We tried to fabricate WO_3 thin-film sensors using four kinds of WO_3 particles with very different crystalline morphologies (spherical, disk, cuboid, and hexagonal). Using highly dispersive suspensions prepared, WO_3 thin films of 1.5 - 3.0 μm in mean thickness were obtained by micro-injecting film formation method. NO_2 sensing properties of these thin-film sensors suggested that the sensitivity to NO_2 as well as the rate of response-recovery depended markedly on morphology and microstructure of the WO_3 crystals contained.
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