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Iron Oxides Nanoparticles Langmuir-Schaeffer Multilayers for Chemoresistive Gas Sensing

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Sensors (CNS 2016)

Part of the book series: Lecture Notes in Electrical Engineering ((LNEE,volume 431))

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Abstract

Gas sensors based on mixtures of iron oxides nanoparticles (NPs) modified with Pd NPs at the different NPs Pd: Fe3O4/γ-Fe2O3 proportions were prepared and characterized. Nanoparticles diameter was 6–7 nm. NPs films were deposited from the mixtures of Fe3O4/γ-Fe2O3 and Pd NPs colloidal solutions by modified Langmuir-Schaeffer technique onto alumina substrates. Samples were composed from 4 Fe3O4/γ-Fe2O3 NP monolayers (MLs). Sensors were tested toward acetone vapors and NO2 at concentration range of 5–200 and 0.5–12 ppm respectively in dry air, and at different working temperatures. Pd-doped Fe3O4/γ-Fe2O3 sensors showed p-type gas response, higher conductance and higher conduction activation energies compared to pure Fe3O4/γ-Fe2O3 sensor that gives n-type gas response. Results were tentatively explained in terms of surface interactions with oxidizing and reducing species, and Nearest Neighbor Hopping conduction model (NNH).

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Capone, S. et al. (2018). Iron Oxides Nanoparticles Langmuir-Schaeffer Multilayers for Chemoresistive Gas Sensing. In: Andò, B., Baldini, F., Di Natale, C., Marrazza, G., Siciliano, P. (eds) Sensors. CNS 2016. Lecture Notes in Electrical Engineering, vol 431. Springer, Cham. https://doi.org/10.1007/978-3-319-55077-0_9

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  • DOI: https://doi.org/10.1007/978-3-319-55077-0_9

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