Humidity Sensor Based Nanocomposite Material
Research Journal of Nanoscience and Nanotechnology,
2017, 7(1), 10-16.
Objective: The objective was to synthesize nanocrystalline zinc titanate (ZnTiO3) via a solid-state reaction method and studied for its sensing behavior to humidity. Variations of resistance with relative humidity have been observed. Methodology: The surface morphology and structure of the synthesized material were characterized by SEM and XRD analysis, respectively. The structural analysis confirmed the formation of ZnTiO3 having an average crystallite size ~71 nm with hexagonal structure at room temperature (21°C). Sensitivity of the sensing material as a function of time and concentration of the humidity was estimated. The sensitivity of the sensor at different temperatures has also been calculated. Results: The highest sensitivity observed at room temperature was 17.86 MΩ/%RH. The response and recovery times of sensing pellet were found ∼180 and ∼500 sec, respectively. The activation energy was calculated as 0.024 eV. Conclusion: These experimental results show that ZnTiO3 is a promising material for humidity sensor as comparable to previous reported materials.
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