Abstract
Gas sensors have been fabricated by a mixture of , powder, and tetraethylorthosilicate. Their response to gas has been investigated. A five ppm gas concentration changes their resistivity to a value lower than that in air, even in the presence of other gases. By protecting the sensor surface with organic material, sensitivity and selectivity for gas has been achieved. The observed change in conductivity of these films upon exposure to gas in air has been explained on the basis of band theory of solids supported by our x‐ray diffraction data and I‐V characteristics.
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