Abstract
With increasing exposure to ethanol in various scenarios, including hand sanitizers that combat bacteria and viruses, energy-efficient miniaturized sensors capable of detecting excessive concentrations of ethanol are required in the fields of disinfection and chemical storage. Modified perovskite-type oxides with ABO3 structures are particularly attractive because they can be appropriately modified and have been used in heterogeneous catalysis and gas sensors. In this study, we designed and manufactured a novel thin-film-type LaCeCoO3 gas sensor using lithography technology and precursor-solution doping. The samples exhibited morphologies that contain randomly oriented nanostructures and short rods; the particle size was observed to decrease with Ce-addition. Room-temperature gas-sensing characterization studies revealed high reproducibility for the detection of ethanol. La0.96Ce0.04CoO3 exhibited superior stability and sensitivity, with a high impedance, |Z|, of ∼120 kΩ and a Δ|Z| of up to 77%, with response and recovery times of 16 and 8 s, respectively. This study provides a rational method for the development of LaCeCoO3 as a semiconducting material for ethanol gas-sensing applications.
Highlights
The gas-sensing properties of LaCoO3 have been modified by combining it with precious metals, such as Ag21,22 and Pd,23,24 which led to excellent catalytic capacities
Shingange et al reported that LaCoO3 has an excellent selectivity to discriminate the ethanol gas among the interfering gases (CO2, CH4, CH3COCH3, C3OH, C3H8O, NH3, and NO2), which indicates that the LaCoO3 based sensor is very promising in the production of ethanol sensors with low power consumption
In the absence of Ce [x = 0, Fig. 3(a)], LaCoO3 is composed of tiny particles that are 50 nm in size on average
Summary
Ethanol is a volatile organic compound (VOC) that is ever present in our daily lives through its use in the chemical, food, and pharmaceutical industries, as well as in industrial production. ethanol is associated with several adverse effects, including skin irritation, carcinogenicity, toxicity, liver damage, and drunk-driving accidents. Ethanol is considered a toxic and hazardous gas that has adverse effects on humans, and higher ethanol-monitoring requirements have been proposed for living and production environments. Perovskite-type oxides with ABO3 structures have attracted particular attention because of their excellent physical and chemical properties.. Perovskite-type oxides with ABO3 structures have attracted particular attention because of their excellent physical and chemical properties.5 They have been used in heterogeneous catalysis and gas sensors.. Some gas sensors based on LaCoO3 nanostructures have been successfully fabricated by high-energy ball milling and the citrate method.. Shingange et al reported that LaCoO3 has an excellent selectivity to discriminate the ethanol gas among the interfering gases (CO2, CH4, CH3COCH3, C3OH, C3H8O, NH3, and NO2), which indicates that the LaCoO3 based sensor is very promising in the production of ethanol sensors with low power consumption.. We fabricated a series of nanostructured ethanol gas sensors using lithography technology and precursor solution doping, and their sensing characteristics were examined at room temperature.
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