Enhanced NOx Gas Sensing Properties of Ordered Mesoporous WO3/ZnO Prepared by Electroless Plating

Abstract A kind of novel n–n combined ordered mesoporous WO 3 /ZnO (OM‐WO 3 /ZnO) sensor are successfully fabricated in this study. A soft‐template method is used to synthesize the ordered mesoporous ZnO matrix. Surfaces of the ZnO matrix are innovatively modified using silane coupling agent (mark as: OM‐ZnO‐Si), and then a layer of WO 3 film is assembled on the surfaces of the OM‐ZnO‐Si by chemical plating method for the first time, and the OM‐WO 3 /ZnO material is obtained. The prepared OM‐WO 3 /ZnO sample shows a kind of regular hexagon‐sheet structure. The prepared OM‐WO 3 /ZnO sensor shows the much better response, much shorter response time, much lower detection limit, and the more excellent selectivity toward NO x gas. When oxynitride (NO x ) gas concentration is 100 ppm, the response reaches to 82.64%, the response time is only 6 s at room temperature. The detection limit is only 0.01 ppm. The unique loose porous structure and the synergistic effect of the n–n heterojunction structure endow the prepared OM‐WO 3 /ZnO material with the superior gas sensing properties. The n–n combined OM‐WO 3 /ZnO material shows the vast development potential in gas sensor field.