ZnO/PANi nanocomposite; electrical properties; conduction mechanism; humidity sensing.
1Bhaskaracharya College of Applied Sciences, University of Delhi, Delhi 10075, India
2Shivaji College, University of Delhi, Delhi, India
3Biosensors and Bioelectronics Centre, Institute of Physics, Chemistry and Biology, Linköping University, S-58183, Linköping, Sweden
Adv. Mater. Lett., 2012, Current Issue, 3 (5), pp 421-425
Publication Date (Web): Sep 16, 2012
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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 0C. 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.
ZnO/PANi nanocomposite, electrical properties, conduction mechanism, humidity sensing.