Abstract
Nanocrystallite ferrites samples with general formula Mg1-xCdx Fe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8, 1) were prepared by oxalate co-precipitation method from high purity sulphates. The samples were characterized by XRD, SEM and FT-IR techniques. The phase identification of powder reveals single phase cubic spinel nature of materials. The gas sensing properties were studied for ethanol (C2H5OH), liquid petroleum gas (LPG) and chlorine (Cl2). The MgFe2O4 is sensitive to LPG (~ 80%) followed by Cl2 (~75%) and less to ethanol (~ 58%) at an operating temperature of 225oC. The sample with x = 0.4 has highest sensitivity at operating temperature 225oC for LPG (~ 78%). It shows good sensitivity at operating temperature at 198oC for Cl2 (~75%) and ethanol (~ 65%). The CdFe2O4 sensor (x=1) exhibits very high sensitivity (85%) and good selectivity to ethanol than other tested gases such as LPG (~ 35%) and Cl2 (~ 30%). The response and recovery time decreases with increase in Cd2+ content for LPG, Cl2 and ethanol. The shorter response is observed to CdFe2O4 for LPG, Cl2 and ethanol.
Highlights
The sensors are the devices which convert physical or chemical quantity into electrical signals convenient to use [1]
The gas sensing was investigated by Iftimie et al [9] at operating temperature between 300 to 500 oC for ethyl alcohol, methane, liquefied petroleum gas, formaldehyde and ammonia. They reported that the grain size, surface area and pores plays an important role for gas sensing purpose
We report investigations of sensing properties of Mg-Cd ferrites for gases such as liquid petroleum gas (LPG), Cl2 and C2H5OH, synthesized by oxalate coprecipitation method
Summary
The sensors are the devices which convert physical or chemical quantity into electrical signals convenient to use [1]. The electron are drawn from the oxide resulting in resistance the oxygen adsorption– desorption mechanism is not employed to sense the Cl2 gas and in the present case chlorine sensor surface is favorable mechanism [20, 21].
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