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The present work reports the synthesis of nano size zinc oxide encapsulated polyanaline by wet-chemical method at ambient condition. The prepared composite was characterized by XRD, SEM, TGA and UV-Vis spectroscopy. The results revealed the formation of the crystalline homogenous ZnO centered composite with electrical conductance in the range of 10 -2 scm -1 and thermal stability up to 280 0 C. Further, electrical resistance of a ZnO/PANi film of ~200 nm thickness was monitored against humidity to use as humidity sensitive element. The observed sensing parameters were response time, 32 sec; and recovery time, 45 sec; sensor has exhibited better sensing characteristics than pure PANi and other reported humidity sensors. Copyright © 2012 VBRI Press.

Fabrication Of Electro-chemical Humidity Sensor Based On Zinc Oxide/polyaniline Nanocomposite