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

Title
Co+3 substituted gadolinium nano-orthoferrites for environmental monitoring: Synthesis, device fabrication, and detailed gas sensing performance
Author(s)
Lee, KyungtaekHajra, SugatoSahu, ManishaMishra, Yogendra Kumar.Kim, Hoe Joon
Issued Date
2022-02
Citation
Journal of Industrial and Engineering Chemistry, v.106, pp.512 - 519
Type
Article
Author Keywords
DielectricGas sensorImpedanceNitrogen dioxideRare-earth orthoferrite
Keywords
LNFEO(3)SENSORS
ISSN
1226-086X
Abstract
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. © 2021 The Korean Society of Industrial and Engineering Chemistry
URI
http://hdl.handle.net/20.500.11750/15979
DOI
10.1016/j.jiec.2021.11.030
Publisher
한국공업화학회
Related Researcher
  • 김회준 Kim, Hoe Joon
  • Research Interests MEMS/NEMS; Micro/Nano Sensors; Piezoelectric Devices; Nanomaterials; Heat Transfer; Atomic Force Microscope
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Department of Robotics and Mechatronics Engineering Nano Materials and Devices Lab 1. Journal Articles

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