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Abstract: La x Sr1− x FeO3 nanofibers were synthesized via electrospinning and characterized by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The diameters of the La x Sr1− x FeO3 nanofibers produced were in the range of 30–80nm. When the La/Sr ratio was 0.7:0.3, La0.7Sr0.3FeO3 nanofibers showed high and rapid response and good repeatability to 500ppm ethanol. At 185°C, the response and recovery time of La0.7Sr0.3FeO3 nanofiber were 11s and 21s, respectively. The La0.7Sr0.3FeO3 nanofibers are promising sensitive materials for ethanol detecting. [Copyright &y& Elsevier]

Abstract: SnO2 nanosheets were synthesized by a hydrothermal method at 200°C using stannic chloride hydrate and sodium hydroxide as starting materials. The as-synthesized nanoparticles and nanosheets are characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. Most importantly, the SnO2 nanosheets sensor exhibits high response, low detection limit and fast response to ethanol. The gas response of the SnO2 nanosheets to 100ppm ethanol was 39.6 at 300°C, which was 3.6 and 6.1 times higher than that of the nanospheres-like and the nanoparticles, respectively. Response and recovery times were 1 and 9s when the sensor was exposed to 20ppm ethanol at an operating temperature of 300°C. [Copyright &y& Elsevier]