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Vol. 93, Issue 6, June 2008, pp.103-113




Synthesis and Characterization of a Novel Ammonia Gas Sensor Based on PANI-PVA Blend Thin Films




*Department of chemistry, S.G.B. Amravati University, Amravati 444602 (M.S.) India

 1 Optoelectronics and Sensor research Laboratory, Department of physics Dr. Babasaheb Ambedkar,Marathwada University,Aurangabad 431004 (M.S.) India

 *E-mai: dharamdupare@yahoo.co.in   Tel.: 9890742262

  E-mail: mds_bamu@yahoo.co.in



Received: 6 May 2008   /Accepted: 24 June 2008   /Published: 30 June 2008


Abstract: The polyaniline - polyvinyl alcohol blend films were synthesized by oxidative polymerization using chemical synthesis route. The polyaniline films were  synthesized using optimized concentration of monomer aniline, hydrochloric acid as a dopant using ammonium peroxy-disulphate as a oxidant and insulating addative matrix polyvinyl alcohol on glass substrate for development of ammonia sensor. The formation of PANI- PVA blend films show good uniform surface morphology at 10c   temperature, maintained at constant temperature bath. The synthesized PANI-PVA blend thin films were characterized by analyzing UV-Visible and FTIR spectra. The SEM study ensures that the thin films are uniform and porous in nature. The I-V characterization shows ohmic behaviour and also determines conductivity of the films. The response time of PANI-PVA blend thin films show that excellent behavior for 50-800 ppm and higher range of ammonia gas. This study reveals that PANI-PVA blend thin films provide a polymer matrix with very good mechanical strength, environmental stability, uniformity in surface, porous morphology and high conductivity, which are suitable for ammonia gas sensing.


Keywords: Polymer blend, Thin film, Conducting polymer, Ammonia Gas sensor, Polyaniline, polyvinyl alcohol


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