| Summary: | Tin dioxide (SnO<sub>2</sub>) nanofibers and cerium dioxide (CeO<sub>2</sub>) nanoparticles were prepared by electrospinning and hydrothermal methods, respectively. The morphology and structure of the synthesized SnO<sub>2</sub>/CeO<sub>2</sub> samples were characterized by a variety of methods. The gas-sensing properties of the SnO<sub>2</sub>/CeO<sub>2</sub> sensor were investigated for liquefied petroleum gas (LPG) detection at room temperature. Compared with pure SnO<sub>2</sub> nanofibers, the SnO<sub>2</sub>/CeO<sub>2</sub> composite sensor showed a much higher response and shorter response time for LPG sensing after doping with CeO<sub>2</sub> nanoparticles. Furthermore, the SnO<sub>2</sub>/CeO<sub>2</sub> composite sensor had better resistance to interference from humidity than the pure SnO<sub>2</sub> sensor. The significantly enhanced sensing performance of the SnO<sub>2</sub>/CeO<sub>2</sub> composite sensor for LPG can be attributed to the modification with CeO<sub>2</sub> to increase oxygen vacancies and form a heterostructure with SnO<sub>2</sub> nanofibers. Meanwhile, the LPG detection circuit was built to realize real-time concentration display and alarm for practical applications.
|
|---|