Gas adsorption properties of titania nanoparticles coated piezoelectric quartz crystals

In this study, piezoelectric quartz crystals are used as a gas sensor to in vestigate the detecting properties of titania nanoparticles for carbon mono xide and nitrogen dioxide gases. Titania nanoparticles are deposited on the surface of a piezoelectric quartz crystal by a gas condensation method, It is found that the amount of frequency change is dependent on gas concentra tions at constant temperature. The amount of adsorbed carbon monoxide gas a t 150 degreesC hardly increases with increasing concentration, and the amou nt of adsorption is less than which at 200 degreesC The amount of adsorbed NO2 also indicates similar results. The amount of adsorbed CO at 200 degree sC is more than that of NO2. The results are obtained from this study withi n one or two order difference in comparison with results in literature.