Abstract
gas sensors have been fabricated by the admixture of powders and alcohol, hydrophobic silica, or trimethylchlorosilane. Their responses to gas have been investigated. It is found that the resistivity of the sensor whose surface is covered by trimethyl‐silyl groups strongly depends on the gas concentration. A 10 ppm gas concentration changes its resistivity to a value 1000 times lower than that in air, in spite of there being small changes in the sensor resistivity in other reducing gases. By covering the sensor surface with organic materials, development of sensitivity and selectivity for gas has been achieved. Also, the mechanism of reaction between the organic materials on the surfaces of sensors and gas is discussed.
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