Abstract
Sensor design for environmental pollution monitoring is a great challenge, as the selectivity and sensitivity of the sensor for a desired pollutant gas should be high enough to be detected at low concentrations. This work presents an ethanol gas sensor using inter-digital capacitive (IDC) structure coated with Cobalt ferrite (CoFe2O4) nanocomposite as gas sensing material. CoFe2O4 nanocomposite are prepared by sol gel auto-combustion method. Gas sensing properties of the IDC structure are investigated under various gas concentrations. The sensor exhibits high sensitivity of the order of 100 nF/ppm with a response of 1.4% for ethanol gas at room temperature with a very low gas concentration of 7 ppm, compared to 0.4% and 0.2% respectively for methanol and acetone vapors. The response and recovery times of the sensor are about 180 s. The superior activity of the sensor indicates possible industrial and commercial applications.
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