Construction of NiO@ZnSnO3 hierarchical microspheres decorated with NiO nanosheets for formaldehyde sensing
Abstract The composite of ZnSnO 3 hierarchical microspheres decorated with NiO nanosheets have been synthesized by a facile solution-based chemical precipitation at 85 °C followed by self-assembly and annealing, which is low-cost and high-yield. The structure, morphology, composition and specific surface of composite were characterized by XRD, SEM, TG, XPS and BET analysis, respectively. The gas sensing experiments show that the sensor based on composite of NiO/ZnSnO 3 mole ratio of 1:10 not only exhibits high response of 2.2 and 10.4 to 0.1 and 1 ppm formaldehyde, respectively and good selectivity to some of reducing gases, but also has low detection limit and rapid response and recovery at operating temperature of 85 °C. The mechanism of composite enhancing gas sensing was also discussed in detail, which can be ascribed to the large specific surface area of composite and the formation of p-n heterojunctions at the interface between NiO and ZnSnO 3 . Highlights ZnSnO 3 microspheres were synthesized by precipitation followed by self-assembly. This heterojunctions between ZnSnO 3 and NiO were synthesized for the first time. The composite enhances sensing response, selectivity and response rate to HCHO. The enhancement of gas sensing is ascribed to formation of p-n heterojunctions. Graphical abstract NiO@ZnSnO 3 hierarchical microspheres have been synthesized by a facile chemical precipitation and self-assembly followed by annealing. The surface decoration of NiO nanosheets not only enhances the response of ZnSnO 3 microspheres but also shows rapid response and recovery to 1 ppm HCHO at 85 °C, which is attributed to the large specific surface area of composite and formation of p-n heterojunctions at interface in composite. [DISPLAY OMISSION]
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