Marine salinity sensing using long-period fiber gratings enabled by stimuli-responsive polyelectrolyte multilayers

Fan Yang, Svetlana Sukhishvili, Henry Du, Fei Tian

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A highly sensitive fiber-optic salinity sensor synergistically combining long-period gratings (LPG) and stimuli-responsive polyelectrolyte multilayers is demonstrated. The LPG coupled with LP0,10 cladding mode was coated with ionic-strength-responsive chitosan (CHI)/poly (acrylic acid) (PAA) polyelectrolyte multilayers via the layer-by-layer (LbL) assembly technique. This LbL-coated LPG was exposed to NaCl solutions with varying concentrations for salinity measurement. The LPG resonance wavelength underwent a change from red shift to blue shift at the salt concentration of 0.5 M over the 0.1–0.8 M range at pH 7.5. A significant blue shift with a sensing response of 36 nm/M was observed from 0.5 to 0.8 M, relevant to that of seawater. This sensitivity is one order of magnitude higher than that obtained using as fabricated LPG without the stimuli-responsive LbL multilayers as well as documented studies. The mechanism associated with the salinity response of the LbL multilayers is discussed.

Original languageEnglish
Pages (from-to)745-751
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume253
DOIs
StatePublished - 2017

Keywords

  • Fiber-optic sensors
  • Layer-by-layer assembly
  • Long period gratings
  • Polyelectrolytes
  • Salinity

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