Lead(II) acetate [Pb(Ac)2] reacts with hydrogen sulfide to form brownish lead sulfide precipitates. Traditionally, Pb(Ac)2 test papers have been used to detect H2S gas leaks in industrial settings, but they only detect concentrations as low as 5 ppm. However, diagnosing halitosis requires sensors that can detect H2S down to 1 ppm. This study presents high surface area and porous Pb(Ac)2 anchored nanofibers (NFs) that improve on conventional Pb(Ac)2-based H2S sensors. By mixing lead(II) acetate and polyacrylonitrile (PAN) in dimethylformamide (DMF) solvent at 85 °C, a uniform dispersion of fine liquid droplets is achieved. Electrospinning this solution results in Pb(Ac)2 anchored NFs, which have high thermal stability, numerous reaction sites, and enhanced diffusion of H2S. This new material can detect H2S at levels as low as 400 ppb at 90% relative humidity, making it a highly effective colorimetric sensor for halitosis diagnosis.-Journal cover design by scapiens
[Scientific Journal cover design] Low-Thermal-Budget Fluorite-Structure Ferroelectrics for Future Electronic Device Applications
In article number 2100028, Jiyoung Kim, Si Joon Kim, and their team review key factors involved in developing fluorite-structure ferroelectrics
