Preparation of Co3O4 nanorods and their gas-sensitivity performance at room temperature
Using Co(NO)3·6H2O as the cobalt source,CO(NH2)2 as the precipitant,polyvinylpyrrolidone as the dispersant,and NH4F as the precursor fluoride source,Co3O4 nanorods were prepared via a hydrothermal method,followed by the fabrication of a calorimetric gas sensor.Based on the characterization results from X-ray diffraction and field emission scanning electron microscopy regarding the material's crystal structure,grain size,and morphology,the Co3O4 exhibited nanorods were porous with a grain size of 22.2 nm,particle sizes ranging from 35 to 69 nm,a length of approximately 4.7 μm,diameter range of 220 to 300 nm,and an aspect ratio between 15.7 and 21.4.Gas sensing tests revealed that at 80℃,the gas sensing element based on the Co3O4 nanorods exhibited a sensitivity of 465.43 towards 0.1 g/L ethanol,while at 25℃,it was only 2.14.Introducing 0.02 g/L ozone(O3)as ambient gas increased the sensitivity of the gas sensor to 923.16 at 80℃and 7.64 at 25℃,showing enhanced performance.The recovery process of the gas sensor could be achieved within 3 minutes by alternately switching between O3 and the test gas,demonstrating the repeatability of gas sensing detection at room temperature.The introduction of O3 enabled the Co3O4 gas sensor to detect ethanol sensitively at room temperature.
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