Vol. 113, Issue 2, February 2010, pp. 63-70

Ammonia Gas Sensing Characteristics of Chemically Synthesized Polyaniline Matrix

¹Ravindra G. BAVANE, ²Mahendra D. SHIRSAT, and ^*1Ashok M. MAHAJAN

¹ Department of Electronics, School of Physical Sciences,

 North Maharashtra University, Jalgaon, India-4252001

² Nanoscale Electronics Research Laboratory, Department of Physics,

Dr. Babasaheb Ambedkar Marathwada University, Aurangabad – 431 004 (MS) India

^*Tel.: +91-257-2257476, fax: +91-257-2258403

 E-mail: ammahajan@nmu.ac.in

Received: 27 January 2010   /Accepted: 19 February 2010   /Published: 26 February 2010

Abstract: In present investigations polyaniline matrix was synthesized by oxidative polymerization (chemically synthesized). The polyaniline matrix was prepared on Si- substrate. The active layer of PANI as a sensor was fabricated with the help of spin-coating technique. The structural insight into the synthesized polyaniline matrix was sought by Fourier Transform Infrared (FTIR) spectroscopy. The mechanism of formation of polyaniline was also confirmed by UV spectroscopy. The electrical conductivity was measured by four probe method at room temperature. Ammonia gas sensing characteristics of the synthesized polyaniline matrix was studied by measuring the change in electrical resistance on exposure to ammonia gas at different concentrations from 100 to 500 ppm. The polyaniline matrix exhibits excellent sensing behavior for ammonia gas.

Keywords: Polyaniline, Oxidative polymerization, Ammonia sensor, Matrix

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