Synthesis and Characterization of Nickel Ferrite (NiFe^sub 2^O^sub 4^) Nanoparticles with Silver Addition for H^sub 2^S Gas Detection

The fabrication and testing of H^sub 2^S gas sensors using nickel ferrite (NiFe^sub 2^O^sub 4^) nanoparticles and silver is presented here. The nanoparticles were prepared by chemical co-precipitation and silver was added by impregnation. The sensor response was measured at different H^sub 2^S concentrations. At 200 ppm H^sub 2^S, results indicate a 0.18 efficiency as compared to 0.45 for NiFe^sub 2^O^sub 4^ and NiFe^sub 2^O^sub 4^-5 % wt. Ag, respectively. Characterization by XRD indicates an average crystal size of 19 nm. Electron Microscopy in Scanning and Transmission mode indicates agglomerates with sponge-like structure and two-dimensional slabs in the range of 11~39 nm. [PUBLICATION ABSTRACT]