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Physical properties investigation and gas sensing mechanism of Al: Fe2O3 thin films deposited by spray pyrolysis

AuthorsBen Ayed, Rihab; Ajili, Mejda; García Martínez, Jorge Manuel ; Labidi, Ahmed; Turki, Najoua Kamoun
KeywordsIron oxide
Spray pyrolysis
Aluminum doping
Physical properties
Gas sensing
Issue DateMay-2019
PublisherElsevier BV
CitationSuperlattices and Microstructures 129: 91-104 (2019)
AbstractWe present the successful synthesis and characterization of pure and Al: Fe2O3 thin films prepared by spray pyrolysis. The XRD analysis showed a rhomboedric structure with (104) as a preferential orientation for all the layers. AFM and SEM observations exhibited a dense surface with grains uniformly distributed. Optical measurements demonstrated that Al: Fe2O3 (y = 6 and 8 at. %) were highly transparent. In addition, the band gaps values found in the range from 1.98 to 2.17 eV. Hall Effect measurements indicated an n-type conductivity with the lowest resistivity of 2.68 x 102 Ω.cm which reached for the 8 at. % Al: Fe2O3 thin films. Moreover, Al: Fe2O3 thin film based sensor demonstrated a good response to a small amount of ethanol vapor with the adequate response and recovery period at a low operating temperature equal to 250 °C.
Publisher version (URL)http://dx.doi.org/10.1016/j.spmi.2019.03.002
Identifiersdoi: 10.1016/j.spmi.2019.03.002
issn: 1096-3677
Appears in Collections:(CNM) Artículos
(IMN-CNM) Artículos
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