文摘
A novel Hub>2ub> gas sensor based on a SnOub>2ub> nanostructure was operated at room temperature (RT) (25°C). The SnOub>2ub> nanostructure was grown on Alub>2ub>Oub>3ub> substrates by a sol–gel spin coating method. The structural characteristics, surface morphology, and gas sensing properties of the SnOub>2ub> nanostructure were investigated. Thin film annealing at 500°C produced a high-quality SnOub>2ub> nanostructure with a crystallite size of 33.98 nm. A metal–semiconductor–metal gas sensor was fabricated using the SnOub>2ub> nanostructure and palladium metal. The gas sensor exhibited a sensitivity of 2570% to 1000 ppm Hub>2ub> gas at RT. The sensing measurements for Hub>2ub> gas at different temperatures (RT to 125°C) were repeatable␣for 50 min. Sensor sensitivity was tested under different Hub>2ub> concentrations (150 ppm, 250 ppm, 375 ppm, 500 ppm, and 1000 ppm) at different operating temperatures. Adding glycerin to the sol solution increased the porosity of the SnOub>2ub> nanostructure surface, which increased the adsorption/desorption of gas molecules which leads to the high sensitivity of the sensor. Therefore, this Hub>2ub> gas sensor is a suitable␣portable␣RT gas sensor.