Understanding the gas sensing properties of polypyrrole coated tin oxide nanofiber mats

Bagchi, Sudeshna and Ghanshyam, C. (2017) Understanding the gas sensing properties of polypyrrole coated tin oxide nanofiber mats. Journal of Physics D: Applied Physics, 50 (10). p. 105302. ISSN 0022-3727

Full text not available from this repository.
Official URL: http://iopscience.iop.org/article/10.1088/1361-646...


Tin oxide-polypyrrole composites have been widely studied for their enhanced sensing performance towards ammonia vapours, but further investigations are required for an understanding of the interaction mechanisms with different target analytes. In this work, polypyrrole coated tin oxide fibers have been synthesized using a two-step approach of electrospinning and vapour phase polymerization for the sensing of ammonia, ethanol, methanol, 2-propanol and acetone vapours. The resistance variation in the presence of these vapours of different nature and concentration is investigated for the determination of sensor response. A decrease in resistance occurred on interaction of tin oxide-polypyrrole with ammonia, as opposed to previous reported works. Partial reduction of polypyrrole due to interfacial interaction with tin oxide has been proposed to explain this behavior. High sensitivity of 7.45 is achieved for 1 ppm ammonia concentration. Furthermore, the sensor exhibited high sensitivity and a faster response towards ethanol vapours although methanol has the highest electron donating capability. The catalytic mechanism has been discussed to explain this interesting behavior. The results reveal that interaction between tin oxide and polypyrrole is crucial to control the predominant sensing mechanism.

Item Type: Article
Subjects: CSIO > Agri - Instrumentation
Divisions: Agri - Instrumentation
Depositing User: Ms. Jyotsana
Date Deposited: 23 Jan 2019 16:37
Last Modified: 23 Jan 2019 16:37
URI: http://csioir.csio.res.in/id/eprint/741

Actions (login required)

View Item View Item