Ethanol-sensing properties of potassium bromide/multi-walled carbon nanotube composites
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The work reported in this paper is related to the fabrication and electrical characterization of multi-walled carbon nanotubes (MWNT)-based solid composites pellets with potential application as gas sensor at room temperature, using potassium bromide as supporting material. Results show an electrical conductivity of the composites as a function of the MWNT loading following a power law associated with a percolation phenomenon. A variation of the electrical resistance of the composites as a function of ethanol concentration in a nitrogen atmosphere has also been observed, allowing detection of ethanol from about hundred of ppm. It is also shown the existence of an optimal MWNT loading for which the composite reaches its best ethanol-sensing performances.
KeywordsCarbon Nanotubes Ethanol Concentration Percolation Threshold Ethanol Vapour Digital Multimeter
The authors wish to thank Benoit Duponchel for the SEM images and Fabrice Cazier and all the staff of Centre Commun de Mesures (CCM) for their help to the realization of the gas-sensing measurement setup.