Sensitive and selective hydrogen gas sensor based on Sn doped NiO nanoparticles

摘要

Authors present the influence of Sn-doping on the structural, optical and hydrogen gas sensing properties of NiO nanoparticles. The synthesized samples were characterized by X-ray diffraction, field emission scanning electron microscopy and photoluminescence spectroscopy. X-ray diffraction results indicate the formation of cubic structure of undoped and Sn doped NiO nanoparticles. Field emission scanning electron microscopy has been employed to explore the morphology of the samples. Photoluminescence spectroscopy probe has revealed large amount of defects in Sn doped NiO nanostructures. It has been observed that Sndoped NiO based sensor displayed enhanced sensor response and excellent selectivity towards 100 ppm of hydrogen gas. The enhanced sensor response of Sn doped NiO based sensor can be attributed to smaller crystallite size and large number of defects in doped sample. It is speculated that the sensor fabricated from Sn doped NiO nanoparticles can be used to sense hydrogen leakage.