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Anomalous gas sensing behaviors to reducing agents of hydrothermally grown α-Fe2O3 nanorods
SENSOR Lab., Department of Information Engineering, University of Brescia.
SENSOR Lab., Department of Information Engineering, University of Brescia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. SENSOR Lab., Department of Information Engineering, University of Brescia.ORCID iD: 0000-0001-7949-0935
Department of Mathematics and Physics, Catholic University of Sacred Heart.
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2018 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 273, p. 1237-1245Article in journal (Refereed) Published
Abstract [en]

α-Fe2O3 nanorods have been grown by hydrothermal method, dispersed in ethanol and drop casted on a pre-patterned alumina substrate with Pt electrodes. Their morphology, crystalline and electronic properties have been investigated by Scanning Electron Microscopy, Raman and X-ray Photoelectron Spectroscopies and X-ray Diffraction. The so-fabricated devices have been used for hydrogen gas sensing, showing their ability to detect H2 at operating temperatures > 200 °C, at relative humidity values comprised from 0% to 50%. The sensing behavior of α-Fe2O3 nanorods is compatible with an n to p conductivity transition when the operating temperature is increased up to 300 °C. Outstanding p-type hydrogen sensing performances of α-Fe2O3 have been observed and reported. Besides H2 detection, the α-Fe2O3 nanorods-based device is a good humidity sensor, at room temperature (n-type) and at 400 °C (p-type). CO and ethanol sensing performances have been investigated at different operating temperatures and relative humidity values. CO and ethanol anomalous acceptor-like behaviors at 200 °C in humid air has been explained by the interactions of these target gases with the water molecules adsorbed on the metal oxide surfaces. An explanation of the n–p behavior transition at T > 200 °C in terms of band bending is reported.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 273, p. 1237-1245
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-70265DOI: 10.1016/j.snb.2018.07.042Scopus ID: 2-s2.0-85049771394OAI: oai:DiVA.org:ltu-70265DiVA, id: diva2:1237230
Note

Validerad;2018;Nivå 2;2018-08-08 (andbra)

Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-08-08Bibliographically approved

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