Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Vol. 137, Issue 2, February 2012, pp. 104-114
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Room Temperature Liquefied Petroleum Gas Sensing Polymer (n-polypyrrole/p-polyaniline) Based Heterojunction
S. V. Patil, P. R. Deshmukh, * C. D. Lokhande Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur - 416004 (M.S), India * Tel.: +91 231 2609225, fax: +91 231 2692333 E-mail: l_chandrakant@yahoo.com (Prof. C. D. Lokhande)
Received: 4 December 2011 /Accepted: 14 February 2012 /Published: 28 February 2012 |
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Abstract: In the present work, room temperature (300 K) liquefied petroleum gas (LPG) sensor based on n-polypyrrole/p-polyaniline (n-PPy/p-PANI) heterojunction has been fabricated using simple inexpensive electrodeposition method. The n-PPy/p-PANI heterojunction was fabricated by depositing polyaniline over predeposited polypyrrole thin film. The polypyrrole and polyaniline thin films were characterized for their structural and surface morphological properties and chemical properties. The Raman spectrum of polyaniline and polypyrrole thin films confirmed the formation of polyaniline and polypyrrole. The X-ray diffraction (XRD) studies revealed that polypyrrole and polyaniline films are amorphous. The n-PPy/p-PANI heterojunction showed selectivity towards LPG as compared to N2 and CO2. The room temperature maximum gas response of 33 % (± 3 %) was achieved upon exposure of LPG at 1040 ppm.
Keywords: Thin films, Chemical sensor, Polyaniline/polypyrrole, Heterojunction, LPG sensor
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