TiO₂/B₂O₃ thick film gas sensor for monitoring carbon monoxide at different operating temperatures

Abstract TiO2/B2O3 gas sensor was fabricated on alumina substrate using screen-printing technology with thickness of sensing film in between of 3 – 5 µm. The sensing film of gas sensor was prepared by mixing the TiO2/B2O3 with organic binder. The morphology and structural element of sensing film was characterized using FESEM and x-ray diffraction. The gas sensor was exposed to 100 – 1000 ppm of carbon monoxide at different operating temperatures such as 100°C, 150°C, 200°C and 250°C. The result showed that the gas sensor behaved as n-type gas sensor and exhibited good response to various concentration of carbon monoxide at different operating temperatures. It also was found that highest sensitivity was achieved at 250°C, while optimal operating temperature was occurred at 150°Cfor TiO2/B2O3 gas sensor to the carbon monoxide.