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This paper presents an investigation on the sensitivity toward ethanol of a gas sensor based on TiO2 nanofibers deposited by electrospinning between interdigitated Pt electrodes. Morphological/structural characterizations by SEM/TEM show the formation of fibers, having a length up to hundreds of μm and and a diameter of about 60 nm, constituted of TiO2 nanograins in the brookite phase. The sensitivity was evaluated by measuring, under constant polarization, the electrical current of the oxide nanofibers network at different ethanol concentrations (50-100-150 ppm) and different operating temperatures (350, 400 and 450° C). The experimental results show that the response increases linearly with increasing both the ethanol concentrations and the operating temperature. In particular, the best performance of the device toward the ethanol sensing is obtained when it works at 450° C. An equivalent circuit, modelling the electrical behavior in relation with the material microstructure, was …
Publication date: 
30 Jul 2018
Biblio References: 
IEEE Sensors Journal