Gas-Sensing Performance of Gadolinium Ferrates with Rod and Butterfly Morphologies
2023
Jianbo Lin | Ningning Liu | Tongxiao Zhang | Hongjian Liang | Guozheng Zhang | Xiaofeng Wang
There is an urgent need to develop a low-cost and high-performance gas sensor for industrial production and daily life. Perovskite-type oxides are appropriate materials for resistive gas sensors. In this paper, two gas-sensing materials of gadolinium orthoferrite (GdFeO<sub>3</sub>) with rod and butterfly morphologies were obtained by annealing the corresponding precursors at 800 °C in a muffle furnace for 3 h. The precursors of GdFe(CN)<sub>6</sub>·4H<sub>2</sub>O with novel morphologies were prepared by a co-precipitation method at room temperature. The materials were evaluated in terms of their structure, morphology, and gas-sensing performance. The gas sensor based on GdFeO<sub>3</sub> rods showed a better sensing performance than the sensor based on GdFeO<sub>3</sub> butterflies. It exhibited the largest response value of 58.113 to 100 ppm n-propanol at a relatively low operating temperature of 140 °C, and the detection limit was 1 ppm. The results show that the GdFeO<sub>3</sub> rods-based sensor performed well in detecting low concentration n-propanol. The satisfactory gas-sensing performance of the GdFeO<sub>3</sub> rods-based sensor may be due to the porous structure and the large percentages of defect oxygen and adsorbed oxygen (37.5% and 14.6%) on the surface. This study broadens the application of GdFeO<sub>3</sub> in the gas sensor area.
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