Ultrasensitive LPFG corrosion sensor with Fe-C coating electroplated on a Gr/AgNW film

Chuanrui Guo, Liang Fan, Chenglin Wu, Genda Chen, Wei Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)334-342
Number of pages9
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 15 Mar 2019
Externally publishedYes


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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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