Abstract
The electrical conduction mechanisms of three types, of films have been investigated in relation to humidity-electrical resistance characteristics and their variations with time. Type I film consisted of heat-treated methylphenyl silicone and SiO2. Type II film consisted of a heat-treated mixture of silicone, SiO2, and Na2CO3. Type III film was a heat-treated mixture of silicone, SiO2, and graphite. The dominant charge carriers for the surface electrical conduction were thought to be protons in type I, hydrated sodium ions in type II, and protons and electrons in type III, respectively. The electrical resistance of type I increases and that of type II decreased with time of exposure to the laboratory air. The time dependence of the humidity-resistance characteristic of type III was less than that of other two types. However, the humidity-sensitivity of type III was not very good.
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