Fabrication and Experimental Analysis of Reduced Graphene Oxide Coated Etched Fiber Bragg Grating Refractometric Sensor

This letter reports on an etched fiber Bragg grating (FBG) sensor, with particles of reduced graphene oxide (rGO) adhering to the sensor surface, having enhanced refractometric sensing abilities. Effectiveness of developed sensor is investigated with varying salinity, by monitoring the shift in resonant peak of reflection spectra of sensor with interrogator. The presence of rGO has not only reported a 135% increase in sensitivity but has also considerably increased its immunity to surrounding temperature variations. The maximum sensitivity of approximately 3.99 nm/RIU at 20 °C for 25% salt concentration (% w/w) with resolution of 3.51 × 10
³
is reported.