Queralto, Albert ORCID: 0000-0001-9101-0033, Graf, David ORCID: 0000-0002-0504-8527, Frohnhoven, Robert, Fischer, Thomas, Vanrompay, Hans ORCID: 0000-0002-9303-815X, Bals, Sara ORCID: 0000-0002-4249-8017, Bartasyte, Ausrine and Mathur, Sanjay (2019). LaFeO3 Nanofibers for High Detection of Sulfur-Containing Gases. ACS Sustain. Chem. Eng., 7 (6). S. 6023 - 6042. WASHINGTON: AMER CHEMICAL SOC. ISSN 2168-0485

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Abstract

Lanthanum ferrite nanofibers were electrospun from a chemical sol and calcined at 600 degrees C to obtain singlephase LaFeO3 (LFO) perovskite. High-resolution transmission electron microscopy in conjunction with 3D tomographic analysis confirmed an interwoven network of hollow and porous (surface) LFO nanofibers. Owing to their high surface area and p-type behavior, the nanofiber meshes showed high chemoselectivity toward reducing toxic gases (SO2, H2S) that could be reproducibly detected at very low concentrations (<1 ppm), well below the threshold values for occupational safety and health. An increased sensitivity was observed in the temperature range of 150-300 degrees C with maximum sensor response at 250 degrees C. The surface reaction at the heterogeneous solid (LFO)/gas (SO2) interface that confirmed the formation of La-2(SO4)(3) was investigated by X-ray photoelectron spectroscopy. Moreover, the LFO fibers showed a high selectivity in the detection of oxidizing and reducing gases. Whereas superior detection of NH3 and H2S was measured, little response was observed for CO and NO2. Finally, the integration of nanowire meshes in commercial sensor platforms was successfully demonstrated.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Queralto, AlbertUNSPECIFIEDorcid.org/0000-0001-9101-0033UNSPECIFIED
Graf, DavidUNSPECIFIEDorcid.org/0000-0002-0504-8527UNSPECIFIED
Frohnhoven, RobertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fischer, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vanrompay, HansUNSPECIFIEDorcid.org/0000-0002-9303-815XUNSPECIFIED
Bals, SaraUNSPECIFIEDorcid.org/0000-0002-4249-8017UNSPECIFIED
Bartasyte, AusrineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, SanjayUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-153608
DOI: 10.1021/acssuschemeng.8b06132
Journal or Publication Title: ACS Sustain. Chem. Eng.
Volume: 7
Number: 6
Page Range: S. 6023 - 6042
Date: 2019
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 2168-0485
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SENSING PROPERTIES; SO2 GAS; GRAIN-SIZE; SENSORS; H2S; OXIDATION; FILMS; WO3; NANOSTRUCTURES; NANORODSMultiple languages
Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, ChemicalMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15360

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