Relative humidity sensing using a PMMA doped Agarose gel microfiber

Irawati, Ninik and A. Rahman, Husna and Yasin, Moh and Askari, Shadi and Hamida, Belal Ahmed and Ahmad, Harith and W. Harun, Sulaiman (2017) Relative humidity sensing using a PMMA doped Agarose gel microfiber. Journal of Lightwave Technology, 35 (18). pp. 3940-3944. ISSN 0733-8724 E-ISSN 1558-2213

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Abstract

Humidity sensors rely on humidity-induced refractive index change in the sensing material despite the sensor configuration. Polymer-based microwires can absorb water vapor molecules and detect humidity changes without the need of further coating. However, the sensitivity-simplicity trade-off is still a challenge. Sophisticated coating methods, complex resonating structures and nano-structured films are reported as methods to enhance the device sensitivity. A simple technique, to build a high sensitivity RH sensor based on an agarose-doped Poly Methyl Methacrylate (PMMA) sensor head, is demonstrated. The waist diameter and uniform length of the PMMA doped agarose gel microfiber were measured to be 6 μm and 10 mm, respectively. The sensor can achieve power variation of up to 2.9μW in a wide relative humidity range (50-80%), and display linear response with a correlation coefficient of 98.29 %, sensitivity of 0.421 dB/%RH and resolution of 0.431%RH. This agarose-based optical sensor provides a beneficial complement to the existing electrical ones, and will promote the employment of agarose in chemical sensing techniques.

Item Type:	Article (Journal)
Additional Information:	7222/58263
Uncontrolled Keywords:	Microfiber, Agarose, Humidity Sensor
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK452 Electric apparatus and materials. Electric circuits. Electric networks
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User:	Belal Ahmed Hamida
Date Deposited:	06 Sep 2017 15:03
Last Modified:	31 Oct 2017 12:09
URI:	http://irep.iium.edu.my/id/eprint/58263

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