Co+3 substituted gadolinium nano-orthoferrites for environmental monitoring: Synthesis, device fabrication, and detailed gas sensing performance

材料科学 兴奋剂 选择性 制作 纳米技术 气相 化学工程 光电子学 化学 催化作用 物理化学 病理 冶金 工程类 替代医学 医学 生物化学
作者
Kyung-Taek Lee,Sugato Hajra,Manisha Sahu,Yogendra Kumar Mishra,Hoe Joon Kim
出处
期刊:Journal of Industrial and Engineering Chemistry [Elsevier BV]
卷期号:106: 512-519 被引量:9
标识
DOI:10.1016/j.jiec.2021.11.030
摘要

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.
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