity and also improved its current limiting performance. Additionally, the device has also been studied for electrical resistivity in the temperature range 77 K-300 K. The temperature dependence of the electrical conductivity gives evidence for a transport mechanism based on variable range hopping in three dimensions.
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[10] Inzelt, G., Applications of Conducting Polymers, in Conducting Polymers. 2008, Springer Berlin Heidelberg. p. 225-263-263.
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[14] Nechtschein, M., et al., Water effects in polyaniline: NMR and transport properties. Synthetic Metals, 1987. 18(1-3): p. 311-316.
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[20] Lux, F., Properties of electronically conductive polyaniline: a comparison between well-known literature data and some recent experimental findings. Polymer, 1994. 35(14): p. 2915-2936.

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