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Journal of Engineering
Volume 2014, Article ID 925020, 8 pages
Research Article

Humidity Sensing Properties of Surface Modified Polyaniline Metal Oxide Composites

1Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu 641046, India
2Department of Physics, Vidyavahini College, SIT Extension, Tumkur, Karnataka 572102, India
3Department of Materials Science, Gulbarga University, Gulbarga, Karnataka 585106, India
4Department of Physics, GFGC Tumkur, Tumkur, Karnataka 572102, India
5Department of Physics, GFG Degree College, Shahabad, Gulbarga, Karnataka 585228, India
6Department of Physics, Maharani’s Science College, Palace Road, Bangalore, Karnataka 560 001, India

Received 7 May 2014; Revised 16 August 2014; Accepted 30 September 2014; Published 25 November 2014

Academic Editor: Sadhan C. Jana

Copyright © 2014 S. C. Nagaraju et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Polyaniline- (PANI) praseodymium Oxide (Pr2O3) composites have been synthesized by in situ polymerization method with different weight percentages. The synthesized composites have been characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The temperature dependent conductivity shows that the conductivity is due to the hopping of polarons and bipolarons. These composites show negative thermal coefficient (α) behavior as a function of temperature, which is characteristic behavior of semiconducting materials. Sensor studies have been carried out by two-probe method and found that the sensitivity increases with increase in % RH. It is noticed that stability increase is due to the presence of Pr2O3 in polyaniline up to 30 wt%. A fast recovery and response time along with high sensitivity make these composites suitable for humidity sensors.