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Resistivity of Metal Oxides

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Cobalt ferrite nanoparticles prepared by chemical co-precipitation route were synthesized and characterized using XRD , infra-red spectroscopy and electron paramagnetic resonance spectroscopy. These nanoparticles can be used for sensing ethanol vapours. The physical properties relevant to sensing aspects are investigated. The resistance, responsiveness, sensitivity, optimum working temperature and response time of cobalt ferrite nanoparticle based semiconductor ethanol vapour sensor are obtained from the response and recovery curves. They are practically the same with minor deviations in the studied temperature range. The results show that the largest resistance increase was observed in the 25ºC measurements. On varying the alcohol vapour concentration, the resistance of the sensor varies slightly in a particular temperature operating range. The mechanism for sensing ethanol will also be described.

This talk is part of the Thin Film Magnetic Talks series.

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