Hydroxyapatite (HAp) is a nanoceramic material having high porosity and better thermal stability. The modified Hydroxyapatite (HAp) material, to be used as sensor, is prepared by blending different weight concentration of TiO2 in it. The phase purity and crystallinity for HAp, TiO2 and composites are determined by XRD. The TGA is carried out to show the thermal stability of the materials. FTIR is performed to confirm functional groups. Surface morphological studies are carried out by SEM. The sensitivity, often called as gas response, is determined by noting resistance change in air and in gas/vapors, at various temperatures in the range of 300C-3500C.The operating temperature of the sensor is determined by means of gas response at various temperatures. The study involves gas sensing parameters like gas response, response/recovery time, and saturation limit which provides assessment of sensor material for its device application. In order to improve the gas sensing properties, HAp is blended with TiO2 so as to sense ammonia vapors in meager quantities in the surrounding air. The results showed that, compared to commercial HAp, the sensitivities of the commercial TiO2 and composites are found to be more. Hence TiO2 blended HAp nanoceramic can be used as an ideal substrates for ammonia detection at lower concentration and at room temperature.
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2022: 6.012
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