NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2016, 7 (4), P. 732–739
Polyaniline-Titanium dioxide composite as humidity sensor at room temperature
S. Kotresh – Department of PG Studies and Research in Physics, Government Science College, Chitradurga 577501, India
Y. T. Ravikiran – Department of PG Studies and Research in Physics, Government Science College, Chitradurga 577501, India; ytrcta@gmail.com
H. G. Raj Prakash – Department of Physics, JNN College of Engineering, Shivamogga 577204, India
S. C. Vijaya Kumari – Department of Physics, SJM College of Arts, Science and Commerce, Chitradurga 577501, India
In the present work, Polyaniline (PANI) and Polyaniline-Titanium dioxide (PANI-TiO2) composite have been synthesized separately by chemical polymerization of aniline without/with TiO2. Characteristic absorption bands of PANI and TiO2 in the composite were confirmed by FTIR studies, indicating the interaction of PANI with TiO2. Comparative study of XRD patterns of PANI and the composite confirmed superficial deposition of PANI on TiO2 and the average size of the composite particle was found to be 25 nm. The aggregated granular porous morphology of the composite was confirmed by its SEM image. The composite’s sensing response to humidity at room temperature was tested and was found to be 84.21 % in the range 25 % – 95 % RH. The response and recovery time of the composite at 95 % RH were measured to be 60s and 100s respectively and its sensing stability over a period of one month was also confirmed.
Keywords: polyaniline composites, humidity sensor, sensitivity, stability.
PACS 81.07.Pr
DOI 10.17586/2220-8054-2016-7-4-732-739
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