Ion Beam Modified Conducting Polymer Composites: Material for Gas Sensing

A polyaniline based conducting composite was prepared by oxidative polymerisation of aniline in presence of polyvinylchloride (PVC) matrix. The coherent free standing thin films of the composite were prepared by solution casting method. The PVC-polyaniline composite (90:10) of thickness 40 μm was irradiated with 90 MeV C 5+ ions at different ion fluence ranging 5× 10 11 -5× 10 13 ions/cm 2 . The changes in resistance of pristine and irradiated composite in presence of ammonia gas were studied. A general decrease in surface resistance is observed upon irradiation. The sensitivity, response time and recovery time were studied as a function of ion fluence on exposing the sensor material to ammonia gas at ambient condition. It is observed that irradiated composite films are more sensitive and fast in response to ammonia gas. The preliminary results observed are encouraging.

[1]  R. Singh,et al.  Preparation and characterization of polymer composites of polyaniline with poly(vinyl chloride) and polystyrene , 2005 .

[2]  Manoj K. Ram,et al.  NO2 gas sensing based on ordered ultrathin films of conducting polymer and its nanocomposite , 2005 .

[3]  J. Schultze,et al.  Application potential of conducting polymers , 2005 .

[4]  M. Rodrigues,et al.  Synthesis and characterisation of high impact polystyrene/polyaniline composite membranes for electrodialysis , 2004 .

[5]  Sudha V. Bhoraskar,et al.  Humidity sensing with weak acid-doped polyaniline and its composites , 2003 .

[6]  O. Güven,et al.  Gamma and electron dose response of the electrical conductivity of polyaniline based polymer composites , 2003 .

[7]  Amit L. Sharma,et al.  Synthesis and study of conductivity behaviour of blended conducting polymer films irradiated with swift heavy ions of silicon , 2003 .

[8]  S. K. Dhawan,et al.  Electromagnetic shielding behaviour of conducting polyaniline composites , 2003 .

[9]  Marina Mastragostino,et al.  Conducting polymers as electrode materials in supercapacitors , 2002 .

[10]  S. Ponrathnam,et al.  Study of chemical, optical and thermal modifications induced by 100 MeV silicon ions in a polycarbonate film , 2002 .

[11]  A. De,et al.  Conducting polymer composites: novel materials for gas sensing , 2001 .

[12]  R. Chandra,et al.  Conducting polyaniline composite: a reusable sensor material for aqueous ammonia , 2001 .

[13]  G. Wolf,et al.  Modification and structuring of conducting polymer films on insulating substrates by ion beam treatment , 2000 .

[14]  V. Shrinet,et al.  Effect of ion irradiation on hydrogen gas sensitivity of polymer , 1999 .

[15]  Peter Alfred Payne,et al.  An intelligent gas sensing system , 1997 .

[16]  B. Remaki,et al.  Conductive polyethylene as sensitive layer for gas detection , 1995 .

[17]  M. Wan,et al.  Structure and electrical properties of the oriented polyaniline films , 1994 .

[18]  L. Toppare,et al.  Conducting polymers of aniline. II: A composite as a gas sensor , 1993 .

[19]  T. Hioki,et al.  Electrical and optical properties of ion‐irradiated organic polymer Kapton H , 1983 .