Abstract
Resistor-type ammonia gas sensors with different architectures of porous NiO nanosheets are comprehensively studied and demonstrated for their sensing characteristics. During the synthesis process, the amount of nickel nitrate hexahydrate can vary the morphology of NiO nanostructure. Holes on the NiO nanosheets increase the surface area of the material and enhance the sensing performances of the sensor. Among the different sensors, dispersed distribution has more surface area to react with ammonia gas. Experimentally, the dispersed porous NiO nanosheets ammonia gas sensor exhibits higher sensing response ratio of 87.17% to 15 ppm NH3 gas under 150 °C. Fast response time and high response ratio to low concentration ammonia gas are shown in the dispersed sensor. Based on the advantages of its simple structure and relatively easy fabrication, the material is beneficial to accurate ammonia sensing applications.
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