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Proceedings Paper

Fibre optic chemical sensor based on graphene oxide-coated long period grating
Author(s): Chen Liu; Qi Cai; Zhongyuan Sun; Baojian Xu; Jianlong Zhao; Lin Zhang; Xianfeng Chen
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Paper Abstract

In this work, a graphene oxide-coated long period fibre grating (GO-LPG) is proposed for chemical sensing application. Graphene oxide (GO) has been deposited on the surface of long period grating to form a sensing layer which significantly enhances the interaction between LPG propagating light and the surrounding-medium. The sensing mechanism of GO-LPG relies on the change of grating resonance intensity against surrounding-medium refractive index (SRI). The proposed GO-LPG has been used to measure the concentrations of sugar aqueous solutions. The refractive index sensitivities with 99.5 dB/RIU in low refractive index region (1.33-1.35) and 320.6 dB/RIU in high index region (1.42-1.44) have been achieved, showing an enhancement by a factor of 3.2 and 6.8 for low and high index regions, respectively. The proposed GO-LPG can be further extended to the development of optical biochemical sensor with advantages of high sensitivity, real-time and label-free sensing.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160V (30 May 2016); doi: 10.1117/12.2235671
Show Author Affiliations
Chen Liu, Bangor Univ. (United Kingdom)
Qi Cai, Bangor Univ. (United Kingdom)
Shanghai Institute of Microsystem and Information Technology (China)
Zhongyuan Sun, Aston Univ. (United Kingdom)
Baojian Xu, Shanghai Institute of Microsystem and Information Technology (China)
Jianlong Zhao, Shanghai Institute of Microsystem and Information Technology (China)
Lin Zhang, Aston Univ. (United Kingdom)
Xianfeng Chen, Bangor Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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