Carbon Dioxide Sensor Mechanism of Porous Hydroxyapatite Ceramics |
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| Authors: | Masayuki Nagai Tatsuya Saeki Tadashi Nishino |
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| Affiliation: | Musashi Institute of Technology, Tamazutsumi, Setagaya-ku, Tokyo, 158 Japan, and Sekisui Plastic Company, Ltd., Morimoto-cho, Tenri-shi, Nara, 632 Japan |
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| Abstract: | Hydroxyapatite and Cl− -containing hydroxyapatite powders are prepared and characterized. Reversible substitution of CO2-3 for OH− at the surface is presumed to be responsible for the sensor function. The role of Cl−, which is necessary to realize the sensor function and is incorporated during soaking treatment, is considered as follows. It may reduce the strain caused by the incorporation of CO2-3 (which is larger than OH−), and, hence, promote the reversible substitution reaction. This behavior is presumed because Cl− -containing hydroxyapatite samples exhibit sensor characteristics typical of CO2 without any treatment. |
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| Keywords: | sensors hydroxyapatite porous materials modeling electrical properties |
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