TY - JOUR
T1 - Marine salinity sensing using long-period fiber gratings enabled by stimuli-responsive polyelectrolyte multilayers
AU - Yang, Fan
AU - Sukhishvili, Svetlana
AU - Du, Henry
AU - Tian, Fei
N1 - Publisher Copyright:
© 2017
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Fiber-optic sensors
KW - Layer-by-layer assembly
KW - Long period gratings
KW - Polyelectrolytes
KW - Salinity
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U2 - 10.1016/j.snb.2017.06.121
DO - 10.1016/j.snb.2017.06.121
M3 - Article
AN - SCOPUS:85021892157
SN - 0925-4005
VL - 253
SP - 745
EP - 751
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
ER -