Universiti Teknologi Malaysia Institutional Repository

The pH sensor based optical fiber coated with PAH/PAA

Yatim, K. M. and Krishnan, G. and Bakhtiar, H. and Daud, S. and Harun, S. W. (2019) The pH sensor based optical fiber coated with PAH/PAA. In: Photonics Meeting 2019, The 2nd Annual Conference and Workshop, 8-9 July 2019, Terengganu, Malaysia.


Official URL: http://www.dx.doi.org/10.1088/1742-6596/1371/1/012...


pH-sensitive optical fiber sensors were fabricated with layer-by-layer (LbL) method. Multiple layers of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) bilayers were coated on an unclad fiber to create the pH-sensitive region. The coating process was done using a coating system developed in this work. 10 to 40 bilayers of PAH/PAA were coated on the fiber core to evaluate its performance as pH sensor. The existences of coating on the fiber were verified with field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDX) analysis. It was shown that the fabricated sensor is pH sensitive and independent of variation in the refractive index of the surrounding. The best performance was obtained with 30 bilayers fiber sensor. The sensitivity and resolution of the sensor were 0.453 a.u/pH and 0.0022 pH units respectively. With the developed coating system, various physical and chemical sensors can be realized by varying the coating materials.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:coatings, energy dispersive spectroscopy, field emission microscopes
Subjects:Q Science > QC Physics
ID Code:91700
Deposited By: Narimah Nawil
Deposited On:27 Jul 2021 13:39
Last Modified:27 Jul 2021 13:39

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