1. Improving the formaldehyde gas sensing performance of the ZnO/SnO2 nanoparticles by PdO decoration
- Author
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Zhan Zili, Xue Wan, Li Feihu, Jiao Shuaishuai, Zhang Cuimin, and Meng Bo
- Subjects
010302 applied physics ,Materials science ,Precipitation (chemistry) ,Formaldehyde ,Nanoparticle ,Working temperature ,Crystal structure ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Catalysis ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,0103 physical sciences ,Electrical and Electronic Engineering ,Rapid response - Abstract
In this work, a series of PdO catalytic ZnO/SnO2 (PdO–ZSO) nanoparticles have been synthesized by a two-step approach including a low-temperature (− 10 °C) precipitation followed by a PdO dipping process. The composition, surface morphology, and crystal structure of the as-obtained samples were characterized by multi-techniques. And the gas-sensing properties toward formaldehyde (HCHO) were evaluated. The results indicate that the PdO–ZSO nanoparticles exhibit high sensitivity (5.4) and rapid response (37 s)/recovery (87 s) to 10 ppm HCHO at 140 °C through optimizing the ratio of PdO, ZnO, and SnO2 in nanoparticles. Comparing with the traditional SnO2 sensor without ZnO and PdO, the sensors’ working temperature is much lower and the response–recovery speed is also improved. In addition, the specific sensing mechanism was discussed preliminarily.
- Published
- 2019