Application of Fiber Bragg Grating Sensor coated with Polyaniline as an optical Sensor for chloroform detection

Ahad, Irma Zulayka Mohamad and Harun, Sulaiman Wadi and Gan, Seng Neon and Phang, Sook Wai (2017) Application of Fiber Bragg Grating Sensor coated with Polyaniline as an optical Sensor for chloroform detection. Polymers and Polymer Composites, 25 (7). pp. 555-562. ISSN 0967-3911, DOI

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Fiber Bragg Grating (FBG) sensor coated with PAni was designed as a sensing device in chloroform detection. PAni thin film was synthesized through chemical oxidation method by using aniline (Ani) as a monomer, ammonium persulphate (APS) as an initiator and dioctyl sodium sulfosuccinate (AOT) as a dopant. The chemical structure of PAni thin film was confirmed by using Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectrometer. The conducting behaviour of PAni thin film (1.157 x 10-2 S/cm) was determined by using four-point probe measurement. In the optical sensor part, FBG was etched in hydrofluoric acid solution (48% HF) to remove the cladding layer on fiber before coated with PAni. The response of this sensor was monitored based on the different of Bragg wavelength shift at ∼1557 nm in an optical spectrum analyzer (OSA) detector. PAni-coated FBG significantly increased in the Bragg wavelength shift (sensitivity = 0.0009) compared with uncoated FBG (sensitivity = 0.0002). The interaction between PAni and chloroform was significantly confirmed by the "polaron peak ratio" (Pf/ Pi) and "quinoid and benzenoid peak ratio" (IQ/ IB) through UV-vis and FTIR spectroscopy analysis. In this study, FBG sensor coated with PAni thin film had been found as an efficient sensor in chloroform detection with fast response time (7 s).

Item Type: Article
Uncontrolled Keywords: Polyaniline; FBG; Chloroform; Bragg wavelength shift
Subjects: Q Science > QC Physics
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 03:39
Last Modified: 27 Dec 2018 03:39

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