Effect of Polymerization Temperatures on Polyaniline Coated Fiber Bragg Grating Sensor for Chloroform Detection

Ahad, Irma Zulayka Mohamad and Harun, Sulaiman Wadi and Gan, Seng Neon and Phang, Sook Wai (2018) Effect of Polymerization Temperatures on Polyaniline Coated Fiber Bragg Grating Sensor for Chloroform Detection. Macromolecular Symposia, 382 (1). p. 1800088. ISSN 1022-1360, DOI https://doi.org/10.1002/masy.201800088.

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Official URL: https://doi.org/10.1002/masy.201800088


A new fiber Bragg grating (FBG) sensor based on polyaniline (PAni) has been developed for chloroform detection. PAni was synthesized through chemical oxidation method by using equimolar amount of aniline monomer (Ani), dioctyl sodium sulfosuccinate dopant (AOT) at different three polymerization temperatures (−5, 0 and 25 °C). The chemical structure and conducting behavior of PAni were confirmed using Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and conductivity measurements. In this study, the FBG sensor was produced by removing the cladding layer and replaced with PAni coating. The immersion of sensor in varying concentration of chloroform (from 10 to 100 ppm) produced different Bragg wavelength shift at ∼1557 nm in the optical spectrum analyzer (OSA). The effect of PAni polymerized at different polymerization temperatures affect the sensor performance. It was found that the FBG sensor coated with PAni polymerized at 0 °C exhibited the highest sensitivity for chloroform detection and good recyclability up to 10 cycles with fast response time of 7 s and recovery time of 8 s. The FTIR, UV-vis and conductivity analyses supported the proposed mechanism for the interaction between PAni and chloroform being the dipole-dipole interaction (physical interaction) between the partial negative charge (Clδ−) of chloroform and the partial positive charge (NHδ+) of PAni.

Item Type: Article
Uncontrolled Keywords: Bragg wavelength shift; Chloroform; FBG; PAni; Polymerization temperatures
Subjects: Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Department of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Dec 2018 01:42
Last Modified: 27 Dec 2018 01:42
URI: http://eprints.um.edu.my/id/eprint/19816

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