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Synthesis and hydrogen gas sensing properties of pure NiS and Au-coated NiS

NiS nanostructures were synthesized using a microwave-assisted wet chemical hydrothermal technique. XRD analysis of the product obtained after washing the product and drying it at 90°C for 6 hours confirmed that α-NiS and β-NiS phases were formed. Au nanostructures were deposited on the surface of the NiS product via a microwave-assisted impregnation technique. H2 gas sensitivity of NiS or Au/NiS was measured by recording a change in resistance of the sample with time in the presence and absence of the analyte gas, at 300°C. The materials were exposed to H2 gas of different flow rates relative to N2 gas flow. Fast response due to reduced H2 gas flow over similar time intervals was observed which was suggestive of a reliable sensing behavior of the Au/NiS material. Post sensing phase analysis of the materials showed that NiS phase was reduced to the more stable phase of nickel sulfide (Ni3S2).