Preparation of PVP Encapsulated Pd:WO3 Nanocomposites for H2 Gas Sensing

This paper reports on the $\mathrm{H}_{2}$ gas sensing technique which has great importance in various practical applications. One of the current challenges lies in the $\mathrm{H}_{2}$ gas sensing technique is a high-temperature operation that increases explosion risk. To this objective, the room temperature chemochromic $\mathrm{H}_{2}$ sensing technique is an alternative, yet the development is not explored widely. We developed a novel quasi-reversible $\mathrm{H}_{2}$ sensing nanocomposite using an optimized ratio of Pd, WO 3 , and polyvinylpyrrolidone (PVP). It provides rapid eye-readable chemochromic response with a long recovery time for multiple repeated cycles, which has potential importance in industrial monitoring.