Chemical Tuning versus Microstructure Features in Solid-State Gas Sensors: LaFe1-xGaxO3, a Case Study

Year: 2014

Authors: Natile M.M., Ponzoni A., Concina I., Glisenti A.

Autors Affiliation: CNR-IENI, INSTM-Padova, via F. Marzolo 1, 35131 Padova, Italy; Dipartimento di Scienze Chimiche, Università di Padova, via F. Marzolo 1, 35131 Padova, Italy; CNR-INO Sensor Laboratory, via Branze 45, 25123 Brescia, Italy; Department of Information Engineering, University of Brescia, via Valotti 9, 25133 Brescia, Italy

Abstract: A simple and cheap wet chemical approach is exploited to synthesize LaFe1-xGaxO3 (x = 0-1) crystalline perovskites. Ga doping level deeply influences not only the microstructure, but also the iron chemical features and consequently the responses to external chemicals. Sensitivity toward gases (NO2, CO, and ethanol), in fact, is driven by both Fe/Ga ratio and iron oxidation states, which are demonstrated playing a role much stronger than morphological parameters, such as grain size and specific surface area, usually dominating the performances of metal oxide based gas sensors. Results highlight that sensing behavior is tunable within a large extent by a simple and effective modulation of the chemical composition, obtaining sensitivities comparable with state of the art perovskite based gas sensors.


Volume: 26 (4)      Pages from: 1505  to: 1513

More Information: M.M.N. and A.G. warmly acknowledge Dr. A. Galenda (CNR-IENI, Padova) for his help in the synthesis. M.M.N. acknowledges Italian MIUR under the Projects FIRB RBPR05JH2P \”Rete ItalNanoNet\”, FIRB RBAP114AMK \”RINAME\”, and PRIN 20097 x 44S7\” \”Record\” for partial funding.
DOI: 10.1021/cm4018858

Citations: 50
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