Highly Ordered Mesoporous Tungsten Oxides with a Large Pore Size and Crystalline Framework for H2 S Sensing.

Angewandte Chemie (International ed. in English)

PubMedID: 24990323

Li Y, Luo W, Qin N, Dong J, Wei J, Li W, Feng S, Chen J, Xu J, Elzatahry AA, Es-Saheb MH, Deng Y, Zhao D. Highly Ordered Mesoporous Tungsten Oxides with a Large Pore Size and Crystalline Framework for H2 S Sensing. Angew Chem Int Ed Engl. 2014;.
An ordered mesoporous WO3 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 WO3 materials have a large uniform mesopore size (ca. 10.9 nm) and a high surface area (ca. 121 m(2) ?g(-1) ). The mesoporous WO3 -based H2 S gas sensor shows an excellent performance for H2 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 H2 S sensing.