Thermistor behaviour in a semiconducting polymer-nanoparticle composite film

Murugaraj, P, Mainwaring, D and Mora Huertas, N 2006, 'Thermistor behaviour in a semiconducting polymer-nanoparticle composite film', Journal of Physics D: Applied Physics, vol. 39, no. 10, pp. 2072-2078.

Document type: Journal Article
Collection: Journal Articles

Title Thermistor behaviour in a semiconducting polymer-nanoparticle composite film
Author(s) Murugaraj, P
Mainwaring, D
Mora Huertas, N
Year 2006
Journal name Journal of Physics D: Applied Physics
Volume number 39
Issue number 10
Start page 2072
End page 2078
Total pages 7
Publisher Institute of Physics
Abstract Carbon nanoparticle-polyimide (BTDA-ODA) composite thin films were shown to have semiconducting behaviour with a pronounced negative temperature coefficient of resistance (NTC) over a temperature range 300-425 K, unlike conventional polymer-based composite films that show predominantly positive temperature coefficients of resistance. Electrical resistivity of the nanocomposite thin films decreased progressively by six orders of magnitude as the carbon volume fraction was increased from 1% to 10% and showed a characteristic composite behaviour in the smearing region prior to the percolation threshold. The dominant conduction mechanism was shown to be fluctuation induced tunnelling in the Coulomb gap with an optimum hop energy (Wopt) and a hop distance (Ropt) of about 23.1 ± 0.05 meV and 15.8 ± 0.04 nm, respectively for a 1 vol% nanocomposite, consistent with the T-1/2 behaviour in the model of Adkins (1989 J. Phys.: Condens. Matter. 1 1253) for cermets. The NTC parameters, characteristic of thermistor performance of these thin films, indicated that polymer based nanocomposites can potentially be considered for NTC thermistor applications. The materials presently studied, when compared with commercially available ceramic thermistors, were shown to exhibit smaller thermal sensitivity parameters, which originate from their smaller activation energy for charge transport. Polymer based semiconductive composites show promise for use in flexible and light-weight electronics, particularly since they can be easily mass manufactured and imprinted on microelectronic substrates.
Subject Electronic and Magnetic Properties of Condensed Matter; Superconductivity
Keyword(s) Thermistors
DOI - identifier 10.1088/0022-3727/39/10/015
ISSN 0022-3727
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