Carbon Dioxide Sensor Mechanism of Porous Hydroxyapatite Ceramics

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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.