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).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.