Graphene coated silica microfiber for highly sensitive magnesium sensor

Yasin, Moh and Irawati, Ninik and Isa, Naimah Mat and Harun, Sulaiman Wadi and Ahmad, Fauzan (2018) Graphene coated silica microfiber for highly sensitive magnesium sensor. Sensors and Actuators A: Physical, 273. pp. 67-71. ISSN 0924-4247, DOI

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A high sensitivity and simple magnesium sensor based on an silica optical microfiber coated with graphene for the detection of different concentrations of magnesium in de-ionized water is developed and demonstrated. The silica microfiber probe is fabricated by flame brushing technique and it has a waist diameter of 6 μm with tapering length of 3 cm. The microfiber is coated with graphene, which functions as a sensing layer using drop coating method. It is observed that the output power from the probe decreases as the magnesium concentration increases. Without the graphene coating, the sensor has a sensitivity of 12.1 dB/% with slope linearity of more than 98.31% and resolution of 0.0102%. However, the sensitivity of the sensor is significantly improved to 19.63 dBm/% with better slope linearity of 99.25% and resolution of 0.0038% as the graphene is coated onto the silica microfiber probe. The resonant peak also shifts to a longer wavelength as the concentration of magnesium solution increased.

Item Type: Article
Funders: Airlangga University Research Grant (Grant No.: 569/UN3/2017)
Uncontrolled Keywords: Silica microfiber; Magnesium sensor; Microfiber sensor; Fiber optic; Graphene; Carbon nanotubes
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 14 Feb 2019 03:48
Last Modified: 14 Feb 2019 03:48

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