Microstructure and Humidity-Sensitive Characteristics of α-Fe2O3 Ceramic Sensor |
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Authors: | Carlo Cantalini Mario Pelino |
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Affiliation: | Dipartimento di Chimica, Ingegneria Chimica e Materiali, Universitàde L'Aquila, L'Aquila, Italy |
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Abstract: | The microstructure and humidity-sensitive characteristics of α -Fe2O3 porous ceramic were investigated. Microporous α -Fe2O3 powders were obtained by controlling the topotactic decomposition reaction of α -FeOOH. Water vapor adsorption thermogravimetrical experiments were carried out in the relative humidity (rh) range 0% to 95% on the α -Fe2O3 powder and the 900°C sintered compact. The microstructure was investigated by SEM, TEM, Hg intrusion, and N2 adsorption porosimetry techniques. The humidity sensitivity was investigated by the impedance measurements technique in 0% to 95% rh on the compacts sintered at 50°C steps in the 850° to 1100°C range. Humidity response was found to be affected by the microstructure, i.e., the characteristics of the precursor powders and sintering temperatures. |
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Keywords: | humidity sensors hematite porous materials electrical properties |
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