首页|Co+3 substituted gadolinium nano-orthoferrites for environmental monitoring: Synthesis, device fabrication, and detailed gas sensing performance
Co+3 substituted gadolinium nano-orthoferrites for environmental monitoring: Synthesis, device fabrication, and detailed gas sensing performance
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NSTL
Elsevier
The development of gas sensors with high sensitivity, stability, and selectivity is vital in detecting hazardous gas leaks and monitoring air pollution. The perovskite comprises a stable chemical structure and offers multifunctional properties to act as a base for several device engineering. Specifically, perovskites possess a great potential for chemical sensors with their semiconducting nature and ease to dope with other elements to further improve gas sensing properties. In this present study, a rare-earth gadolinium orthoferrite, GdFeO3 (GFO), and Co-doped GFO were systematically investigated by evaluating their structural, morphological, electrical, and gas sensing properties. A high-temperature solid-state reaction synthesized the phase-pure compounds. The magnetic properties of Co-doped GFO significantly improved than pure GFO. The pellet-type gas sensor was fabricated, which does not need any sophisticated instrumentation such as microfabrication. When exposed to 20 ppm of NO2 gas, a GdFe0.7Co0.3O3 (GFOC3) device gave 6.86% response at 200 = C, along with a response time of 104 s and the recovery time of 97 s. Additionally, Co-doped GFO sensors showed a detectable response even at room temperature, enabling- practical applications in an ambient environment. The gas sensor revealed stable gas response characteristics even after several months. Therefore, this study elucidates that the Co-doped GFO has better gas sensing performance compared to a bare GFO and that it is highly selective towards the NO2 gas. (c) 2021 The Korean Society of Industrial and Engineering Chemistry.
Gas sensorNitrogen dioxideImpedanceDielectricRare -earth orthoferriteLNFEO(3)SENSORS
NSTL
Elsevier
