Zirconium Oxide (ZrO2) was added to the host polymer matrix with CH3COONa salt in order to prepare NCP films using solution cast technique. The films annealed at 1000 and 1350 °C and the humidity sensing parameters were measured. The grain sizes of NCP films were 5.2 and 14.5 µm when sintered at 1000 and 1350 °C, separately. At the sintering temperature of 1000 °C, for 3h, the grain development was apparent. At the sintering temperature of 1350 °C for 5h, the grain size diminished from 2.53 to 10.9 µm with the expansion from 60 wt% of PVA. The relative humidity, the sensitivity which was absorbed in the films gradually increased up to 1.4 sintered at 1000 °C, whereas at 1350 °C, the sensitivity showed an abrupt change which was gradually increased up to 1.48.

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