title: Evaluation of co-polyaniline nanocomposite thin films as humidity sensor.
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).
authors.affiliation: Center for Sensor Studies, Department of Physics, University of Pune, Pune 411007, India.
authors.forename: Madhavi V
authors.initials: MV
authors.lastname: Fuke
authors.forename: Anu
authors.initials: A
authors.lastname: Vijayan
authors.forename: Milind
authors.initials: M
authors.lastname: Kulkarni
authors.forename: Ranjit
authors.initials: R
authors.lastname: Hawaldar
authors.forename: R C
authors.initials: RC
authors.lastname: Aiyer