Abstract
The effect of large pores on electrical properties of SnO 2 gas sensors has been investigated. Large intergranular pores of 10–20 μm diameter were created in SnO 2 gas sensors by adding starch powder in concentrations from 0 to 15 wt.%. Addition of starch powder did not change sintering behavior and resultant microstructure except for the formation of large pores. Gas sensitivity increased with starch addition. This result was attributed to enhanced diffusion of gases into the bulk SnO 2 through the created large pores. Introduction of large pores in a bulk SnO 2 matrix by adding starch can be a simple and useful way of microstructure control and sensitivity enhancement.
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