Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 243, Issue -, Pages 895-903Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.027
Keywords
Iron oxide; Nanoparticles; Pd doping; Acetone; NO2; Gas sensing
Funding
- Slovak Grant Agency VEGA [2/0010/15]
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The functionalization of Fe3O4/gamma-Fe2O3 nanoparticles (NPs) gas sensors with Pd NPs was studied. NPs films were deposited from the mixtures of Fe3O4/gamma-Fe2O3 and Pd NPs colloidal solutions by modified Langmuir-Schaefer technique onto Al2O3 substrates, the NP size being 6-7 nm. Samples were composed from 4 Fe3O4/gamma-Fe2O3 NP monolayers (MLs), either pure or doped by Pd at the different NPs Pd: Fe3O4/gamma-Fe2O3 proportions. NPs and films were studied by DLS, GI XRD, SEM and EDS. Sensors were tested toward acetone vapors and NO2 at concentration range of 5-200 ppm and 0.5-12 ppm respectively in dry air and under working temperatures range 200-500 degrees C. Before testing 1 nm, surfactant capping was removed by UV irradiation. Pd-doped Fe3O4/,gamma-Fe2O3 sensors showed p-type gas response, higher conductance and higher conduction activation energies compared to pure Fe3O4/gamma-Fe2O3 sensor that gives n-type gas response. Results are explained in terms of surface interactions with oxidizing and reducing species, and electrical conduction mechanisms. (C) 2016 Elsevier B.V. All rights reserved.
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