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Selective SO2 detection at low concentration by Ca substituted LaFeO3 chemiresistive gas sensor: A comparative study of LaFeO3 pellet vs thin film
Abstract
Abstract A comparative study of La1-xCaxFeO3 (0.4 ≤ x ≤ 0.8) pellets and La0.6Ca0.4FeO3 thin films for the selective detection of low concentration SO2 gas has been performed. The La0.6Ca0.4FeO3 thin films exhibited superior gas sensing performance than La1-xCaxFeO3 (0.4 ≤ x ≤ 0.8) pellets in terms of sensitivity, operating temperature, detection limit, response, and recovery time. The HRTEM images confirm the nanoparticle nature of the La1-xCaxFeO3 (0.4 ≤ x ≤ 0.8) samples. The material crystallizes in the orthorhombic crystal system with the Pbnm space group. Further, occupancy refinement of neutron diffraction data indicates the presence of oxygen vacancies which was also supported by XPS analysis. Among the various compositions of La1-xCaxFeO3 (0.4 ≤ x ≤ 0.8), the x = 0.4(La0.6Ca0.4FeO3) was found to exhibit the best gas sensing performance and chosen for thin film preparation. The gas sensing studies of thin films, prepared by the DC magnetron sputtering method, confirm the enhanced gas sensitivity towards 3 ppm SO2 gas at a low operating temperature of 120 °C. The selectivity studies show that La1-xCaxFeO3 (0.4 ≤ x ≤ 0.8) preferentially detects SO2 gas at the given operating condition over other gases such as CH4, CO2, and CO. The gas sensing mechanism and high sensitivity of the La1-xCaxFeO3 sensor towards the detection of SO2 gas were explained by DFT calculations which give evidence for the strong binding of SO2 molecules on the 121 surface of the sensor.
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“Furthermore, Aranthady et al. [107] found that the La 0.6 Ca 0.4 FeO 3 thin films, prepared by the magnetron sputtering method, exhibited enhanced gas sensitivity towards 3 ppm SO 2 gas at a low operating temperature of 120°C.”
From Design Strategies and Emerging Applications of Perovskite-Based Sensors (2025) · cites this paper as [107]
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Design Strategies and Emerging Applications of Perovskite-Based Sensors
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Metadata
- Authors
- Aranthady, C., Jangid, T., Gupta, K., Mishra, A. K., Kaushik, S. D., Siruguri, V., Rao, G. M., Shanbhag, G. V., & Sundaram, N. G.
- Affiliations
- Manipal Academy of Higher Education (IN)
- Indian Institute of Science Bangalore (IN)
- Indo Korea Science and Technology (IN)
- University of Petroleum and Energy Studies (IN)
- Bhabha Atomic Research Centre (IN)
- Poornaprajna Institute of Scientific Research (IN)
- Corresponding author
- Mishra, Abhishek Kumar
- Sundaram, Nalini G.
- ORCID
- Venue
- Sensors and Actuators B: Chemical
- Publisher
- Elsevier BV
- Published
- 2021-02
- Volume
- 329
- Pages
- 129211
- ISSN
- 0925-4005 (ISSN-L)
- OpenAlex
- W3104791791
- Cited by
- 75
- References
- 95
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 15 · 2023: 13 · 2022: 18 · 2021: 9
- FWCI
- 3.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- Locations
- Sensors and Actuators B Chemical (publishedVersion)
- Funders
- UGC-DAE program India
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Gas Sensing Nanomaterials and Sensors
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrical and Thermal Properties of Materials
- Keywords
- SO2 gas sensing, LaFeO3, calcium substitution, chemiresistive gas sensors, thin films, pellets, low-concentration gas detection, gas selectivity, oxygen vacancies, magnetron sputtering, gas sensing mechanism, orthorhombic perovskite
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
