H2S Sensing Characteristics of NiO Nanopetal Film

NiO is one of the most candidate materials for hydrogen sulfide (H 2 S) sensing due to its catalytic activity for the oxidation reaction of H 2 S, and high affinity of Ni in the NiO to S for the H 2 S adsorption. Porous NiO nanopetal film composed of interconnected thin nanosheets was grown by a facile template-free hydrothermal method at the relatively low temperature of 105 °C, and its H 2 S sensing characteristics was investigated in the temperature range of 25 °C to 400 °C. The NiO nanopetal film based device showed a reliable response to wide range of concentration from 10 ppm to 500 ppm H 2 S ambient at 400 °C. The sensor started to exhibit the responsivity to 500 ppm H 2 S gas at 200 °C. The maximum responsivity of the sensor with NiO nanopetals was 400% for 500 ppm H 2 S exposure at 300 °C. The NiO nanopetal film grown by the simple low-cost hydrothermal synthesis has high potential in applications of chemical, medical, energy, and food industries.