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Metal oxide sensors with active films from Fe2O3 and CoFe2O4 hexagonally assembled nanoparticle (NP) arrays were studied. NPs were synthesized by high-temperature solution phase reaction. Sensing NP layers were deposited by Langmuir–Blodgett (LB) technique. LB layers were characterized by XRD, SEM and magnetic measurements. NPs are monodomain and superparamagnetic at RT. Sensor active films are formed from 1 or 7 LB monolayers deposited on the alumina substrates equipped with heating meander and interdigitated contacts. LB layers were heat-treated or UV irradiated to remove the insulating surfactant. Sensing properties were studied in a test chamber containing reducing (CO) or oxidizing (NO2) gas in concentrations between 5 and 100 ppm in the mixture with dry air. Response current signal (Igas/Iair) vs. temperature and response vs. gas concentration calibration curves were …
Publication date: 
27 Jan 2012

S Luby, L Chitu, M Jergel, E Majkova, P Siffalovic, AP Caricato, A Luches, M Martino, R Rella, MG Manera

Biblio References: 
Volume: 86 Issue: 6 Pages: 590-593