Highly Ordered Mesoporous Tungsten Oxides with a Large Pore Size and Crystalline Framework for H₂S Sensing

Abstract

Abstract An ordered mesoporous WO 3 material with a highly crystalline framework was synthesized by using amphiphilic poly(ethylene oxide)‐ b ‐polystyrene (PEO‐ b ‐PS) diblock copolymers as a structure‐directing agent through a solvent‐evaporation‐induced self‐assembly method combined with a simple template‐carbonization strategy. The obtained mesoporous WO 3 materials have a large uniform mesopore size (ca. 10.9 nm) and a high surface area (ca. 121 m 2 g −1 ). The mesoporous WO 3 ‐based H 2 S gas sensor shows an excellent performance for H 2 S sensing at low concentration (0.25 ppm) with fast response (2 s) and recovery (38 s). The high mesoporosity and continuous crystalline framework are responsible for the excellent performance in H 2 S sensing.