Sub-ppm H_{2}S$ sensing by tubular ZnO-Co_{3}O_{4}$ nanofibers
| Autor: | A.S. Chizhov, N. O. Khmelevsky, S.A. Vladimirova, Alexander Gaskov, Vadim Platonov, Maria Batuk, Joke Hadermann, Marina Rumyantseva |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
Materials science Oxide chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry 01 natural sciences chemistry.chemical_compound X-ray photoelectron spectroscopy Materials Chemistry Electrical and Electronic Engineering High-resolution transmission electron microscopy Instrumentation Physics Doping Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemistry chemistry Chemical engineering Nanofiber 0210 nano-technology Cobalt Layer (electronics) |
| Zdroj: | Sensors and actuators : B : chemical |
| ISSN: | 0925-4005 |
| Popis: | Tubular ZnO – Co3O4 nanofibers were co-electrospun from polymer solution containing zinc and cobalt acetates. Phase composition, cobalt electronic state and element distribution in the fibers were investigated by XRD, SEM, HRTEM, HAADF-STEM with EDX mapping, and XPS. Bare ZnO has high selective sensitivity to NO and NO2, while ZnO-Co3O4 composites demonstrate selective sensitivity to H2S in dry and humid air. This effect is discussed in terms of transformation of cobalt oxides into cobalt sulfides and change in the acidity of ZnO oxide surface upon cobalt doping. Reduction in response and recovery time is attributed to the formation of a tubular structure facilitating gas transport through the sensitive layer. |
| Databáze: | OpenAIRE |
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