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Polypyrrole Nanonetwork Embedded in Polyvinyl Alcohol as Ammonia Gas Sensor

Author Affiliations

  • 1Department of Physics, Gauhati University, Guwahati-781014, Assam, INDIA

Res.J.chem.sci., Volume 5, Issue (5), Pages 61-68, May,18 (2015)


Polypyrrole (PPy) is known for its wide variation of electrical property through doping (oxidation) and dedoping (reduction). This has been efficiently utilized for fabrication of gas sensors. PPy in its nano form is known to enhance this property even further. In this article we have presented ammonia sensing by PPy nano networks developed in polyvinyl alcohol (PVA) film. Prior to the gas sensing study, the composite films are characterized by FESEM, XRD, FTIR and current-voltage (I-V) characteristics. These confirm formation of network, evidence of presence of PPy and PPy-PVA cross linking and moderately high in-plane electrical conductivity with ohmic nature of I-V. Ammonia sensing using this template as chemiresistor shows appreciable change in sensitivity in moderately low response time with fair reversibility.


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