Hydroxyapatite Nanoceramic Thick Film: An Efficient CO2 Gas Sensor

ABSTRACT

Hydroxyapatite (HAp) is widely used in biomedical applications due to its superb bioactive behavior. Moreover, it possesses potential applications in varied fields like chromatography, catalyst, fuel cell & chemical gas sensor. The hydroxyapatite thick films were deposited on insulating substrate using screen printing technique. The phase composition and particle morphology of the films were examined by means of X-ray diffraction and Scanning Electron Microscopy respectively. Energy Dispersive Spectroscopic study confirmed the elemental composition of the hydroxyapatite thick films. A systematic study on CO₂ gas sensing was carried out to determine operating temperature of hydroxyapatite thick film sensor. Effect of gas concentration on sensitivity factor and other parameters such as response and recovery time of HAp thick film for CO₂ were also investigated. The study revealed that HAp thick film is an excellent sensor for the detection of CO₂ gas at 165^o C which is relatively lower operating temperature as compared to CO₂ gas sensors available in the market today

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