1-5 NAPTHALENEDISULPHONIC ACID DOPED POLYPYRROLE THIN FILMS AS COATINGS TO OPTICAL FIBERS FOR ORGANOPHOSPHATE SENSING

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

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VOLUME 3 , ISSUE 2 (June 2010) > List of articles

1-5 NAPTHALENEDISULPHONIC ACID DOPED POLYPYRROLE THIN FILMS AS COATINGS TO OPTICAL FIBERS FOR ORGANOPHOSPHATE SENSING

Lalitkumar Bansal * / Mahmoud. A. El-Sherif / Lalitkumar Bansal * / Mahmoud. A. El-Sherif

Keywords : Conducting Polymer, Optical fiber Sensor, Polypyrrole, DMMP, Nerve agent, Evanacent wave sensing, chemo-chromic transducer.

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 3, Issue 2, Pages 230-252, DOI: https://doi.org/10.21307/ijssis-2017-390

License : (CC BY-NC-ND 4.0)

Published Online: 12-December-2017

ARTICLE

ABSTRACT

1-5 Napthalenedisulphonic acid (NDSA) doped polypyrrole thin films are prepared by chemical oxidation polymerization and applied as modified claddings to optical fibers for organophosphate (dimethyl-methyl phosphonate, DMMP) sensing. DMMP sensing takes place via intensity modulation in multimode fibers due to refractive index modulation in polypyrrole films due to DMMP adsorption. The polypyrrole films are characterized by FTIR and Raman spectroscopy. Ellipsometry and thin film transmission study is conducted to monitor refractive index modulation in polypyrrole thin films upon DMMP exposure. The developed fiber optic sensor shows a sensitivity of 134ppm towards DMMP. Influence of sensing element length, sensing element diameter and input light intensity on the sensor response is investigated. The selectivity, environmental and thermal stability issues are also addressed.

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