Abstract
The YFeO3 (12 h, 24 h, 48 h and 72 h) microcrystals were prepared by hydrothermal process. Structural characterization using X-ray diffraction confirms the orthorhombic perovskite of the synthesized materials. YFeO3 based gas sensor has good selectivity to formaldehyde. The response value of YFeO3 (72 h) sensor is up to 318 for 100 ppm formaldehyde at room temperature. Furthermore, YFeO3 has an ultra-fast response-recovery time of about 6.3 s/0.9 s and exhibits excellent cycle repeatability and stability. This trait can play significant practical role in kind of sensors with real-time detectability. Further SEM and XPS analysis suggest that enhanced sensing property can be related to the uniform hierarchical structure and high oxygen vacancies. Our research indicates that adjusting the experimental approach can alter the structural and sensing properties of the sample.
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