Ultrasensitive LPFG Corrosion Sensor with Fe-C Coating Electroplated on a Gr/AgNW Film

Alternative Title

Ultrasensitive Corrosion Sensors with Gr/AgNW Electroplated Fe-C Coating on LPFG


This paper presents the first report on an ultrasensitive Fe-C coated long period fiber gratings (LPFG) corrosion sensor with graphene (Gr) and silver nanowire (AgNW) composite as a conductive film for Fe-C electroplating. The Gr/AgNW composite was grown on copper foil, wet transferred and adhered to the curve surface of the fiber optic sensor under atmospheric pressure and heating conditions. For comparison, another Fe-C coated LPFG sensor was prepared with silver nano ink as a conductive film. Both sensors were tested for 72 h in 3.5 wt.% NaCl solution with simultaneous measurements of transmission spectrum and electrochemical impedance spectroscopy. Due to its high optical transparency, the Gr/AgNW composite increased the wavelength sensitivity and service life of a Fe-C coated LPFG sensor by over 90% and 110%, respectively. The effective depth of influence to the evanescent field surrounding the LPFG sensor was 23.6 µm with the silver film and greater than 30 µm with the Gr/AgNW film.


Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Center for High Performance Computing Research


This work was supported by U.S. National Science Foundation (NSF) (CMMI-1235202) and the U.S. Department of Transportation (OST-R-69A3551747126).

Keywords and Phrases

Corrosion sensor; Fe-C coating; Graphene; Long period fiber gratings; Silver nanowire

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Document Type

Article - Journal

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© 2019 Elsevier B.V., All rights reserved.

Publication Date

01 Mar 2019