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Vol. 139, No. 4, April 2012, pp. 122-132

 

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Development of Nanostructured Polypyrrole (PPy) Thin Film Sensor for NO2 Detection

 

1 M. A. Chougule, 2 Shashwati Sen, 1* V. B. Patil

1* Materials Research Laboratory, School of Physical Sciences, Solapur University,

Solapur -413255, (MS), India

2 Crystal Technology Section, Technical Physics Division, BARC, Mumbai

E-mail: drvbpatil@gmail.com

 

 

Received: 2012   /Accepted: 23 April 2012   /Published: 30 April 2012

 

Digital Sensors and Sensor Sysstems

 

Abstract: Polypyrrole (PPy) was synthesized by chemical oxidative polymerization technique using monomer pyrrole and ammonium persulphate as an oxidant in a ratio of 1:1. Polypyrrole was characterized by X ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infra red spectroscopy (FTIR), UV visible spectroscopy and electrical resistivity by four probe method. The XRD and SAED analysis showed that the polypyrrole is amorphous in nature. Field emission scanning electron microscopy showed formation of porous agglomerated granular structure with average grain size of 80-90 nm. HRTEM image confirms formation of nanostructured PPy. The FTIR spectra shows that the presence of all characteristics absorption peaks of polypyrrole that is, 926 cm−1 (=CH out-of-plane vibration), 1048 cm−1 (=CH in-plane vibration), 1210 cm−1 (NC stretch bending) and 1478 cm−1 (pyrrole ring vibration). UV visible study shows PPy films exhibit absorption peak at 446 nm (2.77 eV). These films were investigated for their sensing behavior towards NO2, H2S, NH3, C2H5OH and CH3OH gases at room temperature. It has been observed that these films are selective for NO2 gas, and the maximum sensitivity of 14 % (100 ppm NO2) with 78 % stability at room temperature was achieved. These studies show that polypyrrole films can be used as room temperature NO2 sensors.

 

Keywords: Polypyrrole, Chemical polymerization, XRD, SEM, FTIR, NO2 sensor.

 

 

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