Optimization of coating thickness on optical fiber via layer-by-layer technique for pH sensing application

Yatim, Khairiah Mohd and Johari, Abd Rahman and Krishnan, Ganesan and Bakhtiar, Hazri and Daud, Suzairi and Aziz, Muhammad Safwan Afwan and Harun, Sulaiman Wadi (2020) Optimization of coating thickness on optical fiber via layer-by-layer technique for pH sensing application. International Journal of Microwave and Optical Technology, 15 (4). pp. 399-406. ISSN 1553-0396,

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Official URL: https://www.ijmot.com/VOL-15-NO-4.aspx


Layer-by-layer (LbL) coating system developed capable to monitor the LbL coating process on optical fiber for sensor application in real-time basis. The objective was to determine the optimum number of bilayer coatings for best sensing performance. Multiple layers of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) were coated on the surface of optical fiber core to create pH sensitive coating. The real-time monitoring of absorbance spectrum during coating process from 0 to 50 bilayers of PAH/PAA were done. The existence of the coating on the fiber were verified using field emission scanning electron microscopy (FESEM) and energy dispersive x-ray spectroscopy (EDX). The monitoring results show that 30 bilayers of PAH/PAA coating has high absorbance of 0.87 OD. at 800 nm. The pH sensing performance of the fiber without PAH/PAA coating was compared with the 30 bilayers of PAH/PAA coated fiber. The best performance was obtained with 30 bilayers of PAH/PAA coated fiber with the sensitivity of 0.453 OD/pH and resolution of 0.0022 pH units. © 2020 IAMOT.

Item Type: Article
Funders: UTM-TDR fund with research grant vote number of 06G83
Uncontrolled Keywords: Layer-by-layer; Optical fiber; PAH/PAA bilayers; PH sensor
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Feb 2021 01:44
Last Modified: 26 Feb 2021 01:44
URI: http://eprints.um.edu.my/id/eprint/25766

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