Ni/SnO2 xerogels via epoxide chemistry: potential candidate for H2S gas sensing application

We report a versatile epoxide assisted synthesis route of developing Ni/SnO2 xerogels and their use as efficient H2S gas sensors. Instead of expensive, non-aqueous and complicated organometallic precursors, epoxide route utilizes easy to handle salts as precursors (tin and nickel nitrates, in the present case) and epoxide (propylene oxide, in the present case) as a gelation agent. The obtained Ni/SnO(2)xerogels with 1-4 mol% Ni doping, were analyzed using various physico-chemical techniques such as XRD, FE-SEM, TEM/HRTEM, EDAX, UV-Vis and FTIR spectroscopy. The developed nanomaterials showcase excellent physico-chemical as well as H2S gas sensing properties. Amongst the Ni doped SnO2 xerogels, 3 mol% Ni/SnO2 exhibited enhanced H2S response (from Ra/Rg value 5 to 11.5), and reduction in the operating temperature (from 325 to 275 degrees C). It showed a quick response of similar to 15 s and recovery within similar to 30 s. Almost 80.50% of its original efficiency after 60 days of shelf life, was exhibited with high stability. The developed route of Ni/SnO2 xerogels proved its design for efficient H2S gas sensing, and have considerable potential for industrial use.

Automated summary

A versatile epoxide assisted synthesis route was developed for Ni/SnO2 xerogels as efficient H2S gas sensors. The nanomaterials exhibited excellent physico-chemical properties and high stability, with 3 mol% Ni/SnO2 showing enhanced H2S response and lowered operating temperature. The developed route of Ni/SnO2 xerogels demonstrated efficient design for H2S gas sensing and potential for industrial use.