Analysis of DC and AC properties of a humidity sensor based on polyaniline-chromium oxide composites

TitleAnalysis of DC and AC properties of a humidity sensor based on polyaniline-chromium oxide composites
Publication TypeJournal Article
Year of Publication2014
AuthorsSajjan, K.C.., A.S.. Roy, A.. Parveen, and S.. Khasim
JournalJournal of Materials Science: Materials in Electronics
Volume25
Issue3
Pagination1237 - 1243
Date Published2014
ISBN Number09574522 (ISSN)
Abstract

Polyaniline-Chromia (PANI-Cr 2 O 3 ) composites were synthesized by in situ polymerization. The prepared composites were characterized by scanning electron microscopy, X-ray diffraction and Fourier transforms infrared spectroscopy. The structural studies confirm the polymerization of aniline over Cr 2 O 3 particles which results into strong interaction between PANI and Cr 2 O 3 particles. Direct current conductivity of composites increases with increase in temperature. Among all composites, 30 wt% shows high conductivity. The humidity sensing mechanism of the PANI-Cr 2 O 3 composites is studied and change in its resistance with respect to percentage relative humidity ranging from 20 to 95 % is recorded. The humidity sensing studies shows that the change in the resistance is due to the uncurling of polymer chains by the absorption of water vapor which leads to increase in conduction paths. The results indicate better humidity sensing response by the addition of Cr 2 O 3 particles to PANI, among all the composites, 30 wt% composite shows higher sensitivity. © 2014 Springer Science+Business Media New York.

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84894667117&doi=10.1007%2fs10854-014-1715-7&partnerID=40&md5=02022e5c27c6835e375205a5a51d4880
Short TitleJ Mater Sci Mater Electron