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Abstract
Spin coated films of Co-Polyaniline nanocomposite are evaluated for their transmission
properties using He-Ne laser for humidity sensing. The thickness (17-29 microm) of
the films is varied by multiple deposition of Co-Polyaniline nanocomposite on a glass
substrate. The samples exhibit typically two to three regions in their sensitivity
curve when tested in the relative humidity (RH) range of 20-95%. The sensitivity ranges
from 0.1 mV/%RH to 12.26 mV/%RH for lower to higher thickness. The sensors show quick
response of 8s (20-95%RH), and a recovery time of 1 min (95-20%RH) with good repeatability,
reproducibility and low hysteresis effect. The sensitivity of the sensor increases
with humidity and thickness. Material characterization is done by X-ray diffraction
(XRD), scanning electron micrograph (SEM) and Fourier transform infra-red spectroscopy
(FTIR).