Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Queralto, Albert UNSPECIFIED orcid.org/0000-0001-9101-0033 UNSPECIFIED Graf, David UNSPECIFIED orcid.org/0000-0002-0504-8527 UNSPECIFIED Frohnhoven, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Vanrompay, Hans UNSPECIFIED orcid.org/0000-0002-9303-815X UNSPECIFIED Bals, Sara UNSPECIFIED orcid.org/0000-0002-4249-8017 UNSPECIFIED Bartasyte, Ausrine UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SENSING PROPERTIES; SO2 GAS; GRAIN-SIZE; SENSORS; H2S; OXIDATION; FILMS; WO3; NANOSTRUCTURES; NANORODS Multiple languages Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15360