Application of graphene oxide based Microfiber-Knot resonator for relative humidity sensing

• Published in: Results in Physics
• Main Author: Azzuhri S.R.; Amiri I.S.; Zulkhairi A.S.; Salim M.A.M.; Razak M.Z.A.; Khyasudeen M.F.; Ahmad H.; Zakaria R.; Yupapin P.
• Format: Article
• Language: English
• Published: Elsevier B.V. 2018
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85047273520&doi=10.1016%2fj.rinp.2018.05.009&partnerID=40&md5=78abb9dd15dc465b51edec4b43e6759b
• ISSN: 22113797
• DOI: 10.1016/j.rinp.2018.05.009

A relative humidity (RH) sensor is proposed and demonstrated using a micro-knot resonator (MKR) enhanced with a layer graphene oxide (GO) coating. The MKR is fabricated by means of tapering a standard fiber, with the GO coating added by the drop-cast method. The proposed sensor is tested for an RH range of between 0% and 80% at 20% intervals, and the configurations with and without the GO coating achieve sensitivities of 0.0104 nm/% and 0.0095 nm/%, respectively. The MKR configuration without the GO coating has a linear response correlation coefficient of 0.9098 and a resolution of 0.1%, while the configuration with the GO coating has a linear response correlation coefficient of 0.9548 and a resolution of 0.096% which is better. The proposed sensor has multiple applications, especially in the area of climate and atmospheric measurement and monitoring. © 2018 The Authors