| Autor: |
Yadav, B. C.1 balchandrayadav@rediffmail.com, Singh, Monika1, Srivastava, Richa1, Dwivedi, C. D.1 |
| Předmět: |
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| Zdroj: |
International Journal of Green Nanotechnology (Taylor & Francis Ltd). Apr2011, Vol. 3 Issue 2, p98-108. 11p. 3 Black and White Photographs, 5 Graphs. |
| Abstrakt: |
This article reports the moisture-sensing behavior of a nanostructured La2O3 and La(OH)3. Pellets of this material were prepared and used as a sensing element after successive thermal annealing for 2 h at different temperatures of 200, 400, 600, and 800°C. After each annealing step, this sensing element was placed in a conductivity holder and exposed to humidity. Variations in resistance with relative humidity were recorded. The sensing material was characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). A close look of the scanning electron micrographs confirms that the sensing element annealed at 400°C was more porous and uniform than the other samples. The maximum average sensitivity obtained was 19 MΩ/% relative humidity (RH) and results were found to be reproducible. The crystallite size of the sensing material was found to be in the range of 30-140 nm. The mass loss of the sensing material at different temperatures was also studied. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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