Enhanced Hydrogen Sulfide Sensing Properties Of Pt-Functionalized Alpha-Fe2o3 Nanowires Prepared By One-Step Electrospinning

Pure alpha-Fe2O3 nanowires (NWs) and 0.5, 1 and 3 mol% Pt-functionalized alpha-Fe2O3 nanowires have been successfully synthesized via simple homotaxial electrospinning methods. The nanostructures and morphologies of the as-obtained nanowires were characterized through various experimental techniques. The morphologies of the as-obtained samples and the chemical state of Pt element were characterized by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectrum (XPS). Furthermore, comparative gas sensing investigations about the series of Pt-functionalized alpha-Fe2O3 nanowires and pure alpha-Fe2O3 nanowires were performed to demonstrate the superior sensing properties of the Pt-functionalized samples. According to the experimental results, the sensor with 1 mol% Pt-functionalized alpha-Fe2O3 nanowires exhibited the highest response (157-10 ppm H2S) and noticeable selectivity at 175 degrees C, which could be attributed to the chemical sensitization (catalytic oxidation) of Pt on alpha-Fe2O3, and the porous structure of the nanowires. (C) 2017 Published by Elsevier B.V.