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Investigation of Relative Humidity Sensing Using Tapered No-Core Fiber Coated With Graphene Oxide Film

Lookup NU author(s): Dr Andrew Pike



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


A microfiber interferometer based on a single-mode tapered-no-core single-mode (STNCS) fiber structure coated with a thin layer of graphene oxide (GO) was proposed and demonstrated as a relative humidity (RH) sensor. The STNCS fiber structure has a strong evanescent field, which can sensitively response to changes in the surrounding refractive index. The moisture-sensitive material GO was used to form the film on the no-core fiber by a dip impregnation method. The effects of GO concentration and the tapered waist diameter on RH sensitivity were studied experimentally. The experimental results showed that a thinner waist diameter provides higher RH sensitivity. When the concentration of GO solution is 0.01 mg/mL, the STNCS fiber structure with a waist diameter of 2.9 μm performs better in RH sensing; a high sensitivity of 0.461 nm/%RH in the range of 40-98% was achieved. The sensor has good stability with wavelength fluctuations of ±0.009 nm and ±0.008 nm over 60 mins at RHs of 50% and 80%, respectively. The proposed fiber optic humidity sensor has a high sensitivity over a wide measurement range and offers good stability showing promising potential application in the field of RH sensing.

Publication metadata

Author(s): Yang H, Lie J, Liu B, Luo C, Yi Z, Ma L, Wan S, Pike AR, Fu YQ, Wu Q, He X

Publication type: Article

Publication status: Published

Journal: IEEE Access

Year: 2020

Volume: 8

Pages: 220755 - 220761

Print publication date: 07/12/2020

Online publication date: 07/12/2020

Acceptance date: 07/12/2020

Date deposited: 05/11/2021

ISSN (electronic): 2169-3536

Publisher: IEEE


DOI: 10.1109/ACCESS.2020.3041507


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