CeO2 activated ZnO-TiO2 thick film for CO2 gas sensor
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 8
Abstract
Nanocrystalline ZnO-TiO2 (molar ratio 9:1, 7:3, 1:1, 3:7 and 1:9) synthesized by hydrothermal method. The synthesized materials were used to prepare the thick films and gas sensing characteristics of prepared thick films for 286 ppm CO2 gas was investigated at different operating temperature. ZnO-TiO2 (3:7 molar ratio) thick film respond more to CO2 gas as compared to other investigated films. Further ZnO-TiO2 (molar ratio 3:7) thick film was activated by using 0.1M, 0.2M, 0.3M and 0.4M CeO2 solution. The sensing response of all CeO2 activated films to 286 ppm CO2 gas was studied at different operating temperature. It is found that 0.3M CeO2 activated ZnO-TiO2 thick film exhibited good response to CO2 gas at operating temperature 290 ◦C with quick response time (~ 24 s) and less recovery time (~ 72 s). Also film exhibited long time stability and repeatability. The experimental results indicate that the 0.3M CeO2 activated ZnO-TiO2 thick film is a very promising material that fulfils the practical requirements for the fabrication of CO2 gas sensors with good sensing characteristics.
Authors and Affiliations
R. B. Pedhekar, F. C. Raghuwanshi
Keywords
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