Iron Oxides Nanoparticles Langmuir-Schaeffer Multilayers for Chemoresistive Gas Sensing.
Lecture Notes in Electrical Engineering(2018)
摘要
Gas sensors based on mixtures of iron oxides nanoparticles (NPs) modified with Pd NPs at the different NPs Pd: Fe3O4/c-Fe2O3 proportions were prepared and characterized. Nanoparticles diameter was 6-7 nm. NPs films were deposited from the mixtures of Fe3O4/c-Fe2O3 and Pd NPs colloidal solutions by modified Langmuir-Schaeffer technique onto alumina substrates. Samples were composed from 4 Fe3O4/c-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/c-Fe2O3 sensors showed p-type gas response, higher conductance and higher conduction activation energies compared to pure Fe3O4/c-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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关键词
Iron oxides,Nanoparticles,Langmuir-Schaeffer,Gas sensor,Nearest Neighbor Hopping
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