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

S. K. Shukla1,*, Vamakshi1, Minakshi1, Anand Bharadavaja1, Aparna Shekhar2 and Ashutosh Tiwari3,*

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

DOI: 10.5185/amlett.2012.5349

Publication Date (Web): Sep 16, 2012

E-mail: sarojshukla2003@yahoo.co.in and  ashutosh.tiwari@liu.se 

Abstract


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.

Keywords

ZnO/PANi nanocomposite, electrical properties, conduction mechanism, humidity sensing.

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