Facile fabrication and enhanced gas sensing properties of ZnSnO3/NiO heterostructures

The sensing performance of gas sensitive materials can be improved by adjusting their microstructure and electronic structure. In this work, ZnSnO3-NiO heterostructures are synthesized by co-precipitation and annealing treatment. The crystal structure, morphology and surface chemical composition of the samples are characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Subsequently, the performance of the sensors based on the above samples is tested. The results show that the sensor has the best performance when the molar ratio of Ni/Zn is 1:2. Specifically, the 2ZnSnO(3)-NiO-based sensor shows not only high response value (21.1) and fast response speed (1 s) to 100 ppm acetone at 260 degrees C, but also good repeatability and long-term stability. In addition, the improved gas sensing mechanism is analyzed in detail. Therefore, ZnSnO3-NiO heterostructures are expected to be a candidate material for the detection of acetone gas.

Automated summary

The sensing performance of gas sensitive materials can be improved by adjusting their microstructure and electronic structure. In this study, ZnSnO3-NiO heterostructures were successfully synthesized and their performance was tested. The results showed that the sensor had the best performance at a Ni/Zn molar ratio of 1:2, with high response value, fast response speed, good repeatability, and long-term stability.