Abstract
An attempt was made to use tin oxide whiskers as gas sensor materials. The whiskers were prepared mainly by oxidation of metallic tin at 1100 °C under low partial pressure of oxygen. The electrical conductance of the whisker sensors was relatively small, but they showed substantial changes in conductance when exposed to inflammable gases. The sensitivity was dependent on the whisker thickness; in general, the thinner the whisker, the higher the sensitivity. However, with whiskers thinner than about 5 μm the sensitivity decreased. Sb 5+ -doping and addition of Pd did not enhance the sensitivity. A mechanism of gas detection was proposed based on changes in a positively charged space layer near the surface.
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