Abstract
Macroporous (mp-) oxide films (SnO2, WO3 and In2O3) were fabricated by a modified sol-gel technique employing polymethylmethacrylate (PMMA) microspheres as a template. NH3 responses of all the mp-oxide films prepared were much lower than those of reference (R-) oxide films fabricated by screen printing of the sol-gel driven powder, probably due to less reactivity of NH3 originating from their macroporous structure. On the other hand, mp-oxide films, especially mp-In2O3, showed much larger H2S response than R-oxide films. Furthermore, the addition of CuO was quite effective for improving the H2S response and the recovery speed of mp-In2O3.
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