In situ sulfur-doped mesoporous tungsten oxides for gas sensing toward benzene series

Abstract

Benzene series as highly toxic gases have inevitably entered human life and produce great threat to human health and ecological environment, and thus it is distinctly meaningful to monitor benzene series with quickly, real-time and efficient technique. Herein, novel sulfur-doped mesoporous WO3 materials were synthesized via classical in-situ solvent evaporation induced co-assembly strategy combined with doping engineering, which possessed highly crystallized frameworks, high specific surface area (40.9–63.8 m2/g) and uniform pore size (∼18 nm). Benefitting from abundant oxygen vacancy and defects via S-doping, the tailored mesoporous S/mWO3 exhibited excellent benzene sensing performance, including high sensitivity (50 ppm vs. 48), low detection limit (ca. 500 ppb), outstanding selectivity and favorable stability. In addition, the reduction of band gap resulted from S-doping promotes the carrier migration in the sensing materials and the reaction at the gas–solid sensing interfaces. It provides brand-new approach to design sensitive materials with multiple reaction sites.