Highly Sensitive GO-ZnO Nanocomposite-Based Optical Fiber Relative Humidity Sensor

Simple and novel optical fiber relative humidity (RH) sensor employing graphene oxide and zinc oxide nanocomposite (GO-ZnO) immobilized thin nanostructured silica sensing film is developed. The main objective of this work is to enhance the sensitivity considerably while achieving linear response over an optimum dynamic range. Comprehensive analysis is carried out while investigating the response characteristics of the sensor experimentally. The proposed sensor is characterized by a significantly enhanced sensitivity of 33.6 mV/%RH while responding linearly over a dynamic range of 17%–91%RH. In addition, the sensor exhibits a high degree of reversibility, repeatability, stability, and fast response and recovery time.