Nanocrystalline ZnO(Ga): Paramagnetic centers, surface acidity and gas sensor properties
| Autor: | Alexander Gaskov, Stuart Turner, Marina Rumyantseva, Artem M. Abakumov, Darya Filatova, Diana Grishina, Elizaveta A. Konstantinova, Nataliya N. Vorobyeva |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Physics Metals and Alloys Analytical chemistry Conductance chemistry.chemical_element Conductivity Condensed Matter Physics Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemistry Paramagnetism chemistry Materials Chemistry Electrical and Electronic Engineering Gallium Instrumentation |
| Zdroj: | Sensors and actuators : B : chemical |
| ISSN: | 0925-4005 |
| Popis: | Nanocrystalline ZnO and ZnO(Ga) samples with different gallium content were prepared by wet-chemical method. Introduction of gallium leads to the increase of amount of weak acid sites such as surface hydroxyl groups. Gas sensing properties toward 0.2–2 ppm H 2 S and NO 2 were studied at 100–450 °C by DC conductance measurements. The optimal temperature for gas sensing experiments was determined. Sensor signal toward H 2 S decreases with increase of Ga concentration. The dependence of ZnO(Ga) sensor signal to NO 2 on the gallium content has non-monotonous character, which correlates with the change of conductivity of the samples in air and concentration of paramagnetic donor states. |
| Databáze: | OpenAIRE |
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