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Vol. 113, Issue 2, February 2010, pp. 82-94

 

Bullet

 

Synthesis of WO3-Polyaniline Composites and their Gas Sensing Properties

 

a*L. A. PATIL, bJ. P. TALEGAONKAR

a* Nanomaterials Research Lab., Dept. of Physics, Pratap College, Amalner, 425401, India

bSot. P. K. Kotecha Mahavidyalaya Bhusawal, 425201, India

* Tel: +919422767373

E-mail: plalchand_phy_aml@yahoo.co.in

 

 

Received: 8 October 2010   /Accepted: 19 February 2010   /Published: 26 February 2010

 

Abstract: Polyaniline (PANI) and WO3-PANI composites were synthesized by a chemical polymerization method using ammonium persulphate (APS) as an oxidizing agent. This is a single step polymerization process to synthesize the conducting polymer. Thick films of PANI and WO3-PANI were fabricated by screen-printing followed by firing at 300 0C for 30 min. WO3-PANI (50 wt%) thick films resulted in LPG gas detector. Upon exposure to 100 ppm LPG gas, the barrier height between the grains of WO3 and PANI decreases mark-ably leading to a drastic decrease in resistance. An exceptional sensitivity was found to LPG gas at 325 0C and no cross sensitivity was observed to other hazardous and polluting gases even at higher concentration (1000 ppm). The instant response (~ 14 s) and fast recovery (~ 38 s) are the main features of this sensor. XRD, SEM, E-DAX, FTIR and UV–Vis spectroscopy, characterized the synthesized polymers. The effects of microstructure and dopant concentrations on the gas response, selectivity, response time and recovery time of the sensor in the presence of LPG gas were studied and discussed.

 

Keywords: Polyaniline, Tungsten oxide, WO3-PANI composites, LPG sensor, Chemical polymerization

 

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