| Recent advances in ABO3 perovskites: their gas‑sensing performance as resistive‑type gas sensors |
Peresi Majura Bulemo1,2, Il‑Doo Kim1,3
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1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
2Department of Mechanical and Industrial Engineering, University of Dar es Salaam, P. O. Box 35131, Dar es Salaam, Tanzania
3Advanced Nanosensor Research Center, KI Nanocentury, KAIST, 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea |
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Received: August 7, 2019; Revised: October 4, 2019 Accepted: October 7, 2019. Published online: January 31, 2020. |
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| ABSTRACT |
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Perovskite-type oxides with general stoichiometry ABO3 (A is a lanthanide or alkali earth metal, and B is transition metal) constitute a rich material playground for application as resistive-type gas-sensing layers. Immense interest is triggered by, among other factors, stability of abundant elements (≈ 90% in the periodic table) in this stoichiometry, relatively easy tunability of structure and chemical composition, and their off-stoichiometry stability upon doping. Moreover, their capability to host cationic and abundant oxygen vacancies renders them with excellent electrical and redox properties, and synergistic functions that influence their performance. Herein, we present an overview of recent development in the use of ABO3 perovskites as resistive-type gas sensors, clearly elucidating current experimental strategies, and sensing mechanisms involved in realization of enhanced sensing performance. Finally, we provide a brief overview of limitations that hamper their potential utilization in gas sensors and suggest new pathways for novel applications of ABO3 materials. |
| Key words:
Perovskites · Sensors · Doping · Oxygen vacancies · Porosity |
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