Graphene coated silica microfiber for highly sensitive magnesium sensor

M. Yasin, N. Irawati, N. M. Isa, S. W. Harun, F. Ahmad

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)67-71
Number of pages5
JournalSensors and Actuators, A: Physical
Publication statusPublished - 15 Apr 2018


  • Carbon nanotubes
  • Fiber optic
  • Graphene
  • Magnesium sensor
  • Microfiber sensor
  • Silica microfiber


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